Merge tag 'tty-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial updates from Greg KH:
"Here is the "big" tty and serial driver patches for 5.5-rc1.

It's a bit later in the merge window than normal as I wanted to make
sure some last-minute patches applied to it were all sane. They seem
to be :)

There's a lot of little stuff in here, for the tty core, and for lots
of serial drivers:

- reverts of uartlite serial driver patches that were wrong

- msm-serial driver fixes

- serial core updates and fixes

- tty core fixes

- serial driver dma mapping api changes

- lots of other tiny fixes and updates for serial drivers

All of these have been in linux-next for a while with no reported
issues"

* tag 'tty-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (58 commits)
Revert "serial/8250: Add support for NI-Serial PXI/PXIe+485 devices"
vcs: prevent write access to vcsu devices
tty: vt: keyboard: reject invalid keycodes
tty: don't crash in tty_init_dev when missing tty_port
serial: stm32: fix clearing interrupt error flags
tty: Fix Kconfig indentation, continued
serial: serial_core: Perform NULL checks for break_ctl ops
tty: remove unused argument from tty_open_by_driver()
tty: Fix Kconfig indentation
{tty: serial, nand: onenand}: samsung: rename to fix build warning
serial: ifx6x60: add missed pm_runtime_disable
serial: pl011: Fix DMA ->flush_buffer()
Revert "serial-uartlite: Move the uart register"
Revert "serial-uartlite: Add get serial id if not provided"
Revert "serial-uartlite: Do not use static struct uart_driver out of probe()"
Revert "serial-uartlite: Add runtime support"
Revert "serial-uartlite: Change logic how console_port is setup"
Revert "serial-uartlite: Use allocated structure instead of static ones"
tty: serial: msm_serial: Use dma_request_chan() directly for channel request
tty: serial: tegra: Use dma_request_chan() directly for channel request
...

Documentation/ABI/stable/sysfs-driver-aspeed-vuart

···
 Users:		OpenBMC.  Proposed changes should be mailed to
 		[e-mail]
 
-What:		/sys/bus/platform/drivers/aspeed-vuart*/sirq
+What:		/sys/bus/platform/drivers/aspeed-vuart/*/sirq
 Date:		April 2017
 Contact:	Jeremy Kerr <[e-mail]>
 Description:	Configures which interrupt number the host side of
 		the UART will appear on the host <-> BMC LPC bus.
+Users:		OpenBMC.  Proposed changes should be mailed to
+		[e-mail]
+
+What:		/sys/bus/platform/drivers/aspeed-vuart/*/sirq_polarity
+Date:		July 2019
+Contact:	Oskar Senft <[e-mail]>
+Description:	Configures the polarity of the serial interrupt to the
+		host via the BMC LPC bus.
+		Set to 0 for active-low or 1 for active-high.
 Users:		OpenBMC.  Proposed changes should be mailed to
 		[e-mail]

Documentation/admin-guide/kernel-parameters.txt

···
 			mapped with the correct attributes.
 
 		linflex,<addr>
-			Use early console provided by Freescale LinFlex UART
+			Use early console provided by Freescale LINFlexD UART
 			serial driver for NXP S32V234 SoCs. A valid base
 			address must be provided, and the serial port must
 			already be setup and configured.

Documentation/devicetree/bindings/serial/8250.txt

···
 - {rts,cts,dtr,dsr,rng,dcd}-gpios: specify a GPIO for RTS/CTS/DTR/DSR/RI/DCD
   line respectively. It will use specified GPIO instead of the peripheral
   function pin for the UART feature. If unsure, don't specify this property.
+- aspeed,sirq-polarity-sense: Only applicable to aspeed,ast2500-vuart.
+  phandle to aspeed,ast2500-scu compatible syscon alongside register offset
+  and bit number to identify how the SIRQ polarity should be configured.
+  One possible data source is the LPC/eSPI mode bit.
+  Example: aspeed,sirq-polarity-sense = <&syscon 0x70 25>
 
 Note:
 * fsl,ns16550:

Documentation/devicetree/bindings/serial/fsl-lpuart.txt

···
 Optional properties:
 - dmas: A list of two dma specifiers, one for each entry in dma-names.
 - dma-names: should contain "tx" and "rx".
-- rs485-rts-delay, rs485-rts-active-low, rs485-rx-during-tx,
-  linux,rs485-enabled-at-boot-time: see rs485.txt
+- rs485-rts-active-low, linux,rs485-enabled-at-boot-time: see rs485.txt
 
 Note: Optional properties for DMA support. Write them both or both not.
 

Documentation/devicetree/bindings/serial/renesas,sci-serial.txt

···
     - "renesas,hscif-r8a7794" for R8A7794 (R-Car E2) HSCIF compatible UART.
     - "renesas,scif-r8a7795" for R8A7795 (R-Car H3) SCIF compatible UART.
     - "renesas,hscif-r8a7795" for R8A7795 (R-Car H3) HSCIF compatible UART.
-    - "renesas,scif-r8a7796" for R8A7796 (R-Car M3-W) SCIF compatible UART.
-    - "renesas,hscif-r8a7796" for R8A7796 (R-Car M3-W) HSCIF compatible UART.
+    - "renesas,scif-r8a7796" for R8A77960 (R-Car M3-W) SCIF compatible UART.
+    - "renesas,hscif-r8a7796" for R8A77960 (R-Car M3-W) HSCIF compatible UART.
+    - "renesas,scif-r8a77961" for R8A77961 (R-Car M3-W+) SCIF compatible UART.
+    - "renesas,hscif-r8a77961" for R8A77961 (R-Car M3-W+) HSCIF compatible UART.
     - "renesas,scif-r8a77965" for R8A77965 (R-Car M3-N) SCIF compatible UART.
     - "renesas,hscif-r8a77965" for R8A77965 (R-Car M3-N) HSCIF compatible UART.
     - "renesas,scif-r8a77970" for R8A77970 (R-Car V3M) SCIF compatible UART.

Documentation/process/magic-number.rst

···
 ISICOM_MAGIC          0x4d54           isi_port                 ``include/linux/isicom.h``
 PTY_MAGIC             0x5001                                    ``drivers/char/pty.c``
 PPP_MAGIC             0x5002           ppp                      ``include/linux/if_pppvar.h``
-SERIAL_MAGIC          0x5301           async_struct             ``include/linux/serial.h``
 SSTATE_MAGIC          0x5302           serial_state             ``include/linux/serial.h``
 SLIP_MAGIC            0x5302           slip                     ``drivers/net/slip.h``
 STRIP_MAGIC           0x5303           strip                    ``drivers/net/strip.c``

Documentation/translations/it_IT/process/magic-number.rst

···
 ISICOM_MAGIC          0x4d54           isi_port                 ``include/linux/isicom.h``
 PTY_MAGIC             0x5001                                    ``drivers/char/pty.c``
 PPP_MAGIC             0x5002           ppp                      ``include/linux/if_pppvar.h``
-SERIAL_MAGIC          0x5301           async_struct             ``include/linux/serial.h``
 SSTATE_MAGIC          0x5302           serial_state             ``include/linux/serial.h``
 SLIP_MAGIC            0x5302           slip                     ``drivers/net/slip.h``
 STRIP_MAGIC           0x5303           strip                    ``drivers/net/strip.c``

Documentation/translations/zh_CN/process/magic-number.rst

···
 ISICOM_MAGIC          0x4d54           isi_port                 ``include/linux/isicom.h``
 PTY_MAGIC             0x5001                                    ``drivers/char/pty.c``
 PPP_MAGIC             0x5002           ppp                      ``include/linux/if_pppvar.h``
-SERIAL_MAGIC          0x5301           async_struct             ``include/linux/serial.h``
 SSTATE_MAGIC          0x5302           serial_state             ``include/linux/serial.h``
 SLIP_MAGIC            0x5302           slip                     ``drivers/net/slip.h``
 STRIP_MAGIC           0x5303           strip                    ``drivers/net/strip.c``

arch/arm/boot/dts/aspeed-g5.dtsi

···
 				interrupts = <8>;
 				clocks = <&syscon ASPEED_CLK_APB>;
 				no-loopback-test;
+				aspeed,sirq-polarity-sense = <&syscon 0x70 25>;
 				status = "disabled";
 			};
 

drivers/mtd/nand/onenand/Makefile

···
 # Board specific.
 obj-$(CONFIG_MTD_ONENAND_GENERIC)	+= generic.o
 obj-$(CONFIG_MTD_ONENAND_OMAP2)		+= omap2.o
-obj-$(CONFIG_MTD_ONENAND_SAMSUNG)       += samsung.o
+obj-$(CONFIG_MTD_ONENAND_SAMSUNG)       += samsung_mtd.o
 
 onenand-objs = onenand_base.o onenand_bbt.o

drivers/net/wan/z85230.h

···
  *	Asynchronous Interfacing
  */
 
-#define SERIAL_MAGIC 0x5301
-
 /*
  * The size of the serial xmit buffer is 1 page, or 4096 bytes
  */

drivers/tty/Kconfig

···
 	default y
 
 config VT_HW_CONSOLE_BINDING
-       bool "Support for binding and unbinding console drivers"
-       depends on HW_CONSOLE
-       ---help---
-         The virtual terminal is the device that interacts with the physical
-         terminal through console drivers. On these systems, at least one
-         console driver is loaded. In other configurations, additional console
-         drivers may be enabled, such as the framebuffer console. If more than
-         1 console driver is enabled, setting this to 'y' will allow you to
-         select the console driver that will serve as the backend for the
-         virtual terminals.
+	bool "Support for binding and unbinding console drivers"
+	depends on HW_CONSOLE
+	---help---
+	  The virtual terminal is the device that interacts with the physical
+	  terminal through console drivers. On these systems, at least one
+	  console driver is loaded. In other configurations, additional console
+	  drivers may be enabled, such as the framebuffer console. If more than
+	  1 console driver is enabled, setting this to 'y' will allow you to
+	  select the console driver that will serve as the backend for the
+	  virtual terminals.
 
-	 See <file:Documentation/driver-api/console.rst> for more
-	 information. For framebuffer console users, please refer to
-	 <file:Documentation/fb/fbcon.rst>.
+	  See <file:Documentation/driver-api/console.rst> for more
+	  information. For framebuffer console users, please refer to
+	  <file:Documentation/fb/fbcon.rst>.
 
 config UNIX98_PTYS
 	bool "Unix98 PTY support" if EXPERT
···
 	depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI)
 	help
 	  This driver supports Comtrol RocketPort and RocketModem PCI boards.   
-          These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
-          modems.  For information about the RocketPort/RocketModem  boards
-          and this driver read <file:Documentation/driver-api/serial/rocket.rst>.
+	  These boards provide 2, 4, 8, 16, or 32 high-speed serial ports or
+	  modems.  For information about the RocketPort/RocketModem  boards
+	  and this driver read <file:Documentation/driver-api/serial/rocket.rst>.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called rocket.
 
