pinctrl: ralink: add a pinctrl driver for the rt2880 family

These Socs have 1-3 banks of 8-32 gpios. Rather then setting the muxing of each
pin individually, these socs have mux groups that when set will effect 1-N pins.
Pin groups have a 2, 4 or 8 different muxes.

Acked-by: Linus Walleij <[e-mail]>
Signed-off-by: Sergio Paracuellos <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/pinctrl/Kconfig

···
 source "drivers/pinctrl/nuvoton/Kconfig"
 source "drivers/pinctrl/pxa/Kconfig"
 source "drivers/pinctrl/qcom/Kconfig"
+source "drivers/pinctrl/ralink/Kconfig"
 source "drivers/pinctrl/renesas/Kconfig"
 source "drivers/pinctrl/samsung/Kconfig"
 source "drivers/pinctrl/spear/Kconfig"

drivers/pinctrl/Makefile

···
 obj-$(CONFIG_ARCH_NPCM7XX)	+= nuvoton/
 obj-$(CONFIG_PINCTRL_PXA)	+= pxa/
 obj-$(CONFIG_ARCH_QCOM)		+= qcom/
+obj-$(CONFIG_PINCTRL_RALINK)	+= ralink/
 obj-$(CONFIG_PINCTRL_RENESAS)	+= renesas/
 obj-$(CONFIG_PINCTRL_SAMSUNG)	+= samsung/
 obj-$(CONFIG_PINCTRL_SPEAR)	+= spear/

drivers/pinctrl/ralink/Kconfig

···
+# SPDX-License-Identifier: GPL-2.0-only
+menu "Ralink pinctrl drivers"
+        depends on RALINK
+
+config PINCTRL_RALINK
+        bool "Ralink pin control support"
+        default y if RALINK
+
+config PINCTRL_RT2880
+        bool "RT2880 pinctrl driver for RALINK/Mediatek SOCs"
+        select PINMUX
+        select GENERIC_PINCONF
+
+endmenu

drivers/staging/Kconfig

···
 
 source "drivers/staging/mt7621-pci-phy/Kconfig"
 
-source "drivers/staging/mt7621-pinctrl/Kconfig"
-
 source "drivers/staging/mt7621-dma/Kconfig"
 
 source "drivers/staging/ralink-gdma/Kconfig"

drivers/staging/Makefile

···
 obj-$(CONFIG_PI433)		+= pi433/
 obj-$(CONFIG_PCI_MT7621)	+= mt7621-pci/
 obj-$(CONFIG_PCI_MT7621_PHY)	+= mt7621-pci-phy/
-obj-$(CONFIG_PINCTRL_RT2880)	+= mt7621-pinctrl/
 obj-$(CONFIG_SOC_MT7621)	+= mt7621-dma/
 obj-$(CONFIG_DMA_RALINK)	+= ralink-gdma/
 obj-$(CONFIG_SOC_MT7621)	+= mt7621-dts/

drivers/staging/mt7621-pinctrl/Kconfig

···
-# SPDX-License-Identifier: GPL-2.0
-config PINCTRL_RT2880
-	bool "RT2800 pinctrl driver for RALINK/Mediatek SOCs"
-	depends on RALINK
-	select PINMUX
-	select GENERIC_PINCONF

drivers/staging/mt7621-pinctrl/Makefile drivers/pinctrl/ralink/Makefile

···
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_PINCTRL_RT2880)   += pinctrl-rt2880.o
-
-ccflags-y += -I$(srctree)/drivers/pinctrl

drivers/staging/mt7621-pinctrl/TODO

···
-
-- general code review and cleanup
-- should probably be always selected by 'config RALINK'
-- ensure device-tree requirements are documented
-
-Cc: NeilBrown <[e-mail]>

drivers/staging/mt7621-pinctrl/pinctrl-rt2880.c drivers/pinctrl/ralink/pinctrl-rt2880.c

···
 #include <asm/mach-ralink/pinmux.h>
 #include <asm/mach-ralink/mt7620.h>
 
-#include "core.h"
-#include "pinctrl-utils.h"
+#include "../core.h"
+#include "../pinctrl-utils.h"
 
 #define SYSC_REG_GPIO_MODE	0x60
 #define SYSC_REG_GPIO_MODE2	0x64