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Commit 170c6152 authored by Tony Prisk's avatar Tony Prisk
Browse files

pinctrl: gpio: vt8500: Add pincontrol driver for arch-vt8500 



This patch adds support for the GPIO/pinmux controller found on the VIA
VT8500 and Wondermedia WM8xxx-series SoCs.

Each pin within the controller is capable of operating as a GPIO or as
an alternate function. The pins are numbered according to their control
bank/bit so that if new pins are added, the existing numbering is maintained.

All currently supported SoCs are included: VT8500, WM8505, WM8650, WM8750 and
WM8850.

Signed-off-by: default avatarTony Prisk <linux@prisktech.co.nz>
Reviewed-by: default avatarStephen Warren <swarren@nvidia.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 01bb914c

Documentation/devicetree/bindings/pinctrl/pinctrl-vt8500.txt

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VIA VT8500 and Wondermedia WM8xxx-series pinmux/gpio controller



These SoCs contain a combined Pinmux/GPIO module. Each pin may operate as

either a GPIO in, GPIO out or as an alternate function (I2C, SPI etc).



Required properties:

- compatible: "via,vt8500-pinctrl", "wm,wm8505-pinctrl", "wm,wm8650-pinctrl",

	"wm8750-pinctrl" or "wm,wm8850-pinctrl"

- reg: Should contain the physical address of the module's registers.

- interrupt-controller: Marks the device node as an interrupt controller.

- #interrupt-cells: Should be two.

- gpio-controller: Marks the device node as a GPIO controller.

- #gpio-cells : Should be two. The first cell is the pin number and the

  second cell is used to specify optional parameters.

	bit 0 - active low



Please refer to ../gpio/gpio.txt for a general description of GPIO bindings.



Please refer to pinctrl-bindings.txt in this directory for details of the

common pinctrl bindings used by client devices, including the meaning of the

phrase "pin configuration node".



Each pin configuration node lists the pin(s) to which it applies, and one or

more of the mux functions to select on those pin(s), and pull-up/down

configuration. Each subnode only affects those parameters that are explicitly

listed. In other words, a subnode that lists only a mux function implies no

information about any pull configuration. Similarly, a subnode that lists only

a pull parameter implies no information about the mux function.



Required subnode-properties:

- wm,pins: An array of cells. Each cell contains the ID of a pin.



Optional subnode-properties:

- wm,function: Integer, containing the function to mux to the pin(s):

  0: GPIO in

  1: GPIO out

  2: alternate



- wm,pull: Integer, representing the pull-down/up to apply to the pin(s):

  0: none

  1: down

  2: up



Each of wm,function and wm,pull may contain either a single value which

will be applied to all pins in wm,pins, or one value for each entry in

wm,pins.



Example:



	pinctrl: pinctrl {

		compatible = "wm,wm8505-pinctrl";

		reg = <0xD8110000 0x10000>;

		interrupt-controller;

		#interrupt-cells = <2>;

		gpio-controller;

		#gpio-cells = <2>;

	};

arch/arm/mach-vt8500/Kconfig

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@@ -7,6 +7,7 @@ config ARCH_VT8500 
	select GENERIC_CLOCKEVENTS

	select HAVE_CLK

	select VT8500_TIMER

	select PINCTRL

	help

	  Support for VIA/WonderMedia VT8500/WM85xx System-on-Chip.

drivers/pinctrl/Kconfig

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@@ -229,6 +229,7 @@ config PINCTRL_EXYNOS5440 
source "drivers/pinctrl/mvebu/Kconfig"

source "drivers/pinctrl/sh-pfc/Kconfig"

source "drivers/pinctrl/spear/Kconfig"

source "drivers/pinctrl/vt8500/Kconfig"



config PINCTRL_XWAY

	bool

drivers/pinctrl/Makefile

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@@ -52,3 +52,4 @@ obj-$(CONFIG_PLAT_ORION) += mvebu/ 
obj-$(CONFIG_ARCH_SHMOBILE)	+= sh-pfc/

obj-$(CONFIG_SUPERH)		+= sh-pfc/

obj-$(CONFIG_PLAT_SPEAR)	+= spear/

obj-$(CONFIG_ARCH_VT8500)	+= vt8500/

drivers/pinctrl/vt8500/Kconfig

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#

# VIA/Wondermedia PINCTRL drivers

#



if ARCH_VT8500



config PINCTRL_WMT

	bool

	select PINMUX

	select GENERIC_PINCONF



config PINCTRL_VT8500

	bool "VIA VT8500 pin controller driver"

	depends on ARCH_WM8505

	select PINCTRL_WMT

	help

	  Say yes here to support the gpio/pin control module on

	  VIA VT8500 SoCs.



config PINCTRL_WM8505

	bool "Wondermedia WM8505 pin controller driver"

	depends on ARCH_WM8505

	select PINCTRL_WMT

	help

	  Say yes here to support the gpio/pin control module on

	  Wondermedia WM8505 SoCs.



config PINCTRL_WM8650

	bool "Wondermedia WM8650 pin controller driver"

	depends on ARCH_WM8505

	select PINCTRL_WMT

	help

	  Say yes here to support the gpio/pin control module on

	  Wondermedia WM8650 SoCs.



config PINCTRL_WM8750

	bool "Wondermedia WM8750 pin controller driver"

	depends on ARCH_WM8750

	select PINCTRL_WMT

	help

	  Say yes here to support the gpio/pin control module on

	  Wondermedia WM8750 SoCs.



config PINCTRL_WM8850

	bool "Wondermedia WM8850 pin controller driver"

	depends on ARCH_WM8850

	select PINCTRL_WMT

	help

	  Say yes here to support the gpio/pin control module on

	  Wondermedia WM8850 SoCs.



endif