 	  If you want to compile this driver into the kernel, say Y here.  If
-          you don't have a Comtrol RocketPort/RocketModem card installed, say N.
+	  you don't have a Comtrol RocketPort/RocketModem card installed, say N.
 
 config CYCLADES
 	tristate "Cyclades async mux support"
···
 	depends on MIPS_EJTAG_FDC_TTY && KGDB
 	default y
 	help
-          This enables the use of KGDB over an FDC channel, allowing KGDB to be
-          used remotely or when a serial port isn't available.
+	  This enables the use of KGDB over an FDC channel, allowing KGDB to be
+	  used remotely or when a serial port isn't available.
 
 config MIPS_EJTAG_FDC_KGDB_CHAN
 	int "KGDB FDC channel"

drivers/tty/amiserial.c

···
  *
  */
 
-/*
- * Serial driver configuration section.  Here are the various options:
- *
- * SERIAL_PARANOIA_CHECK
- * 		Check the magic number for the async_structure where
- * 		ever possible.
- */
-
 #include <linux/delay.h>
-
-#undef SERIAL_PARANOIA_CHECK
 
 /* Set of debugging defines */
 
···
 
 #define serial_isroot()	(capable(CAP_SYS_ADMIN))
 
-
-static inline int serial_paranoia_check(struct serial_state *info,
-					char *name, const char *routine)
-{
-#ifdef SERIAL_PARANOIA_CHECK
-	static const char *badmagic =
-		"Warning: bad magic number for serial struct (%s) in %s\n";
-	static const char *badinfo =
-		"Warning: null async_struct for (%s) in %s\n";
-
-	if (!info) {
-		printk(badinfo, name, routine);
-		return 1;
-	}
-	if (info->magic != SERIAL_MAGIC) {
-		printk(badmagic, name, routine);
-		return 1;
-	}
-#endif
-	return 0;
-}
-
 /* some serial hardware definitions */
 #define SDR_OVRUN   (1<<15)
 #define SDR_RBF     (1<<14)
···
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
 
-	if (serial_paranoia_check(info, tty->name, "rs_stop"))
-		return;
-
 	local_irq_save(flags);
 	if (info->IER & UART_IER_THRI) {
 		info->IER &= ~UART_IER_THRI;
···
 {
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_start"))
-		return;
 
 	local_irq_save(flags);
 	if (info->xmit.head != info->xmit.tail
···
 
 	info = tty->driver_data;
 
-	if (serial_paranoia_check(info, tty->name, "rs_put_char"))
-		return 0;
-
 	if (!info->xmit.buf)
 		return 0;
 
···
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
 
-	if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
-		return;
-
 	if (info->xmit.head == info->xmit.tail
 	    || tty->stopped
 	    || tty->hw_stopped
···
 	int	c, ret = 0;
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_write"))
-		return 0;
 
 	if (!info->xmit.buf)
 		return 0;
···
 {
 	struct serial_state *info = tty->driver_data;
 
-	if (serial_paranoia_check(info, tty->name, "rs_write_room"))
-		return 0;
 	return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 }
 
···
 {
 	struct serial_state *info = tty->driver_data;
 
-	if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
-		return 0;
 	return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
 }
 
···
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
 
-	if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
-		return;
 	local_irq_save(flags);
 	info->xmit.head = info->xmit.tail = 0;
 	local_irq_restore(flags);
···
 {
 	struct serial_state *info = tty->driver_data;
         unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_send_xchar"))
-		return;
 
 	info->x_char = ch;
 	if (ch) {
···
 	printk("throttle %s ....\n", tty_name(tty));
 #endif
 
-	if (serial_paranoia_check(info, tty->name, "rs_throttle"))
-		return;
-
 	if (I_IXOFF(tty))
 		rs_send_xchar(tty, STOP_CHAR(tty));
 
···
 #ifdef SERIAL_DEBUG_THROTTLE
 	printk("unthrottle %s ....\n", tty_name(tty));
 #endif
-
-	if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
-		return;
 
 	if (I_IXOFF(tty)) {
 		if (info->x_char)
···
 	unsigned char control, status;
 	unsigned long flags;
 
-	if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
-		return -ENODEV;
 	if (tty_io_error(tty))
 		return -EIO;
 
···
 	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
 
-	if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
-		return -ENODEV;
 	if (tty_io_error(tty))
 		return -EIO;
 
···
  */
 static int rs_break(struct tty_struct *tty, int break_state)
 {
-	struct serial_state *info = tty->driver_data;
 	unsigned long flags;
-
-	if (serial_paranoia_check(info, tty->name, "rs_break"))
-		return -EINVAL;
 
 	local_irq_save(flags);
 	if (break_state == -1)
···
 	unsigned long flags;
 	DEFINE_WAIT(wait);
 	int ret;
-
-	if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
-		return -ENODEV;
 
 	if ((cmd != TIOCSERCONFIG) &&
 	    (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
···
 	struct serial_state *state = tty->driver_data;
 	struct tty_port *port = &state->tport;
 
-	if (serial_paranoia_check(state, tty->name, "rs_close"))
-		return;
-
 	if (tty_port_close_start(port, tty, filp) == 0)
 		return;
 
···
 	struct serial_state *info = tty->driver_data;
 	unsigned long orig_jiffies, char_time;
 	int lsr;
-
-	if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
-		return;
 
 	if (info->xmit_fifo_size == 0)
 		return; /* Just in case.... */
···
 {
 	struct serial_state *info = tty->driver_data;
 
-	if (serial_paranoia_check(info, tty->name, "rs_hangup"))
-		return;
-
 	rs_flush_buffer(tty);
 	shutdown(tty, info);
 	info->tport.count = 0;
···
 	port->tty = tty;
 	tty->driver_data = info;
 	tty->port = port;
-	if (serial_paranoia_check(info, tty->name, "rs_open"))
-		return -ENODEV;
 
 	port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 

drivers/tty/hvc/Kconfig

···
 	  Xen driver for secondary virtual consoles
 
 config HVC_UDBG
-       bool "udbg based fake hypervisor console"
-       depends on PPC
-       select HVC_DRIVER
-       help
-         This is meant to be used during HW bring up or debugging when
-	 no other console mechanism exist but udbg, to get you a quick
-	 console for userspace. Do NOT enable in production kernels. 
+	bool "udbg based fake hypervisor console"
+	depends on PPC
+	select HVC_DRIVER
+	help
+	  This is meant to be used during HW bring up or debugging when
+	  no other console mechanism exist but udbg, to get you a quick
+	  console for userspace. Do NOT enable in production kernels.
 
 config HVC_DCC
-       bool "ARM JTAG DCC console"
-       depends on ARM || ARM64
-       select HVC_DRIVER
-       help
-         This console uses the JTAG DCC on ARM to create a console under the HVC
-	 driver. This console is used through a JTAG only on ARM. If you don't have
-	 a JTAG then you probably don't want this option.
+	bool "ARM JTAG DCC console"
+	depends on ARM || ARM64
+	select HVC_DRIVER
+	help
+	  This console uses the JTAG DCC on ARM to create a console under the HVC
+	  driver. This console is used through a JTAG only on ARM. If you don't have
+	  a JTAG then you probably don't want this option.
 
 config HVC_RISCV_SBI
 	bool "RISC-V SBI console support"

drivers/tty/hvc/hvc_dcc.c

···
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2010, 2014 The Linux Foundation. All rights reserved.  */
 
+#include <linux/console.h>
 #include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
 
 #include <asm/dcc.h>
 #include <asm/processor.h>
···
 /* DCC Status Bits */
 #define DCC_STATUS_RX		(1 << 30)
 #define DCC_STATUS_TX		(1 << 29)
+
+static void dcc_uart_console_putchar(struct uart_port *port, int ch)
+{
+	while (__dcc_getstatus() & DCC_STATUS_TX)
+		cpu_relax();
+
+	__dcc_putchar(ch);
+}
+
+static void dcc_early_write(struct console *con, const char *s, unsigned n)
+{
+	struct earlycon_device *dev = con->data;
+
+	uart_console_write(&dev->port, s, n, dcc_uart_console_putchar);
+}
+
+static int __init dcc_early_console_setup(struct earlycon_device *device,
+					  const char *opt)
+{
+	device->con->write = dcc_early_write;
+
+	return 0;
+}
+
+EARLYCON_DECLARE(dcc, dcc_early_console_setup);
 
 static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count)
 {

drivers/tty/rocket.c

···
  */
 static int get_ports(struct r_port *info, struct rocket_ports __user *retports)
 {
-	struct rocket_ports tmp;
-	int board;
+	struct rocket_ports *tmp;
+	int board, ret = 0;
 
-	memset(&tmp, 0, sizeof (tmp));
-	tmp.tty_major = rocket_driver->major;
+	tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	tmp->tty_major = rocket_driver->major;
 
 	for (board = 0; board < 4; board++) {
-		tmp.rocketModel[board].model = rocketModel[board].model;
-		strcpy(tmp.rocketModel[board].modelString, rocketModel[board].modelString);
-		tmp.rocketModel[board].numPorts = rocketModel[board].numPorts;
-		tmp.rocketModel[board].loadrm2 = rocketModel[board].loadrm2;
-		tmp.rocketModel[board].startingPortNumber = rocketModel[board].startingPortNumber;
+		tmp->rocketModel[board].model = rocketModel[board].model;
+		strcpy(tmp->rocketModel[board].modelString,
+		       rocketModel[board].modelString);
+		tmp->rocketModel[board].numPorts = rocketModel[board].numPorts;
+		tmp->rocketModel[board].loadrm2 = rocketModel[board].loadrm2;
+		tmp->rocketModel[board].startingPortNumber =
+			rocketModel[board].startingPortNumber;
 	}
-	if (copy_to_user(retports, &tmp, sizeof (*retports)))
-		return -EFAULT;
-	return 0;
+	if (copy_to_user(retports, tmp, sizeof(*retports)))
+		ret = -EFAULT;
+	kfree(tmp);
+	return ret;
 }
 
 static int reset_rm2(struct r_port *info, void __user *arg)

drivers/tty/serdev/core.c

···
 }
 
 #ifdef CONFIG_ACPI
-static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl,
-					    struct acpi_device *adev)
-{
-	struct serdev_device *serdev = NULL;
-	int err;
 
