Re: [PATCH 1/2] i2c: designware: device tree bindings for i2c speed mode

[Wolfram Sang <wsa@the-dreams.de>]

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On Tue, Aug 19, 2014 at 01:34:35PM -0500, atull@opensource.altera.com wrote:
> From: Alan Tull <atull@opensource.altera.com>
> 
> Add "speed-mode" Device Tree property to select between
> standard and fast i2c mode.  Previously, driver was hardwired
> as fast mode.  Default to fast mode if property is not
> present.

NACK. This should be deduced from the clock-frequency setting...

> 
> Signed-off-by: Alan Tull <atull@opensource.altera.com>
> ---
>  .../devicetree/bindings/i2c/i2c-designware.txt     |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> index 5199b0c..0e4cd21 100644
> --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
> @@ -9,6 +9,8 @@ Required properties :
>  Recommended properties :
>  
>   - clock-frequency : desired I2C bus clock frequency in Hz.

... which is described here, but surprisingly not supported in the
driver yet :(

Check i2c-riic for an example.

> + - speed-mode      : 0 = standard (0 - 100Kb/s)
> +                   : 1 = fast (<= 400Kb/s) <== default
>  
>  Optional properties :
>   - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
> @@ -29,6 +31,7 @@ Example :
>  		reg = <0xf0000 0x1000>;
>  		interrupts = <11>;
>  		clock-frequency = <400000>;
> +		speed-mode = <0>;
>  	};
>  
>  	i2c@1120000 {
> -- 
> 1.7.9.5
> 

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