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

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Date:	Tue, 29 Oct 2013 14:19:59 +0100
From:	Maxime Coquelin <maxime.coquelin@...com>
To:	Kumar Gala <galak@...eaurora.org>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Srinivas KANDAGATLA <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" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Stephen GALLIMORE <stephen.gallimore@...com>,
	Stuart MENEFY <stuart.menefy@...com>,
	Lee Jones <lee.jones@...aro.org>,
	Gabriel FERNANDEZ <gabriel.fernandez@...com>
Subject: Re: [PATCH v5 1/4] i2c: busses: i2c-st: Add ST I2C controller


On 10/28/2013 08:25 PM, Kumar Gala wrote:
> 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...
This was already discussed in earlier revisions of the patches.
Initially this was prefixed with "st,", but Wolfram asked to put these 
properties as generic.
As explained in the cover letter, there are no I2C DT binding 
documentation for now, but it is in Wolfram's ToDo list.
As soon as Wolfram has created the documentation, I will create a patch 
to document

i2c-min-scl-pulse-width-us and i2c-min-sda-pulse-width-us there.


>
>> +- 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
Right, I will correct that.

Thanks for the review,
Maxime
>
> - k
>

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