-	if (acpi_bus_get_status(adev) || !adev->status.present ||
-	    acpi_device_enumerated(adev))
-		return AE_OK;
+#define SERDEV_ACPI_MAX_SCAN_DEPTH 32
+
+struct acpi_serdev_lookup {
+	acpi_handle device_handle;
+	acpi_handle controller_handle;
+	int n;
+	int index;
+};
+
+static int acpi_serdev_parse_resource(struct acpi_resource *ares, void *data)
+{
+	struct acpi_serdev_lookup *lookup = data;
+	struct acpi_resource_uart_serialbus *sb;
+	acpi_status status;
+
+	if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
+		return 1;
+
+	if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
+		return 1;
+
+	if (lookup->index != -1 && lookup->n++ != lookup->index)
+		return 1;
+
+	sb = &ares->data.uart_serial_bus;
+
+	status = acpi_get_handle(lookup->device_handle,
+				 sb->resource_source.string_ptr,
+				 &lookup->controller_handle);
+	if (ACPI_FAILURE(status))
+		return 1;
+
+	/*
+	 * NOTE: Ideally, we would also want to retreive other properties here,
+	 * once setting them before opening the device is supported by serdev.
+	 */
+
+	return 1;
+}
+
+static int acpi_serdev_do_lookup(struct acpi_device *adev,
+                                 struct acpi_serdev_lookup *lookup)
+{
+	struct list_head resource_list;
+	int ret;
+
+	lookup->device_handle = acpi_device_handle(adev);
+	lookup->controller_handle = NULL;
+	lookup->n = 0;
+
+	INIT_LIST_HEAD(&resource_list);
+	ret = acpi_dev_get_resources(adev, &resource_list,
+				     acpi_serdev_parse_resource, lookup);
+	acpi_dev_free_resource_list(&resource_list);
+
+	if (ret < 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int acpi_serdev_check_resources(struct serdev_controller *ctrl,
+				       struct acpi_device *adev)
+{
+	struct acpi_serdev_lookup lookup;
+	int ret;
+
+	if (acpi_bus_get_status(adev) || !adev->status.present)
+		return -EINVAL;
+
+	/* Look for UARTSerialBusV2 resource */
+	lookup.index = -1;	// we only care for the last device
+
+	ret = acpi_serdev_do_lookup(adev, &lookup);
+	if (ret)
+		return ret;
+
+	/* Make sure controller and ResourceSource handle match */
+	if (ACPI_HANDLE(ctrl->dev.parent) != lookup.controller_handle)
+		return -ENODEV;
+
+	return 0;
+}
+
+static acpi_status acpi_serdev_register_device(struct serdev_controller *ctrl,
+					       struct acpi_device *adev)
+{
+	struct serdev_device *serdev;
+	int err;
 
 	serdev = serdev_device_alloc(ctrl);
 	if (!serdev) {
···
 }
 
 static acpi_status acpi_serdev_add_device(acpi_handle handle, u32 level,
-				       void *data, void **return_value)
+					  void *data, void **return_value)
 {
 	struct serdev_controller *ctrl = data;
 	struct acpi_device *adev;
···
 	if (acpi_bus_get_device(handle, &adev))
 		return AE_OK;
 
+	if (acpi_device_enumerated(adev))
+		return AE_OK;
+
+	if (acpi_serdev_check_resources(ctrl, adev))
+		return AE_OK;
+
 	return acpi_serdev_register_device(ctrl, adev);
 }
+
 
 static int acpi_serdev_register_devices(struct serdev_controller *ctrl)
 {
 	acpi_status status;
-	acpi_handle handle;
 
-	handle = ACPI_HANDLE(ctrl->dev.parent);
-	if (!handle)
+	if (!has_acpi_companion(ctrl->dev.parent))
 		return -ENODEV;
 
-	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
+	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
+				     SERDEV_ACPI_MAX_SCAN_DEPTH,
 				     acpi_serdev_add_device, NULL, ctrl, NULL);
 	if (ACPI_FAILURE(status))
-		dev_dbg(&ctrl->dev, "failed to enumerate serdev slaves\n");
+		dev_warn(&ctrl->dev, "failed to enumerate serdev slaves\n");
 
 	if (!ctrl->serdev)
 		return -ENODEV;

drivers/tty/serial/8250/8250_aspeed_vuart.c

···
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
 #include <linux/tty.h>
 #include <linux/tty_flip.h>
 #include <linux/clk.h>
···
 
 #define ASPEED_VUART_GCRA		0x20
 #define ASPEED_VUART_GCRA_VUART_EN		BIT(0)
+#define ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY	BIT(1)
 #define ASPEED_VUART_GCRA_DISABLE_HOST_TX_DISCARD BIT(5)
 #define ASPEED_VUART_GCRB		0x24
 #define ASPEED_VUART_GCRB_HOST_SIRQ_MASK	GENMASK(7, 4)
···
 
 static DEVICE_ATTR_RW(sirq);
 
+static ssize_t sirq_polarity_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct aspeed_vuart *vuart = dev_get_drvdata(dev);
+	u8 reg;
+
+	reg = readb(vuart->regs + ASPEED_VUART_GCRA);
+	reg &= ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY;
+
+	return snprintf(buf, PAGE_SIZE - 1, "%u\n", reg ? 1 : 0);
+}
+
+static void aspeed_vuart_set_sirq_polarity(struct aspeed_vuart *vuart,
+					   bool polarity)
+{
+	u8 reg = readb(vuart->regs + ASPEED_VUART_GCRA);
+
+	if (polarity)
+		reg |= ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY;
+	else
+		reg &= ~ASPEED_VUART_GCRA_HOST_SIRQ_POLARITY;
+
+	writeb(reg, vuart->regs + ASPEED_VUART_GCRA);
+}
+
+static ssize_t sirq_polarity_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t count)
+{
+	struct aspeed_vuart *vuart = dev_get_drvdata(dev);
+	unsigned long val;
+	int err;
+
+	err = kstrtoul(buf, 0, &val);
+	if (err)
+		return err;
+
+	aspeed_vuart_set_sirq_polarity(vuart, val != 0);
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(sirq_polarity);
+
 static struct attribute *aspeed_vuart_attrs[] = {
 	&dev_attr_sirq.attr,
+	&dev_attr_sirq_polarity.attr,
 	&dev_attr_lpc_address.attr,
 	NULL,
 };
···
 	return 1;
 }
 
+static void aspeed_vuart_auto_configure_sirq_polarity(
+	struct aspeed_vuart *vuart, struct device_node *syscon_np,
+	u32 reg_offset, u32 reg_mask)
+{
+	struct regmap *regmap;
+	u32 value;
+
+	regmap = syscon_node_to_regmap(syscon_np);
+	if (IS_ERR(regmap)) {
+		dev_warn(vuart->dev,
+			 "could not get regmap for aspeed,sirq-polarity-sense\n");
+		return;
+	}
+	if (regmap_read(regmap, reg_offset, &value)) {
+		dev_warn(vuart->dev, "could not read hw strap table\n");
+		return;
+	}
+
+	aspeed_vuart_set_sirq_polarity(vuart, (value & reg_mask) == 0);
+}
+
 static int aspeed_vuart_probe(struct platform_device *pdev)
 {
+	struct of_phandle_args sirq_polarity_sense_args;
 	struct uart_8250_port port;
 	struct aspeed_vuart *vuart;
 	struct device_node *np;
···
 		goto err_clk_disable;
 
 	vuart->line = rc;
+
+	rc = of_parse_phandle_with_fixed_args(
+		np, "aspeed,sirq-polarity-sense", 2, 0,
+		&sirq_polarity_sense_args);
+	if (rc < 0) {
+		dev_dbg(&pdev->dev,
+			"aspeed,sirq-polarity-sense property not found\n");
+	} else {
+		aspeed_vuart_auto_configure_sirq_polarity(
+			vuart, sirq_polarity_sense_args.np,
+			sirq_polarity_sense_args.args[0],
+			BIT(sirq_polarity_sense_args.args[1]));
+		of_node_put(sirq_polarity_sense_args.np);
+	}
 
 	aspeed_vuart_set_enabled(vuart, true);
 	aspeed_vuart_set_host_tx_discard(vuart, true);

drivers/tty/serial/8250/8250_dw.c

···
 	long rate;
 	int ret;
 
-	if (IS_ERR(d->clk))
-		goto out;
-
 	clk_disable_unprepare(d->clk);
 	rate = clk_round_rate(d->clk, baud * 16);
 	if (rate < 0)
···
 		ret = clk_set_rate(d->clk, rate);
 	clk_prepare_enable(d->clk);
 
-	if (!ret)
-		p->uartclk = rate;
+	if (ret)
+		goto out;
+
+	p->uartclk = rate;
 
 out:
 	p->status &= ~UPSTAT_AUTOCTS;
···
 {
 	struct uart_8250_port uart = {}, *up = &uart;
 	struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	int irq = platform_get_irq(pdev, 0);
 	struct uart_port *p = &up->port;
 	struct device *dev = &pdev->dev;
 	struct dw8250_data *data;
+	int irq;
 	int err;
 	u32 val;
 
···
 		return -EINVAL;
 	}
 
-	if (irq < 0) {
-		if (irq != -EPROBE_DEFER)
-			dev_err(dev, "cannot get irq\n");
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
 		return irq;
-	}
 
 	spin_lock_init(&p->lock);
 	p->mapbase	= regs->start;
···
 	device_property_read_u32(dev, "clock-frequency", &p->uartclk);
 
 	/* If there is separate baudclk, get the rate from it. */
-	data->clk = devm_clk_get(dev, "baudclk");
-	if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER)
-		data->clk = devm_clk_get(dev, NULL);
-	if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER)
-		return -EPROBE_DEFER;
-	if (!IS_ERR_OR_NULL(data->clk)) {
-		err = clk_prepare_enable(data->clk);
-		if (err)
-			dev_warn(dev, "could not enable optional baudclk: %d\n",
-				 err);
-		else
-			p->uartclk = clk_get_rate(data->clk);
-	}
+	data->clk = devm_clk_get_optional(dev, "baudclk");
+	if (data->clk == NULL)
+		data->clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(data->clk))
+		return PTR_ERR(data->clk);
+
+	err = clk_prepare_enable(data->clk);
+	if (err)
+		dev_warn(dev, "could not enable optional baudclk: %d\n", err);
+
+	if (data->clk)
+		p->uartclk = clk_get_rate(data->clk);
 
 	/* If no clock rate is defined, fail. */
 	if (!p->uartclk) {
···
 		goto err_clk;
 	}
 
