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Commit 53d74fd7 authored by Viresh Kumar's avatar Viresh Kumar
Browse files

Merge commit 'gpio-lw/devel' into spear-for-3.8 

This merges dependency branch gpio-lw/devel for SPEAr DT updates.
parents 22595e28 b53bc281

Documentation/devicetree/bindings/gpio/spear_spics.txt

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=== ST Microelectronics SPEAr SPI CS Driver ===



SPEAr platform provides a provision to control chipselects of ARM PL022 Prime

Cell spi controller through its system registers, which otherwise remains under

PL022 control. If chipselect remain under PL022 control then they would be

released as soon as transfer is over and TxFIFO becomes empty. This is not

desired by some of the device protocols above spi which expect (multiple)

transfers without releasing their chipselects.



Chipselects can be controlled by software by turning them as GPIOs. SPEAr

provides another interface through system registers through which software can

directly control each PL022 chipselect. Hence, it is natural for SPEAr to export

the control of this interface as gpio.



Required properties:



  * compatible: should be defined as "st,spear-spics-gpio"

  * reg: mentioning address range of spics controller

  * st-spics,peripcfg-reg: peripheral configuration register offset

  * st-spics,sw-enable-bit: bit offset to enable sw control

  * st-spics,cs-value-bit: bit offset to drive chipselect low or high

  * st-spics,cs-enable-mask: chip select number bit mask

  * st-spics,cs-enable-shift: chip select number program offset

  * gpio-controller: Marks the device node as gpio controller

  * #gpio-cells: should be 1 and will mention chip select number



All the above bit offsets are within peripcfg register.



Example:

-------

spics: spics@e0700000{

        compatible = "st,spear-spics-gpio";

        reg = <0xe0700000 0x1000>;

        st-spics,peripcfg-reg = <0x3b0>;

        st-spics,sw-enable-bit = <12>;

        st-spics,cs-value-bit = <11>;

        st-spics,cs-enable-mask = <3>;

        st-spics,cs-enable-shift = <8>;

        gpio-controller;

        #gpio-cells = <2>;

};





spi0: spi@e0100000 {

        status = "okay";

        num-cs = <3>;

        cs-gpios = <&gpio1 7 0>, <&spics 0>,

                   <&spics 1>;

	...

}

arch/arm/Kconfig

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@@ -364,6 +364,7 @@ config ARCH_CNS3XXX 


config ARCH_CLPS711X

	bool "Cirrus Logic CLPS711x/EP721x/EP731x-based"

	select ARCH_REQUIRE_GPIOLIB

	select ARCH_USES_GETTIMEOFFSET

	select CLKDEV_LOOKUP

	select COMMON_CLK

arch/arm/plat-spear/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ config ARCH_SPEAR13XX 
	bool "ST SPEAr13xx with Device Tree"

	select ARM_GIC

	select CPU_V7

	select GPIO_SPEAR_SPICS

	select HAVE_SMP

	select MIGHT_HAVE_CACHE_L2X0

	select PINCTRL

drivers/gpio/Kconfig

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Original line number Diff line number Diff line
@@ -86,11 +86,26 @@ config GPIO_DA9052 
	help

	  Say yes here to enable the GPIO driver for the DA9052 chip.



config GPIO_DA9055

	tristate "Dialog Semiconductor DA9055 GPIO"

	depends on MFD_DA9055

	help

	  Say yes here to enable the GPIO driver for the DA9055 chip.



	  The Dialog DA9055 PMIC chip has 3 GPIO pins that can be

	  be controller by this driver.



	  If driver is built as a module it will be called gpio-da9055.



config GPIO_MAX730X

	tristate



comment "Memory mapped GPIO drivers:"



config GPIO_CLPS711X

	def_bool y

	depends on ARCH_CLPS711X



config GPIO_GENERIC_PLATFORM

	tristate "Generic memory-mapped GPIO controller support (MMIO platform device)"

	select GPIO_GENERIC
@@ -181,6 +196,13 @@ config GPIO_PXA 
	help

	  Say yes here to support the PXA GPIO device



config GPIO_SPEAR_SPICS

	bool "ST SPEAr13xx SPI Chip Select as GPIO support"

	depends on PLAT_SPEAR

	select GENERIC_IRQ_CHIP

	help

	  Say yes here to support ST SPEAr SPI Chip Select as GPIO device



config GPIO_STA2X11

	bool "STA2x11/ConneXt GPIO support"

	depends on MFD_STA2X11

drivers/gpio/Makefile

+3 −0
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@@ -16,8 +16,10 @@ obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o 
obj-$(CONFIG_GPIO_AMD8111)	+= gpio-amd8111.o

obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o

obj-$(CONFIG_GPIO_BT8XX)	+= gpio-bt8xx.o

obj-$(CONFIG_GPIO_CLPS711X)	+= gpio-clps711x.o

obj-$(CONFIG_GPIO_CS5535)	+= gpio-cs5535.o

obj-$(CONFIG_GPIO_DA9052)	+= gpio-da9052.o

obj-$(CONFIG_GPIO_DA9055)	+= gpio-da9055.o

obj-$(CONFIG_ARCH_DAVINCI)	+= gpio-davinci.o

obj-$(CONFIG_GPIO_EM)		+= gpio-em.o

obj-$(CONFIG_GPIO_EP93XX)	+= gpio-ep93xx.o
@@ -57,6 +59,7 @@ obj-$(CONFIG_PLAT_SAMSUNG) += gpio-samsung.o 
obj-$(CONFIG_ARCH_SA1100)	+= gpio-sa1100.o

obj-$(CONFIG_GPIO_SCH)		+= gpio-sch.o

obj-$(CONFIG_GPIO_SODAVILLE)	+= gpio-sodaville.o

obj-$(CONFIG_GPIO_SPEAR_SPICS)	+= gpio-spear-spics.o

obj-$(CONFIG_GPIO_STA2X11)	+= gpio-sta2x11.o

obj-$(CONFIG_GPIO_STMPE)	+= gpio-stmpe.o

obj-$(CONFIG_GPIO_STP_XWAY)	+= gpio-stp-xway.o