linux-kernel - Re: [PATCH v4 1/3] i2c: cadence: Document device tree bindings

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Date:	Thu, 3 Apr 2014 14:51:09 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Wolfram Sang <wsa@...-dreams.de>,
	Grant Likely <grant.likely@...aro.org>,
	Michal Simek <michal.simek@...inx.com>,
	Mike Looijmans <mike.looijmans@...ic.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Harini Katakam <harinik@...inx.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH v4 1/3] i2c: cadence: Document device tree bindings

On Thu, Apr 3, 2014 at 12:59 PM, Soren Brinkmann
<soren.brinkmann@...inx.com> wrote:
> Add device tree binding documentation for the Cadence I2C controller.
>
> Signed-off-by: Soren Brinkmann <soren.brinkmann@...inx.com>
> ---
>
> Changes in v4:
>  - moved adding DT docs into this dedicated patch
>
> Changes in v3: None
> Changes in v2: None
>
> ---
>  .../devicetree/bindings/i2c/i2c-cadence.txt         | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-cadence.txt
>
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-cadence.txt b/Documentation/devicetree/bindings/i2c/i2c-cadence.txt
> new file mode 100644
> index 000000000000..685adf513111
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-cadence.txt
> @@ -0,0 +1,21 @@
> +Binding for the Cadence I2C controller
> +
> +Required properties:
> +  compatible: Compatibility string. Must be 'cdns,i2c-r1p10'.
> +  clocks: From common clock bindings. Phandle to input clock.
> +
> +Optional properties:
> +  clock-frequency: Desired operating frequency, in Hz, of the bus (actual may
> +                  be lower). Defaults to 400000 if not specified.

Since not all devices support 400kHz, I would prefer that the default
be 100kHz. Also, it would be good if what speed the default is
consistent across i2c drivers.

Rob
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