-	data->pclk = devm_clk_get(dev, "apb_pclk");
-	if (IS_ERR(data->pclk) && PTR_ERR(data->pclk) == -EPROBE_DEFER) {
-		err = -EPROBE_DEFER;
+	data->pclk = devm_clk_get_optional(dev, "apb_pclk");
+	if (IS_ERR(data->pclk)) {
+		err = PTR_ERR(data->pclk);
 		goto err_clk;
 	}
-	if (!IS_ERR(data->pclk)) {
-		err = clk_prepare_enable(data->pclk);
-		if (err) {
-			dev_err(dev, "could not enable apb_pclk\n");
-			goto err_clk;
-		}
+
+	err = clk_prepare_enable(data->pclk);
+	if (err) {
+		dev_err(dev, "could not enable apb_pclk\n");
+		goto err_clk;
 	}
 
 	data->rst = devm_reset_control_get_optional_exclusive(dev, NULL);
···
 	reset_control_assert(data->rst);
 
 err_pclk:
-	if (!IS_ERR(data->pclk))
-		clk_disable_unprepare(data->pclk);
+	clk_disable_unprepare(data->pclk);
 
 err_clk:
-	if (!IS_ERR(data->clk))
-		clk_disable_unprepare(data->clk);
+	clk_disable_unprepare(data->clk);
 
 	return err;
 }
···
 
 	reset_control_assert(data->rst);
 
-	if (!IS_ERR(data->pclk))
-		clk_disable_unprepare(data->pclk);
+	clk_disable_unprepare(data->pclk);
 
-	if (!IS_ERR(data->clk))
-		clk_disable_unprepare(data->clk);
+	clk_disable_unprepare(data->clk);
 
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);
···
 {
 	struct dw8250_data *data = dev_get_drvdata(dev);
 
-	if (!IS_ERR(data->clk))
-		clk_disable_unprepare(data->clk);
+	clk_disable_unprepare(data->clk);
 
-	if (!IS_ERR(data->pclk))
-		clk_disable_unprepare(data->pclk);
+	clk_disable_unprepare(data->pclk);
 
 	return 0;
 }
···
 {
 	struct dw8250_data *data = dev_get_drvdata(dev);
 
-	if (!IS_ERR(data->pclk))
-		clk_prepare_enable(data->pclk);
+	clk_prepare_enable(data->pclk);
 
-	if (!IS_ERR(data->clk))
-		clk_prepare_enable(data->clk);
+	clk_prepare_enable(data->clk);
 
 	return 0;
 }

drivers/tty/serial/8250/8250_exar.c

···
 	serial_port_out(p, 0x2, quot_frac);
 }
 
+static int xr17v35x_startup(struct uart_port *port)
+{
+	/*
+	 * First enable access to IER [7:5], ISR [5:4], FCR [5:4],
+	 * MCR [7:5] and MSR [7:0]
+	 */
+	serial_port_out(port, UART_XR_EFR, UART_EFR_ECB);
+
+	/*
+	 * Make sure all interrups are masked until initialization is
+	 * complete and the FIFOs are cleared
+	 */
+	serial_port_out(port, UART_IER, 0);
+
+	return serial8250_do_startup(port);
+}
+
 static void exar_shutdown(struct uart_port *port)
 {
 	unsigned char lsr;
···
 
 		port->port.get_divisor = xr17v35x_get_divisor;
 		port->port.set_divisor = xr17v35x_set_divisor;
+
+		port->port.startup = xr17v35x_startup;
 	} else {
 		port->port.type = PORT_XR17D15X;
 	}

drivers/tty/serial/8250/8250_lpss.c

···
 
 static int qrk_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
 {
-	struct pci_dev *pdev = to_pci_dev(port->dev);
-	int ret;
-
-	pci_set_master(pdev);
-
-	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
-	if (ret < 0)
-		return ret;
-
-	port->irq = pci_irq_vector(pdev, 0);
-
 	qrk_serial_setup_dma(lpss, port);
 	return 0;
 }
···
 	if (ret)
 		return ret;
 
+	pci_set_master(pdev);
+
 	lpss = devm_kzalloc(&pdev->dev, sizeof(*lpss), GFP_KERNEL);
 	if (!lpss)
 		return -ENOMEM;
+
+	ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES);
+	if (ret < 0)
+		return ret;
 
 	lpss->board = (struct lpss8250_board *)id->driver_data;
 
 	memset(&uart, 0, sizeof(struct uart_8250_port));
 
 	uart.port.dev = &pdev->dev;
-	uart.port.irq = pdev->irq;
+	uart.port.irq = pci_irq_vector(pdev, 0);
 	uart.port.private_data = &lpss->data;
 	uart.port.type = PORT_16550A;
 	uart.port.iotype = UPIO_MEM;
···
 err_exit:
 	if (lpss->board->exit)
 		lpss->board->exit(lpss);
+	pci_free_irq_vectors(pdev);
 	return ret;
 }
 
···
 
 	if (lpss->board->exit)
 		lpss->board->exit(lpss);
+	pci_free_irq_vectors(pdev);
 }
 
 static const struct lpss8250_board byt_board = {

drivers/tty/serial/8250/8250_mtk.c

···
 	pm_runtime_set_active(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	data->rx_wakeup_irq = platform_get_irq(pdev, 1);
+	data->rx_wakeup_irq = platform_get_irq_optional(pdev, 1);
 
 	return 0;
 }

drivers/tty/serial/8250/8250_of.c

···
 }
 #endif
 
+static int of_8250_rs485_config(struct uart_port *port,
+				  struct serial_rs485 *rs485)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+
+	/* Clamp the delays to [0, 100ms] */
+	rs485->delay_rts_before_send = min(rs485->delay_rts_before_send, 100U);
+	rs485->delay_rts_after_send  = min(rs485->delay_rts_after_send, 100U);
+
+	port->rs485 = *rs485;
+
+	/*
+	 * Both serial8250_em485_init and serial8250_em485_destroy
+	 * are idempotent
+	 */
+	if (rs485->flags & SER_RS485_ENABLED) {
+		int ret = serial8250_em485_init(up);
+
+		if (ret) {
+			rs485->flags &= ~SER_RS485_ENABLED;
+			port->rs485.flags &= ~SER_RS485_ENABLED;
+		}
+		return ret;
+	}
+
+	serial8250_em485_destroy(up);
+
+	return 0;
+}
+
 /*
  * Fill a struct uart_port for a given device node
  */
···
 		port->flags |= UPF_SKIP_TEST;
 
 	port->dev = &ofdev->dev;
+	port->rs485_config = of_8250_rs485_config;
 
 	switch (type) {
 	case PORT_TEGRA:

drivers/tty/serial/8250/8250_pci.c

···
 }
 
 /* UART Port Control Register */
-#define NI16550_PCR_OFFSET	0x0f
-#define NI16550_PCR_RS422	0x00
-#define NI16550_PCR_ECHO_RS485	0x01
-#define NI16550_PCR_DTR_RS485	0x02
-#define NI16550_PCR_AUTO_RS485	0x03
-#define NI16550_PCR_WIRE_MODE_MASK	0x03
-#define NI16550_PCR_TXVR_ENABLE_BIT	BIT(3)
-#define NI16550_PCR_RS485_TERMINATION_BIT	BIT(6)
-#define NI16550_ACR_DTR_AUTO_DTR	(0x2 << 3)
-#define NI16550_ACR_DTR_MANUAL_DTR	(0x0 << 3)
+#define NI8430_PORTCON	0x0f
+#define NI8430_PORTCON_TXVR_ENABLE	(1 << 3)
 
 static int
 pci_ni8430_setup(struct serial_private *priv,
···
 		return -ENOMEM;
 
 	/* enable the transceiver */
-	writeb(readb(p + offset + NI16550_PCR_OFFSET) | NI16550_PCR_TXVR_ENABLE_BIT,
-	       p + offset + NI16550_PCR_OFFSET);
+	writeb(readb(p + offset + NI8430_PORTCON) | NI8430_PORTCON_TXVR_ENABLE,
+	       p + offset + NI8430_PORTCON);
 
 	iounmap(p);
 
 	return setup_port(priv, port, bar, offset, board->reg_shift);
-}
-
-static int pci_ni8431_config_rs485(struct uart_port *port,
-	struct serial_rs485 *rs485)
-{
-	u8 pcr, acr;
-	struct uart_8250_port *up;
-
-	up = container_of(port, struct uart_8250_port, port);
-	acr = up->acr;
-	pcr = port->serial_in(port, NI16550_PCR_OFFSET);
-	pcr &= ~NI16550_PCR_WIRE_MODE_MASK;
-
-	if (rs485->flags & SER_RS485_ENABLED) {
-		/* RS-485 */
-		if ((rs485->flags & SER_RS485_RX_DURING_TX) &&
-			(rs485->flags & SER_RS485_RTS_ON_SEND)) {
-			dev_dbg(port->dev, "Invalid 2-wire mode\n");
-			return -EINVAL;
-		}
-
-		if (rs485->flags & SER_RS485_RX_DURING_TX) {
-			/* Echo */
-			dev_vdbg(port->dev, "2-wire DTR with echo\n");
-			pcr |= NI16550_PCR_ECHO_RS485;
-			acr |= NI16550_ACR_DTR_MANUAL_DTR;
-		} else {
-			/* Auto or DTR */
-			if (rs485->flags & SER_RS485_RTS_ON_SEND) {
-				/* Auto */
-				dev_vdbg(port->dev, "2-wire Auto\n");
-				pcr |= NI16550_PCR_AUTO_RS485;
-				acr |= NI16550_ACR_DTR_AUTO_DTR;
-			} else {
-				/* DTR-controlled */
-				/* No Echo */
-				dev_vdbg(port->dev, "2-wire DTR no echo\n");
-				pcr |= NI16550_PCR_DTR_RS485;
-				acr |= NI16550_ACR_DTR_MANUAL_DTR;
-			}
-		}
-	} else {
-		/* RS-422 */
-		dev_vdbg(port->dev, "4-wire\n");
-		pcr |= NI16550_PCR_RS422;
-		acr |= NI16550_ACR_DTR_MANUAL_DTR;
-	}
-
-	dev_dbg(port->dev, "write pcr: 0x%08x\n", pcr);
-	port->serial_out(port, NI16550_PCR_OFFSET, pcr);
-
-	up->acr = acr;
-	port->serial_out(port, UART_SCR, UART_ACR);
-	port->serial_out(port, UART_ICR, up->acr);
-
-	/* Update the cache. */
-	port->rs485 = *rs485;
-
-	return 0;
-}
-
-static int pci_ni8431_setup(struct serial_private *priv,
-		 const struct pciserial_board *board,
-		 struct uart_8250_port *uart, int idx)
-{
-	u8 pcr, acr;
-	struct pci_dev *dev = priv->dev;
-	void __iomem *addr;
-	unsigned int bar, offset = board->first_offset;
-
-	if (idx >= board->num_ports)
-		return 1;
-
-	bar = FL_GET_BASE(board->flags);
-	offset += idx * board->uart_offset;
-
-	addr = pci_ioremap_bar(dev, bar);
-	if (!addr)
-		return -ENOMEM;
-
-	/* enable the transceiver */
-	writeb(readb(addr + NI16550_PCR_OFFSET) | NI16550_PCR_TXVR_ENABLE_BIT,
-		addr + NI16550_PCR_OFFSET);
-
-	pcr = readb(addr + NI16550_PCR_OFFSET);
-	pcr &= ~NI16550_PCR_WIRE_MODE_MASK;
-
-	/* set wire mode to default RS-422 */
-	pcr |= NI16550_PCR_RS422;
-	acr = NI16550_ACR_DTR_MANUAL_DTR;
-
-	/* write port configuration to register */
-	writeb(pcr, addr + NI16550_PCR_OFFSET);
-
-	/* access and write to UART acr register */
-	writeb(UART_ACR, addr + UART_SCR);
-	writeb(acr, addr + UART_ICR);
-
-	uart->port.rs485_config = &pci_ni8431_config_rs485;
-
-	iounmap(addr);
-
-	return setup_port(priv, uart, bar, offset, board->reg_shift);
 }
 
