net: pcs: Move XPCS into new PCS subdirectory

Create drivers/net/pcs and move the Synopsys DesignWare XPCS into the
new directory. Move the header file into a subdirectory
include/linux/pcs

Start a naming convention of all PCS files use the prefix pcs-, and
rename the XPCS files to fit.

v2:
Add include/linux/pcs

v4:
Fix include path in stmmac.
Remove PCS_DEVICES to avoid new prompts

Cc: Jose Abreu <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Signed-off-by: Andrew Lunn <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/net/mdio*
 F:	Documentation/devicetree/bindings/net/qca,ar803x.yaml
 F:	Documentation/networking/phy.rst
+F:	drivers/net/pcs/
 F:	drivers/net/phy/
 F:	drivers/of/of_mdio.c
 F:	drivers/of/of_net.c
···
 M:	Jose Abreu <[e-mail]>
 L:	[e-mail]
 S:	Supported
-F:	drivers/net/phy/mdio-xpcs.c
-F:	include/linux/mdio-xpcs.h
+F:	drivers/net/pcs/pcs-xpcs.c
+F:	include/linux/pcs/pcs-xpcs.h
 
 SYNOPSYS DESIGNWARE I2C DRIVER
 M:	Jarkko Nikula <[e-mail]>

drivers/net/Kconfig

···
 
 source "drivers/net/phy/Kconfig"
 
+source "drivers/net/pcs/Kconfig"
+
 source "drivers/net/plip/Kconfig"
 
 source "drivers/net/ppp/Kconfig"

drivers/net/Makefile

···
 obj-$(CONFIG_NET) += Space.o loopback.o
 obj-$(CONFIG_NETCONSOLE) += netconsole.o
 obj-y += phy/
+obj-y += pcs/
 obj-$(CONFIG_RIONET) += rionet.o
 obj-$(CONFIG_NET_TEAM) += team/
 obj-$(CONFIG_TUN) += tun.o

drivers/net/ethernet/stmicro/stmmac/Kconfig

···
 	tristate "STMicroelectronics Multi-Gigabit Ethernet driver"
 	depends on HAS_IOMEM && HAS_DMA
 	select MII
-	select MDIO_XPCS
+	select PCS_XPCS
 	select PAGE_POOL
 	select PHYLINK
 	select CRC32

drivers/net/ethernet/stmicro/stmmac/common.h

···
 #include <linux/netdevice.h>
 #include <linux/stmmac.h>
 #include <linux/phy.h>
-#include <linux/mdio-xpcs.h>
+#include <linux/pcs/pcs-xpcs.h>
 #include <linux/module.h>
 #if IS_ENABLED(CONFIG_VLAN_8021Q)
 #define STMMAC_VLAN_TAG_USED

drivers/net/pcs/Kconfig

···
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# PCS Layer Configuration
+#
+
+menu "PCS device drivers"
+
+config PCS_XPCS
+	tristate "Synopsys DesignWare XPCS controller"
+	select MDIO_BUS
+	depends on MDIO_DEVICE
+	help
+	  This module provides helper functions for Synopsys DesignWare XPCS
+	  controllers.
+
+endmenu

drivers/net/pcs/Makefile

···
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for Linux PCS drivers
+
+obj-$(CONFIG_PCS_XPCS)		+= pcs-xpcs.o

drivers/net/phy/Kconfig

···
 	  This module provides a driver for the MDIO busses found in the
 	  APM X-Gene SoC's.
 
-config MDIO_XPCS
-	tristate "Synopsys DesignWare XPCS controller"
-	help
-	  This module provides helper functions for Synopsys DesignWare XPCS
-	  controllers.
-
 endif
 endif
 

drivers/net/phy/Makefile

···
 obj-$(CONFIG_MDIO_SUN4I)	+= mdio-sun4i.o
 obj-$(CONFIG_MDIO_THUNDER)	+= mdio-thunder.o
 obj-$(CONFIG_MDIO_XGENE)	+= mdio-xgene.o
-obj-$(CONFIG_MDIO_XPCS)		+= mdio-xpcs.o
 
 obj-$(CONFIG_NETWORK_PHY_TIMESTAMPING) += mii_timestamper.o
 

drivers/net/phy/mdio-xpcs.c drivers/net/pcs/pcs-xpcs.c

···
  */
 
 #include <linux/delay.h>
+#include <linux/pcs/pcs-xpcs.h>
 #include <linux/mdio.h>
-#include <linux/mdio-xpcs.h>
 #include <linux/phylink.h>
 #include <linux/workqueue.h>
 

include/linux/mdio-xpcs.h include/linux/pcs/pcs-xpcs.h

···
  * Synopsys DesignWare XPCS helpers
  */
 
-#ifndef __LINUX_MDIO_XPCS_H
-#define __LINUX_MDIO_XPCS_H
+#ifndef __LINUX_PCS_XPCS_H
+#define __LINUX_PCS_XPCS_H
 
 #include <linux/phy.h>
 #include <linux/phylink.h>
···
 	int (*probe)(struct mdio_xpcs_args *xpcs, phy_interface_t interface);
 };
 
-#if IS_ENABLED(CONFIG_MDIO_XPCS)
+#if IS_ENABLED(CONFIG_PCS_XPCS)
 struct mdio_xpcs_ops *mdio_xpcs_get_ops(void);
 #else
 static inline struct mdio_xpcs_ops *mdio_xpcs_get_ops(void)
···
 }
 #endif
 
-#endif /* __LINUX_MDIO_XPCS_H */
+#endif /* __LINUX_PCS_XPCS_H */