Commit 8a73cd4c authored by Naveen Krishna Ch's avatar Naveen Krishna Ch Committed by Wolfram Sang
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i2c: exynos5: add High Speed I2C controller driver 



Adds support for High Speed I2C driver found in Exynos5 and
later SoCs from Samsung.

Driver only supports Device Tree method.

Signed-off-by: default avatarNaveen Krishna Chatradhi <ch.naveen@samsung.com>
Signed-off-by: default avatarTaekgyun Ko <taeggyun.ko@samsung.com>
Reviewed-by: default avatarSimon Glass <sjg@google.com>
Signed-off-by: default avatarYuvaraj Kumar C D <yuvaraj.cd@samsung.com>
Signed-off-by: default avatarAndrew Bresticker <abrestic@google.com>
[wsa: rebased to v3.12-rc4 (no of_i2c.h anymore)]
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 043a3f11

Documentation/devicetree/bindings/i2c/i2c-exynos5.txt

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* Samsung's High Speed I2C controller



The Samsung's High Speed I2C controller is used to interface with I2C devices

at various speeds ranging from 100khz to 3.4Mhz.



Required properties:

  - compatible: value should be.

      -> "samsung,exynos5-hsi2c", for i2c compatible with exynos5 hsi2c.

  - reg: physical base address of the controller and length of memory mapped

    region.

  - interrupts: interrupt number to the cpu.

  - #address-cells: always 1 (for i2c addresses)

  - #size-cells: always 0



  - Pinctrl:

    - pinctrl-0: Pin control group to be used for this controller.

    - pinctrl-names: Should contain only one value - "default".



Optional properties:

  - clock-frequency: Desired operating frequency in Hz of the bus.

    -> If not specified, the bus operates in fast-speed mode at

       at 100khz.

    -> If specified, the bus operates in high-speed mode only if the

       clock-frequency is >= 1Mhz.



Example:



hsi2c@12ca0000 {

	compatible = "samsung,exynos5-hsi2c";

	reg = <0x12ca0000 0x100>;

	interrupts = <56>;

	clock-frequency = <100000>;



	pinctrl-0 = <&i2c4_bus>;

	pinctrl-names = "default";



	#address-cells = <1>;

	#size-cells = <0>;



	s2mps11_pmic@66 {

		compatible = "samsung,s2mps11-pmic";

		reg = <0x66>;

	};

};

drivers/i2c/busses/Kconfig

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@@ -436,6 +436,13 @@ config I2C_EG20T 
	  ML7213/ML7223/ML7831 is companion chip for Intel Atom E6xx series.

	  ML7213/ML7223/ML7831 is completely compatible for Intel EG20T PCH.



config I2C_EXYNOS5

	tristate "Exynos5 high-speed I2C driver"

	depends on ARCH_EXYNOS5 && OF

	help

	  Say Y here to include support for high-speed I2C controller in the

	  Exynos5 based Samsung SoCs.



config I2C_GPIO

	tristate "GPIO-based bitbanging I2C"

	depends on GPIOLIB

drivers/i2c/busses/Makefile

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@@ -42,6 +42,7 @@ i2c-designware-platform-objs := i2c-designware-platdrv.o 
obj-$(CONFIG_I2C_DESIGNWARE_PCI)	+= i2c-designware-pci.o

i2c-designware-pci-objs := i2c-designware-pcidrv.o

obj-$(CONFIG_I2C_EG20T)		+= i2c-eg20t.o

obj-$(CONFIG_I2C_EXYNOS5)	+= i2c-exynos5.o

obj-$(CONFIG_I2C_GPIO)		+= i2c-gpio.o

obj-$(CONFIG_I2C_HIGHLANDER)	+= i2c-highlander.o

obj-$(CONFIG_I2C_IBM_IIC)	+= i2c-ibm_iic.o

drivers/i2c/busses/i2c-exynos5.c

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