 static int pci_netmos_9900_setup(struct serial_private *priv,
···
 #define PCI_DEVICE_ID_ACCESIO_PCIE_COM_8SM	0x10E9
 #define PCI_DEVICE_ID_ACCESIO_PCIE_ICM_4SM	0x11D8
 
-#define PCIE_DEVICE_ID_NI_PXIE8430_2328	0x74C2
-#define PCIE_DEVICE_ID_NI_PXIE8430_23216	0x74C1
-#define PCI_DEVICE_ID_NI_PXI8431_4852	0x7081
-#define PCI_DEVICE_ID_NI_PXI8431_4854	0x70DE
-#define PCI_DEVICE_ID_NI_PXI8431_4858	0x70E3
-#define PCI_DEVICE_ID_NI_PXI8433_4852	0x70E9
-#define PCI_DEVICE_ID_NI_PXI8433_4854	0x70ED
-#define PCIE_DEVICE_ID_NI_PXIE8431_4858	0x74C4
-#define PCIE_DEVICE_ID_NI_PXIE8431_48516	0x74C3
 
 #define	PCI_DEVICE_ID_MOXA_CP102E	0x1024
 #define	PCI_DEVICE_ID_MOXA_CP102EL	0x1025
···
 		.subdevice	= PCI_ANY_ID,
 		.init		= pci_ni8430_init,
 		.setup		= pci_ni8430_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCIE_DEVICE_ID_NI_PXIE8430_2328,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8430_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCIE_DEVICE_ID_NI_PXIE8430_23216,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8430_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCI_DEVICE_ID_NI_PXI8431_4852,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8431_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCI_DEVICE_ID_NI_PXI8431_4854,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8431_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCI_DEVICE_ID_NI_PXI8431_4858,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8431_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCI_DEVICE_ID_NI_PXI8433_4852,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8431_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCI_DEVICE_ID_NI_PXI8433_4854,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8431_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCIE_DEVICE_ID_NI_PXIE8431_4858,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8431_setup,
-		.exit		= pci_ni8430_exit,
-	},
-	{
-		.vendor		= PCI_VENDOR_ID_NI,
-		.device		= PCIE_DEVICE_ID_NI_PXIE8431_48516,
-		.subvendor	= PCI_ANY_ID,
-		.subdevice	= PCI_ANY_ID,
-		.init		= pci_ni8430_init,
-		.setup		= pci_ni8431_setup,
 		.exit		= pci_ni8430_exit,
 	},
 	/* Quatech */
···
 	pbn_ni8430_4,
 	pbn_ni8430_8,
 	pbn_ni8430_16,
-	pbn_ni8430_pxie_8,
-	pbn_ni8430_pxie_16,
-	pbn_ni8431_2,
-	pbn_ni8431_4,
-	pbn_ni8431_8,
-	pbn_ni8431_pxie_8,
-	pbn_ni8431_pxie_16,
 	pbn_ADDIDATA_PCIe_1_3906250,
 	pbn_ADDIDATA_PCIe_2_3906250,
 	pbn_ADDIDATA_PCIe_4_3906250,
···
 		.flags		= FL_BASE0,
 		.num_ports	= 2,
 		.base_baud	= 3686400,
-		.uart_offset	= 0x10,
-		.first_offset	= 0x800,
-	},
-	[pbn_ni8430_pxie_16] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 16,
-		.base_baud	= 3125000,
-		.uart_offset	= 0x10,
-		.first_offset	= 0x800,
-	},
-	[pbn_ni8430_pxie_8] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 8,
-		.base_baud	= 3125000,
-		.uart_offset	= 0x10,
-		.first_offset	= 0x800,
-	},
-	[pbn_ni8431_8] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 8,
-		.base_baud	= 3686400,
-		.uart_offset	= 0x10,
-		.first_offset	= 0x800,
-	},
-	[pbn_ni8431_4] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 4,
-		.base_baud	= 3686400,
-		.uart_offset	= 0x10,
-		.first_offset	= 0x800,
-	},
-	[pbn_ni8431_2] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 2,
-		.base_baud	= 3686400,
-		.uart_offset	= 0x10,
-		.first_offset	= 0x800,
-	},
-	[pbn_ni8431_pxie_16] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 16,
-		.base_baud	= 3125000,
-		.uart_offset	= 0x10,
-		.first_offset	= 0x800,
-	},
-	[pbn_ni8431_pxie_8] = {
-		.flags		= FL_BASE0,
-		.num_ports	= 8,
-		.base_baud	= 3125000,
 		.uart_offset	= 0x10,
 		.first_offset	= 0x800,
 	},
···
 	{	PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI8432_2324,
 		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 		pbn_ni8430_4 },
-	{	PCI_VENDOR_ID_NI, PCIE_DEVICE_ID_NI_PXIE8430_2328,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8430_pxie_8 },
-	{	PCI_VENDOR_ID_NI, PCIE_DEVICE_ID_NI_PXIE8430_23216,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8430_pxie_16 },
-	{	PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8431_4852,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8431_2 },
-	{	PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8431_4854,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8431_4 },
-	{	PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8431_4858,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8431_8 },
-	{	PCI_VENDOR_ID_NI, PCIE_DEVICE_ID_NI_PXIE8431_4858,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8431_pxie_8 },
-	{	PCI_VENDOR_ID_NI, PCIE_DEVICE_ID_NI_PXIE8431_48516,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8431_pxie_16 },
-	{	PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8433_4852,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8431_2 },
-	{	PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI8433_4854,
-		PCI_ANY_ID, PCI_ANY_ID, 0, 0,
-		pbn_ni8431_4 },
 
 	/*
 	 * MOXA

drivers/tty/serial/8250/8250_port.c

···
 	enable_rsa(up);
 #endif
 
-	if (port->type == PORT_XR17V35X) {
-		/*
-		 * First enable access to IER [7:5], ISR [5:4], FCR [5:4],
-		 * MCR [7:5] and MSR [7:0]
-		 */
-		serial_port_out(port, UART_XR_EFR, UART_EFR_ECB);
-
-		/*
-		 * Make sure all interrups are masked until initialization is
-		 * complete and the FIFOs are cleared
-		 */
-		serial_port_out(port, UART_IER, 0);
-	}
-
 	/*
 	 * Clear the FIFO buffers and disable them.
 	 * (they will be reenabled in set_termios())

drivers/tty/serial/8250/Kconfig

···
 	tristate "Aspeed Virtual UART"
 	depends on SERIAL_8250
 	depends on OF
+	depends on REGMAP && MFD_SYSCON
 	help
 	  If you want to use the virtual UART (VUART) device on Aspeed
 	  BMC platforms, enable this option. This enables the 16550A-
···
 
 	  Features and limitations of the UART are
 	    Registers are similar to 16650 registers,
-              set bits in the control registers that are unsupported
+	      set bits in the control registers that are unsupported
 	      are ignored and read back as 0
 	    7/8 bit operation with 1 start and 1 stop bit
 	    8 symbols deep fifo for rx and tx

drivers/tty/serial/Kconfig

···
 	  boot time.)
 
 config SERIAL_SIRFSOC
-        tristate "SiRF SoC Platform Serial port support"
-        depends on ARCH_SIRF
-        select SERIAL_CORE
-        help
-          Support for the on-chip UART on the CSR SiRFprimaII series,
-          providing /dev/ttySiRF0, 1 and 2 (note, some machines may not
-          provide all of these ports, depending on how the serial port
-          pins are configured).
+	tristate "SiRF SoC Platform Serial port support"
+	depends on ARCH_SIRF
+	select SERIAL_CORE
+	help
+	  Support for the on-chip UART on the CSR SiRFprimaII series,
+	  providing /dev/ttySiRF0, 1 and 2 (note, some machines may not
+	  provide all of these ports, depending on how the serial port
+	  pins are configured).
 
 config SERIAL_SIRFSOC_CONSOLE
-        bool "Support for console on SiRF SoC serial port"
-        depends on SERIAL_SIRFSOC=y
-        select SERIAL_CORE_CONSOLE
-        help
-          Even if you say Y here, the currently visible virtual console
-          (/dev/tty0) will still be used as the system console by default, but
-          you can alter that using a kernel command line option such as
-          "console=ttySiRFx". (Try "man bootparam" or see the documentation of
-          your boot loader about how to pass options to the kernel at
-          boot time.)
+	bool "Support for console on SiRF SoC serial port"
+	depends on SERIAL_SIRFSOC=y
+	select SERIAL_CORE_CONSOLE
+	help
+	  Even if you say Y here, the currently visible virtual console
+	  (/dev/tty0) will still be used as the system console by default, but
+	  you can alter that using a kernel command line option such as
+	  "console=ttySiRFx". (Try "man bootparam" or see the documentation of
+	  your boot loader about how to pass options to the kernel at
+	  boot time.)
 
 config SERIAL_TEGRA
 	tristate "NVIDIA Tegra20/30 SoC serial controller"
···
 	  Support for console on SCCNXP serial ports.
 
 config SERIAL_SC16IS7XX_CORE
-        tristate
+	tristate
 
 config SERIAL_SC16IS7XX
-        tristate "SC16IS7xx serial support"
-        select SERIAL_CORE
-        depends on (SPI_MASTER && !I2C) || I2C
-        help
-          This selects support for SC16IS7xx serial ports.
-          Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752,
-          SC16IS760 and SC16IS762. Select supported buses using options below.
+	tristate "SC16IS7xx serial support"
+	select SERIAL_CORE
+	depends on (SPI_MASTER && !I2C) || I2C
+	help
+	  This selects support for SC16IS7xx serial ports.
+	  Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752,
+	  SC16IS760 and SC16IS762. Select supported buses using options below.
 
