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SubjectRe: [PATCH v5 1/4] i2c: busses: i2c-st: Add ST I2C controller
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On Oct 14, 2013, at 7:46 AM, Maxime COQUELIN wrote:

> 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: Maxime Coquelin <maxime.coquelin@st.com>
> ---
> Documentation/devicetree/bindings/i2c/i2c-st.txt | 38 +
> drivers/i2c/busses/Kconfig | 10 +
> drivers/i2c/busses/Makefile | 1 +
> drivers/i2c/busses/i2c-st.c | 867 ++++++++++++++++++++++
> 4 files changed, 916 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/i2c/i2c-st.txt
> create mode 100644 drivers/i2c/busses/i2c-st.c
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-st.txt b/Documentation/devicetree/bindings/i2c/i2c-st.txt
> new file mode 100644
> index 0000000..8b2fd0b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-st.txt
> @@ -0,0 +1,38 @@
> +ST SSC binding, for I2C mode operation
> +
> +Required properties :
> +- compatible : Must be "st,comms-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, using the bindings in
> + ../pinctrl/pinctrl-binding.txt
> +
> +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.
> +- i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is
> + allowed through the deglitch circuit. In units of us.
> +- i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is
> + allowed through the deglitch circuit. In units of us.

i2c-min... should be vendor prefixed, st,i2c-min...

> +- A pinctrl state named "sleep" could be defined, using the bindings in
> + ../pinctrl/pinctrl-binding.txt

I don't see any reference to "sleep" in pinctrl-binding.txt

> +
> +
> +Example :
> +
> +i2c0: i2c@fed40000 {
> + compatible = "st,comms-ssc-i2c";
> + reg = <0xfed40000 0x110>;
> + interrupts = <GIC_SPI 187 IRQ_TYPE_EDGE_RISING>;
> + clocks = <&CLK_S_ICN_REG_0>;
> + clock-names = "ssc";
> + clock-frequency = <400000>;
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_i2c0_default>;
> + i2c-min-scl-pulse-width-us = <0>;
> + i2c-min-sda-pulse-width-us = <5>;
> +};

- k

--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation



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