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Commit 85b4fab2 authored by Maxime COQUELIN's avatar Maxime COQUELIN Committed by Wolfram Sang
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i2c: i2c-st: Add ST I2C controller 



This patch adds support to SSC (Synchronous Serial Controller)
I2C driver. This IP also supports SPI protocol, but this is not
the aim of this driver.

This IP is embedded in all ST SoCs for Set-top box platorms, and
supports I2C Standard and Fast modes.

Signed-off-by: default avatarMaxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 8a73cd4c

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

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ST SSC binding, for I2C mode operation



Required properties :

- compatible : Must be "st,comms-ssc-i2c" or "st,comms-ssc4-i2c"

- reg : Offset and length of the register set for the device

- interrupts : the interrupt specifier

- clock-names: Must contain "ssc".

- clocks: Must contain an entry for each name in clock-names. See the common

  clock bindings.

- A pinctrl state named "default" must be defined to set pins in mode of

  operation for I2C transfer.



Optional properties :

- clock-frequency : Desired I2C bus clock frequency in Hz. If not specified,

  the default 100 kHz frequency will be used. As only Normal and Fast modes

  are supported, possible values are 100000 and 400000.

- st,i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is

  allowed through the deglitch circuit. In units of us.

- st,i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is

  allowed through the deglitch circuit. In units of us.

- A pinctrl state named "idle" could be defined to set pins in idle state

  when I2C instance is not performing a transfer.

- A pinctrl state named "sleep" could be defined to set pins in sleep state

  when driver enters in suspend.







Example :



i2c0: i2c@fed40000 {

	compatible	= "st,comms-ssc4-i2c";

	reg		= <0xfed40000 0x110>;

	interrupts	=  <GIC_SPI 187 IRQ_TYPE_LEVEL_HIGH>;

	clocks		= <&CLK_S_ICN_REG_0>;

	clock-names	= "ssc";

	clock-frequency = <400000>;

	pinctrl-names	= "default";

	pinctrl-0	= <&pinctrl_i2c0_default>;

	st,i2c-min-scl-pulse-width-us = <0>;

	st,i2c-min-sda-pulse-width-us = <5>;

};

drivers/i2c/busses/Kconfig

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@@ -702,6 +702,16 @@ config I2C_SIRF 
	  This driver can also be built as a module.  If so, the module

	  will be called i2c-sirf.



config I2C_ST

	tristate "STMicroelectronics SSC I2C support"

	depends on ARCH_STI

	help

	  Enable this option to add support for STMicroelectronics SoCs

	  hardware SSC (Synchronous Serial Controller) as an I2C controller.



	  This driver can also be built as module. If so, the module

	  will be called i2c-st.



config I2C_STU300

	tristate "ST Microelectronics DDC I2C interface"

	depends on MACH_U300

drivers/i2c/busses/Makefile

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@@ -69,6 +69,7 @@ obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o 
obj-$(CONFIG_I2C_SH_MOBILE)	+= i2c-sh_mobile.o

obj-$(CONFIG_I2C_SIMTEC)	+= i2c-simtec.o

obj-$(CONFIG_I2C_SIRF)		+= i2c-sirf.o

obj-$(CONFIG_I2C_ST)		+= i2c-st.o

obj-$(CONFIG_I2C_STU300)	+= i2c-stu300.o

obj-$(CONFIG_I2C_TEGRA)		+= i2c-tegra.o

obj-$(CONFIG_I2C_VERSATILE)	+= i2c-versatile.o

drivers/i2c/busses/i2c-st.c

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File added.

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