 config SERIAL_SC16IS7XX_I2C
-        bool "SC16IS7xx for I2C interface"
-        depends on SERIAL_SC16IS7XX
-        depends on I2C
-        select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
-        select REGMAP_I2C if I2C
-        default y
-        help
-          Enable SC16IS7xx driver on I2C bus,
-          If required say y, and say n to i2c if not required,
-          Enabled by default to support oldconfig.
-          You must select at least one bus for the driver to be built.
+	bool "SC16IS7xx for I2C interface"
+	depends on SERIAL_SC16IS7XX
+	depends on I2C
+	select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
+	select REGMAP_I2C if I2C
+	default y
+	help
+	  Enable SC16IS7xx driver on I2C bus,
+	  If required say y, and say n to i2c if not required,
+	  Enabled by default to support oldconfig.
+	  You must select at least one bus for the driver to be built.
 
 config SERIAL_SC16IS7XX_SPI
-        bool "SC16IS7xx for spi interface"
-        depends on SERIAL_SC16IS7XX
-        depends on SPI_MASTER
-        select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
-        select REGMAP_SPI if SPI_MASTER
-        help
-          Enable SC16IS7xx driver on SPI bus,
-          If required say y, and say n to spi if not required,
-          This is additional support to exsisting driver.
-          You must select at least one bus for the driver to be built.
+	bool "SC16IS7xx for spi interface"
+	depends on SERIAL_SC16IS7XX
+	depends on SPI_MASTER
+	select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
+	select REGMAP_SPI if SPI_MASTER
+	help
+	  Enable SC16IS7xx driver on SPI bus,
+	  If required say y, and say n to spi if not required,
+	  This is additional support to exsisting driver.
+	  You must select at least one bus for the driver to be built.
 
 config SERIAL_TIMBERDALE
 	tristate "Support for timberdale UART"
···
 	  Enable a Altera UART port to be the system console.
 
 config SERIAL_IFX6X60
-        tristate "SPI protocol driver for Infineon 6x60 modem (EXPERIMENTAL)"
+	tristate "SPI protocol driver for Infineon 6x60 modem (EXPERIMENTAL)"
 	depends on GPIOLIB || COMPILE_TEST
 	depends on SPI && HAS_DMA
 	help
···
 	  you can make it the console by answering Y to this option.
 
 config SERIAL_FSL_LINFLEXUART
-	tristate "Freescale linflexuart serial port support"
+	tristate "Freescale LINFlexD UART serial port support"
 	depends on PRINTK
 	select SERIAL_CORE
 	help
-	  Support for the on-chip linflexuart on some Freescale SOCs.
+	  Support for the on-chip LINFlexD UART on some Freescale SOCs.
 
 config SERIAL_FSL_LINFLEXUART_CONSOLE
-	bool "Console on Freescale linflexuart serial port"
+	bool "Console on Freescale LINFlexD UART serial port"
 	depends on SERIAL_FSL_LINFLEXUART=y
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 	help
-	  If you have enabled the linflexuart serial port on the Freescale
+	  If you have enabled the LINFlexD UART serial port on the Freescale
 	  SoCs, you can make it the console by answering Y to this option.
 
 config SERIAL_CONEXANT_DIGICOLOR

drivers/tty/serial/Makefile

···
 obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
 obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
 obj-$(CONFIG_SERIAL_BCM63XX) += bcm63xx_uart.o
-obj-$(CONFIG_SERIAL_SAMSUNG) += samsung.o
+obj-$(CONFIG_SERIAL_SAMSUNG) += samsung_tty.o
 obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
 obj-$(CONFIG_SERIAL_MAX310X) += max310x.o
 obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o

drivers/tty/serial/amba-pl011.c

···
 	dma_cap_mask_t mask;
 
 	uap->dma_probed = true;
-	chan = dma_request_slave_channel_reason(dev, "tx");
+	chan = dma_request_chan(dev, "tx");
 	if (IS_ERR(chan)) {
 		if (PTR_ERR(chan) == -EPROBE_DEFER) {
 			uap->dma_probed = false;
···
 	if (!uap->using_tx_dma)
 		return;
 
-	/* Avoid deadlock with the DMA engine callback */
-	spin_unlock(&uap->port.lock);
-	dmaengine_terminate_all(uap->dmatx.chan);
-	spin_lock(&uap->port.lock);
+	dmaengine_terminate_async(uap->dmatx.chan);
+
 	if (uap->dmatx.queued) {
 		dma_unmap_sg(uap->dmatx.chan->device->dev, &uap->dmatx.sg, 1,
 			     DMA_TO_DEVICE);
···
 
 #else
 /* Blank functions if the DMA engine is not available */
-static inline void pl011_dma_probe(struct uart_amba_port *uap)
-{
-}
-
 static inline void pl011_dma_remove(struct uart_amba_port *uap)
 {
 }

drivers/tty/serial/fsl_linflexuart.c

···
 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
- * Freescale linflexuart serial port driver
+ * Freescale LINFlexD UART serial port driver
  *
  * Copyright 2012-2016 Freescale Semiconductor, Inc.
  * Copyright 2017-2019 NXP
···
 module_init(linflex_serial_init);
 module_exit(linflex_serial_exit);
 
-MODULE_DESCRIPTION("Freescale linflex serial port driver");
+MODULE_DESCRIPTION("Freescale LINFlexD serial port driver");
 MODULE_LICENSE("GPL v2");

drivers/tty/serial/fsl_lpuart.c

···
 	}
 
 	sport->dma_tx_desc = dmaengine_prep_slave_sg(sport->dma_tx_chan, sgl,
-					sport->dma_tx_nents,
-					DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
+					ret, DMA_MEM_TO_DEV,
+					DMA_PREP_INTERRUPT);
 	if (!sport->dma_tx_desc) {
 		dma_unmap_sg(dev, sgl, sport->dma_tx_nents, DMA_TO_DEVICE);
 		dev_err(dev, "Cannot prepare TX slave DMA!\n");
···
 	return 0;
 }
 
+static int lpuart32_config_rs485(struct uart_port *port,
+			struct serial_rs485 *rs485)
+{
+	struct lpuart_port *sport = container_of(port,
+			struct lpuart_port, port);
+
+	unsigned long modem = lpuart32_read(&sport->port, UARTMODIR)
+				& ~(UARTMODEM_TXRTSPOL | UARTMODEM_TXRTSE);
+	lpuart32_write(&sport->port, modem, UARTMODIR);
+
+	/* clear unsupported configurations */
+	rs485->delay_rts_before_send = 0;
+	rs485->delay_rts_after_send = 0;
+	rs485->flags &= ~SER_RS485_RX_DURING_TX;
+
+	if (rs485->flags & SER_RS485_ENABLED) {
+		/* Enable auto RS-485 RTS mode */
+		modem |= UARTMODEM_TXRTSE;
+
+		/*
+		 * RTS needs to be logic HIGH either during transer _or_ after
+		 * transfer, other variants are not supported by the hardware.
+		 */
+
+		if (!(rs485->flags & (SER_RS485_RTS_ON_SEND |
+				SER_RS485_RTS_AFTER_SEND)))
+			rs485->flags |= SER_RS485_RTS_ON_SEND;
+
+		if (rs485->flags & SER_RS485_RTS_ON_SEND &&
+				rs485->flags & SER_RS485_RTS_AFTER_SEND)
+			rs485->flags &= ~SER_RS485_RTS_AFTER_SEND;
+
+		/*
+		 * The hardware defaults to RTS logic HIGH while transfer.
+		 * Switch polarity in case RTS shall be logic HIGH
+		 * after transfer.
+		 * Note: UART is assumed to be active high.
+		 */
+		if (rs485->flags & SER_RS485_RTS_ON_SEND)
+			modem &= ~UARTMODEM_TXRTSPOL;
+		else if (rs485->flags & SER_RS485_RTS_AFTER_SEND)
+			modem |= UARTMODEM_TXRTSPOL;
+	}
+
+	/* Store the new configuration */
+	sport->port.rs485 = *rs485;
+
+	lpuart32_write(&sport->port, modem, UARTMODIR);
+	return 0;
+}
+
 static unsigned int lpuart_get_mctrl(struct uart_port *port)
 {
 	unsigned int temp = 0;
···
 
 static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl)
 {
-	unsigned long temp;
 
-	temp = lpuart32_read(port, UARTMODIR) &
-			~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
-
-	if (mctrl & TIOCM_RTS)
-		temp |= UARTMODIR_RXRTSE;
-
-	if (mctrl & TIOCM_CTS)
-		temp |= UARTMODIR_TXCTSE;
-
-	lpuart32_write(port, temp, UARTMODIR);
 }
 
 static void lpuart_break_ctl(struct uart_port *port, int break_state)
···
 		ctrl |= UARTCTRL_M;
 	}
 
+	/*
+	 * When auto RS-485 RTS mode is enabled,
+	 * hardware flow control need to be disabled.
+	 */
+	if (sport->port.rs485.flags & SER_RS485_ENABLED)
+		termios->c_cflag &= ~CRTSCTS;
+
 	if (termios->c_cflag & CRTSCTS) {
-		modem |= UARTMODEM_RXRTSE | UARTMODEM_TXCTSE;
+		modem |= (UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
 	} else {
 		termios->c_cflag &= ~CRTSCTS;
-		modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE);
+		modem &= ~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE);
 	}
 
 	if (termios->c_cflag & CSTOPB)
···
 		sport->port.ops = &lpuart_pops;
 	sport->port.flags = UPF_BOOT_AUTOCONF;
 
-	sport->port.rs485_config = lpuart_config_rs485;
+	if (lpuart_is_32(sport))
+		sport->port.rs485_config = lpuart32_config_rs485;
+	else
+		sport->port.rs485_config = lpuart_config_rs485;
 
 	sport->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
 	if (IS_ERR(sport->ipg_clk)) {
···
 	    sport->port.rs485.delay_rts_after_send)
 		dev_err(&pdev->dev, "driver doesn't support RTS delays\n");
 
