linux-kernel - Re: [PATCH v5 1/4] i2c: busses: i2c-st: Add ST I2C controller

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Date:	Mon, 28 Oct 2013 14:25:04 -0500
From:	Kumar Gala <galak@...eaurora.org>
To:	Maxime COQUELIN <maxime.coquelin@...com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, srinivas.kandagatla@...com,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-i2c@...r.kernel.org, stephen.gallimore@...com,
	stuart.menefy@...com, Lee Jones <lee.jones@...aro.org>,
	gabriel.fernandez@...com
Subject: Re: [PATCH v5 1/4] i2c: busses: i2c-st: Add ST I2C controller


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@...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@...40000 {
> +	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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