-	lpuart_config_rs485(&sport->port, &sport->port.rs485);
+	sport->port.rs485_config(&sport->port, &sport->port.rs485);
 
 	sport->dma_tx_chan = dma_request_slave_channel(sport->port.dev, "tx");
 	if (!sport->dma_tx_chan)

drivers/tty/serial/ifx6x60.c

···
 	struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
 	/* stop activity */
 	tasklet_kill(&ifx_dev->io_work_tasklet);
+
+	pm_runtime_disable(&spi->dev);
+
 	/* free irq */
 	free_irq(gpio_to_irq(ifx_dev->gpio.reset_out), ifx_dev);
 	free_irq(gpio_to_irq(ifx_dev->gpio.srdy), ifx_dev);

drivers/tty/serial/imx.c

···
 		dev_err(dev, "DMA mapping error for TX.\n");
 		return;
 	}
-	desc = dmaengine_prep_slave_sg(chan, sgl, sport->dma_tx_nents,
+	desc = dmaengine_prep_slave_sg(chan, sgl, ret,
 					DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
 	if (!desc) {
 		dma_unmap_sg(dev, sgl, sport->dma_tx_nents,
···
 	}
 }
 
-#define RX_BUF_SIZE	(PAGE_SIZE)
-
 /*
  * There are two kinds of RX DMA interrupts(such as in the MX6Q):
  *   [1] the RX DMA buffer is full.
···
 }
 
 /* RX DMA buffer periods */
-#define RX_DMA_PERIODS 4
+#define RX_DMA_PERIODS	16
+#define RX_BUF_SIZE	(RX_DMA_PERIODS * PAGE_SIZE / 4)
 
 static int imx_uart_start_rx_dma(struct imx_port *sport)
 {

drivers/tty/serial/msm_serial.c

···
 	dma = &msm_port->tx_dma;
 
 	/* allocate DMA resources, if available */
-	dma->chan = dma_request_slave_channel_reason(dev, "tx");
+	dma->chan = dma_request_chan(dev, "tx");
 	if (IS_ERR(dma->chan))
 		goto no_tx;
 
···
 	dma = &msm_port->rx_dma;
 
 	/* allocate DMA resources, if available */
-	dma->chan = dma_request_slave_channel_reason(dev, "rx");
+	dma->chan = dma_request_chan(dev, "rx");
 	if (IS_ERR(dma->chan))
 		goto no_rx;
 
···
 static void msm_reset(struct uart_port *port)
 {
 	struct msm_port *msm_port = UART_TO_MSM(port);
+	unsigned int mr;
 
 	/* reset everything */
 	msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
···
 	msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
 	msm_write(port, UART_CR_CMD_RESET_BREAK_INT, UART_CR);
 	msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
-	msm_write(port, UART_CR_CMD_SET_RFR, UART_CR);
+	msm_write(port, UART_CR_CMD_RESET_RFR, UART_CR);
+	mr = msm_read(port, UART_MR1);
+	mr &= ~UART_MR1_RX_RDY_CTL;
+	msm_write(port, mr, UART_MR1);
 
 	/* Disable DM modes */
 	if (msm_port->is_uartdm)

drivers/tty/serial/pch_uart.c

···
 	struct dma_chan			*chan_rx;
 	struct scatterlist		*sg_tx_p;
 	int				nent;
+	int				orig_nent;
 	struct scatterlist		sg_rx;
 	int				tx_dma_use;
 	void				*rx_buf_virt;
···
 	}
 	xmit->tail &= UART_XMIT_SIZE - 1;
 	async_tx_ack(priv->desc_tx);
-	dma_unmap_sg(port->dev, sg, priv->nent, DMA_TO_DEVICE);
+	dma_unmap_sg(port->dev, sg, priv->orig_nent, DMA_TO_DEVICE);
 	priv->tx_dma_use = 0;
 	priv->nent = 0;
+	priv->orig_nent = 0;
 	kfree(priv->sg_tx_p);
 	pch_uart_hal_enable_interrupt(priv, PCH_UART_HAL_TX_INT);
 }
···
 		dev_err(priv->port.dev, "%s:dma_map_sg Failed\n", __func__);
 		return 0;
 	}
+	priv->orig_nent = num;
 	priv->nent = nent;
 
 	for (i = 0; i < nent; i++, sg++) {

drivers/tty/serial/qcom_geni_serial.c

···
 #include <linux/console.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
+#include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
 #include <linux/qcom-geni-se.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
···
 	bool brk;
 
 	unsigned int tx_remaining;
+	int wakeup_irq;
 };
 
 static const struct uart_ops qcom_geni_console_pops;
···
 		uart_write_wakeup(uport);
 }
 
+static irqreturn_t qcom_geni_serial_wakeup_isr(int isr, void *dev)
+{
+	struct uart_port *uport = dev;
+
+	pm_wakeup_event(uport->dev, 2000);
+
+	return IRQ_HANDLED;
+}
+
 static irqreturn_t qcom_geni_serial_isr(int isr, void *dev)
 {
 	u32 m_irq_en;
···
 	if (uart_console(uport))
 		console_stop(uport->cons);
 
-	free_irq(uport->irq, uport);
+	disable_irq(uport->irq);
 	spin_lock_irqsave(&uport->lock, flags);
 	qcom_geni_serial_stop_tx(uport);
 	qcom_geni_serial_stop_rx(uport);
···
 	int ret;
 	struct qcom_geni_serial_port *port = to_dev_port(uport, uport);
 
-	scnprintf(port->name, sizeof(port->name),
-		  "qcom_serial_%s%d",
-		(uart_console(uport) ? "console" : "uart"), uport->line);
-
 	if (!port->setup) {
 		ret = qcom_geni_serial_port_setup(uport);
 		if (ret)
 			return ret;
 	}
+	enable_irq(uport->irq);
 
-	ret = request_irq(uport->irq, qcom_geni_serial_isr, IRQF_TRIGGER_HIGH,
-							port->name, uport);
-	if (ret)
-		dev_err(uport->dev, "Failed to get IRQ ret %d\n", ret);
-	return ret;
+	return 0;
 }
 
 static unsigned long get_clk_cfg(unsigned long clk_freq)
···
 	port->rx_fifo_depth = DEF_FIFO_DEPTH_WORDS;
 	port->tx_fifo_width = DEF_FIFO_WIDTH_BITS;
 
+	scnprintf(port->name, sizeof(port->name), "qcom_geni_serial_%s%d",
+		(uart_console(uport) ? "console" : "uart"), uport->line);
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
 	uport->irq = irq;
 
+	irq_set_status_flags(uport->irq, IRQ_NOAUTOEN);
+	ret = devm_request_irq(uport->dev, uport->irq, qcom_geni_serial_isr,
+			IRQF_TRIGGER_HIGH, port->name, uport);
+	if (ret) {
+		dev_err(uport->dev, "Failed to get IRQ ret %d\n", ret);
+		return ret;
+	}
+
+	if (!console) {
+		port->wakeup_irq = platform_get_irq(pdev, 1);
+		if (port->wakeup_irq < 0) {
+			dev_err(&pdev->dev, "Failed to get wakeup IRQ %d\n",
+					port->wakeup_irq);
+		} else {
+			irq_set_status_flags(port->wakeup_irq, IRQ_NOAUTOEN);
+			ret = devm_request_irq(uport->dev, port->wakeup_irq,
+				qcom_geni_serial_wakeup_isr,
+				IRQF_TRIGGER_FALLING, "uart_wakeup", uport);
+			if (ret) {
+				dev_err(uport->dev, "Failed to register wakeup IRQ ret %d\n",
+						ret);
+				return ret;
+			}
+
+			device_init_wakeup(&pdev->dev, true);
+			ret = dev_pm_set_wake_irq(&pdev->dev, port->wakeup_irq);
+			if (unlikely(ret))
+				dev_err(uport->dev, "%s:Failed to set IRQ wake:%d\n",
+						__func__, ret);
+		}
+	}
 	uport->private_data = drv;
 	platform_set_drvdata(pdev, port);
 	port->handle_rx = console ? handle_rx_console : handle_rx_uart;
···
 	struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
 	struct uart_port *uport = &port->uport;
 
-	return uart_suspend_port(uport->private_data, uport);
+	uart_suspend_port(uport->private_data, uport);
+
+	if (port->wakeup_irq > 0)
+		enable_irq(port->wakeup_irq);
+
+	return 0;
 }
 
 static int __maybe_unused qcom_geni_serial_sys_resume(struct device *dev)
 {
 	struct qcom_geni_serial_port *port = dev_get_drvdata(dev);
 	struct uart_port *uport = &port->uport;
+
+	if (port->wakeup_irq > 0)
+		disable_irq(port->wakeup_irq);
 
 	return uart_resume_port(uport->private_data, uport);
 }

drivers/tty/serial/serial-tegra.c

···
 	int ret;
 	struct dma_slave_config dma_sconfig;
 
-	dma_chan = dma_request_slave_channel_reason(tup->uport.dev,
-						dma_to_memory ? "rx" : "tx");
+	dma_chan = dma_request_chan(tup->uport.dev, dma_to_memory ? "rx" : "tx");
 	if (IS_ERR(dma_chan)) {
 		ret = PTR_ERR(dma_chan);
 		dev_err(tup->uport.dev,

drivers/tty/serial/serial_core.c

···
 	if (!uport)
 		goto out;
 
-	if (uport->type != PORT_UNKNOWN)
+	if (uport->type != PORT_UNKNOWN && uport->ops->break_ctl)
 		uport->ops->break_ctl(uport, break_state);
 	ret = 0;
 out:

drivers/tty/serial/sirfsoc_uart.h

···
 	empty_bit = ilog2(port->fifosize) + 1;
 	return (1 << empty_bit);
 }
-struct sirfsoc_uart_register sirfsoc_usp = {
+
+static struct sirfsoc_uart_register sirfsoc_usp = {
 	.uart_reg = {
 		.sirfsoc_mode1		= 0x0000,
 		.sirfsoc_mode2		= 0x0004,
···
 	},
 };
 
-struct sirfsoc_uart_register sirfsoc_uart = {
+static struct sirfsoc_uart_register sirfsoc_uart = {
 	.uart_reg = {
 		.sirfsoc_line_ctrl	= 0x0040,
 		.sirfsoc_tx_rx_en	= 0x004c,

drivers/tty/serial/sprd_serial.c

···
 	}
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static int sprd_poll_init(struct uart_port *port)
+{
+	if (port->state->pm_state != UART_PM_STATE_ON) {
+		sprd_pm(port, UART_PM_STATE_ON, 0);
+		port->state->pm_state = UART_PM_STATE_ON;
+	}
+
+	return 0;
+}
+
+static int sprd_poll_get_char(struct uart_port *port)
+{
+	while (!(serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK))
+		cpu_relax();
+
+	return serial_in(port, SPRD_RXD);
+}
+
+static void sprd_poll_put_char(struct uart_port *port, unsigned char ch)
+{
+	while (serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
+		cpu_relax();
+
+	serial_out(port, SPRD_TXD, ch);
+}
+#endif
+
 static const struct uart_ops serial_sprd_ops = {
 	.tx_empty = sprd_tx_empty,
 	.get_mctrl = sprd_get_mctrl,
···
 	.config_port = sprd_config_port,
 	.verify_port = sprd_verify_port,
 	.pm = sprd_pm,
+#ifdef CONFIG_CONSOLE_POLL
+	.poll_init	= sprd_poll_init,
+	.poll_get_char	= sprd_poll_get_char,
+	.poll_put_char	= sprd_poll_put_char,
+#endif
 };
 
 #ifdef CONFIG_SERIAL_SPRD_CONSOLE

drivers/tty/serial/stm32-usart.c

···
 		 * cleared by the sequence [read SR - read DR].
 		 */
 		if ((sr & USART_SR_ERR_MASK) && ofs->icr != UNDEF_REG)
-			stm32_clr_bits(port, ofs->icr, USART_ICR_ORECF |
-				       USART_ICR_PECF | USART_ICR_FECF);
+			writel_relaxed(sr & USART_SR_ERR_MASK,
+				       port->membase + ofs->icr);
 
 		c = stm32_get_char(port, &sr, &stm32_port->last_res);
 		port->icount.rx++;
···
 	if (ofs->icr == UNDEF_REG)
 		stm32_clr_bits(port, ofs->isr, USART_SR_TC);
 	else
-		stm32_set_bits(port, ofs->icr, USART_ICR_TCCF);
+		writel_relaxed(USART_ICR_TCCF, port->membase + ofs->icr);
 
 	if (stm32_port->tx_ch)
 		stm32_transmit_chars_dma(port);

drivers/tty/serial/uartlite.c

···
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
 #include <linux/clk.h>
-#include <linux/pm_runtime.h>
 
 #define ULITE_NAME		"ttyUL"
 #define ULITE_MAJOR		204
···
 #define ULITE_CONTROL_RST_TX	0x01
 #define ULITE_CONTROL_RST_RX	0x02
 #define ULITE_CONTROL_IE	0x10
-#define UART_AUTOSUSPEND_TIMEOUT	3000
 
 /* Static pointer to console port */
 #ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
···
 struct uartlite_data {
 	const struct uartlite_reg_ops *reg_ops;
 	struct clk *clk;
-	struct uart_driver *ulite_uart_driver;
 };
 
 struct uartlite_reg_ops {
···
 static void ulite_pm(struct uart_port *port, unsigned int state,
 		     unsigned int oldstate)
 {
-	if (!state) {
-		pm_runtime_get_sync(port->dev);
-	} else {
-		pm_runtime_mark_last_busy(port->dev);
-		pm_runtime_put_autosuspend(port->dev);
-	}
+	struct uartlite_data *pdata = port->private_data;
+
+	if (!state)
+		clk_enable(pdata->clk);
+	else
+		clk_disable(pdata->clk);
 }
 
 #ifdef CONFIG_CONSOLE_POLL
···
 	int rc = 0;
 
 	if (port) {
-		struct uartlite_data *pdata = port->private_data;
-
-		rc = uart_remove_one_port(pdata->ulite_uart_driver, port);
+		rc = uart_remove_one_port(&ulite_uart_driver, port);
 		dev_set_drvdata(dev, NULL);
 		port->mapbase = 0;
 	}
···
 {
 	struct uart_port *port = dev_get_drvdata(dev);
 
-	if (port) {
-		struct uartlite_data *pdata = port->private_data;
-
-		uart_suspend_port(pdata->ulite_uart_driver, port);
-	}
+	if (port)
+		uart_suspend_port(&ulite_uart_driver, port);
 
 	return 0;
 }
···
 {
 	struct uart_port *port = dev_get_drvdata(dev);
 
-	if (port) {
-		struct uartlite_data *pdata = port->private_data;
-
-		uart_resume_port(pdata->ulite_uart_driver, port);
-	}
+	if (port)
+		uart_resume_port(&ulite_uart_driver, port);
 
 	return 0;
 }
 
-static int __maybe_unused ulite_runtime_suspend(struct device *dev)
-{
-	struct uart_port *port = dev_get_drvdata(dev);
-	struct uartlite_data *pdata = port->private_data;
-
-	clk_disable(pdata->clk);
-	return 0;
-};
-
-static int __maybe_unused ulite_runtime_resume(struct device *dev)
-{
-	struct uart_port *port = dev_get_drvdata(dev);
-	struct uartlite_data *pdata = port->private_data;
-
-	clk_enable(pdata->clk);
-	return 0;
-}
 /* ---------------------------------------------------------------------
  * Platform bus binding
  */
 
-static const struct dev_pm_ops ulite_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(ulite_suspend, ulite_resume)
-	SET_RUNTIME_PM_OPS(ulite_runtime_suspend,
-			   ulite_runtime_resume, NULL)
-};
+static SIMPLE_DEV_PM_OPS(ulite_pm_ops, ulite_suspend, ulite_resume);
 
 #if defined(CONFIG_OF)
 /* Match table for of_platform binding */
···
 	if (prop)
 		id = be32_to_cpup(prop);
 #endif
-	if (id < 0) {
-		/* Look for a serialN alias */
-		id = of_alias_get_id(pdev->dev.of_node, "serial");
-		if (id < 0)
-			id = 0;
-	}
-
-	if (!ulite_uart_driver.state) {
-		dev_dbg(&pdev->dev, "uartlite: calling uart_register_driver()\n");
-		ret = uart_register_driver(&ulite_uart_driver);
-		if (ret < 0) {
-			dev_err(&pdev->dev, "Failed to register driver\n");
-			return ret;
-		}
-	}
-
 	pdata = devm_kzalloc(&pdev->dev, sizeof(struct uartlite_data),
 			     GFP_KERNEL);
 	if (!pdata)
···
 		pdata->clk = NULL;
 	}
 
-	pdata->ulite_uart_driver = &ulite_uart_driver;
 	ret = clk_prepare_enable(pdata->clk);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to prepare clock\n");
 		return ret;
 	}
 
-	pm_runtime_use_autosuspend(&pdev->dev);
-	pm_runtime_set_autosuspend_delay(&pdev->dev, UART_AUTOSUSPEND_TIMEOUT);
-	pm_runtime_set_active(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
+	if (!ulite_uart_driver.state) {
+		dev_dbg(&pdev->dev, "uartlite: calling uart_register_driver()\n");
+		ret = uart_register_driver(&ulite_uart_driver);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "Failed to register driver\n");
+			return ret;
+		}
+	}
 
 	ret = ulite_assign(&pdev->dev, id, res->start, irq, pdata);
 
-	pm_runtime_mark_last_busy(&pdev->dev);
-	pm_runtime_put_autosuspend(&pdev->dev);
+	clk_disable(pdata->clk);
 
 	return ret;
 }
···
 {
 	struct uart_port *port = dev_get_drvdata(&pdev->dev);
 	struct uartlite_data *pdata = port->private_data;
-	int rc;
 
-	clk_unprepare(pdata->clk);
-	rc = ulite_release(&pdev->dev);
-	pm_runtime_disable(&pdev->dev);
-	pm_runtime_set_suspended(&pdev->dev);
-	pm_runtime_dont_use_autosuspend(&pdev->dev);
-	return rc;
+	clk_disable_unprepare(pdata->clk);
+	return ulite_release(&pdev->dev);
 }
 
 /* work with hotplug and coldplug */

drivers/tty/tty_io.c

···
 	if (!tty->port)
 		tty->port = driver->ports[idx];
 
-	WARN_RATELIMIT(!tty->port,
-			"%s: %s driver does not set tty->port. This will crash the kernel later. Fix the driver!\n",
-			__func__, tty->driver->name);
+	if (WARN_RATELIMIT(!tty->port,
+			"%s: %s driver does not set tty->port. This would crash the kernel. Fix the driver!\n",
+			__func__, tty->driver->name)) {
+		retval = -EINVAL;
+		goto err_release_lock;
+	}
 
 	retval = tty_ldisc_lock(tty, 5 * HZ);
 	if (retval)
···
 /**
  *	tty_open_by_driver	-	open a tty device
  *	@device: dev_t of device to open
- *	@inode: inode of device file
  *	@filp: file pointer to tty
  *
  *	Performs the driver lookup, checks for a reopen, or otherwise
···
  *	  - concurrent tty driver removal w/ lookup
  *	  - concurrent tty removal from driver table
  */
-static struct tty_struct *tty_open_by_driver(dev_t device, struct inode *inode,
+static struct tty_struct *tty_open_by_driver(dev_t device,
 					     struct file *filp)
 {
 	struct tty_struct *tty;
···
 
 	tty = tty_open_current_tty(device, filp);
 	if (!tty)
-		tty = tty_open_by_driver(device, inode, filp);
+		tty = tty_open_by_driver(device, filp);
 
 	if (IS_ERR(tty)) {
 		tty_free_file(filp);

drivers/tty/tty_ldisc.c

···
  *		takes tty_ldiscs_lock to guard against ldisc races
  */
 
-#if defined(CONFIG_LDISC_AUTOLOAD)
-	#define INITIAL_AUTOLOAD_STATE	1
-#else
-	#define INITIAL_AUTOLOAD_STATE	0
-#endif
-static int tty_ldisc_autoload = INITIAL_AUTOLOAD_STATE;
+static int tty_ldisc_autoload = IS_BUILTIN(CONFIG_LDISC_AUTOLOAD);
 
 static struct tty_ldisc *tty_ldisc_get(struct tty_struct *tty, int disc)
 {

drivers/tty/vt/keyboard.c

···
 
 	if (event_type == EV_MSC && event_code == MSC_RAW && HW_RAW(handle->dev))
 		kbd_rawcode(value);
-	if (event_type == EV_KEY)
+	if (event_type == EV_KEY && event_code <= KEY_MAX)
 		kbd_keycode(event_code, value, HW_RAW(handle->dev));
 
 	spin_unlock(&kbd_event_lock);

drivers/tty/vt/vc_screen.c

···
 	size_t ret;
 	char *con_buf;
 
+	if (use_unicode(inode))
+		return -EOPNOTSUPP;
+
 	con_buf = (char *) __get_free_page(GFP_KERNEL);
 	if (!con_buf)
 		return -ENOMEM;

include/uapi/linux/serial_core.h

···
 /* Sunix UART */
 #define PORT_SUNIX	121
 
-/* Freescale Linflex UART */
+/* Freescale LINFlexD UART */
 #define PORT_LINFLEXUART	122
 
 #endif /* _UAPILINUX_SERIAL_CORE_H */