linux-kernel - Re: [PATCH] dt-bindings: soc: qcom: Fix default clock-freq for qcom,geni-i2c

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Date:   Fri, 22 Jun 2018 09:51:35 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     andy.gross@...aro.org, kramasub@...eaurora.org, wsa@...-dreams.de,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Mark Rutland <mark.rutland@....com>, linux-soc@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: soc: qcom: Fix default clock-freq for
 qcom,geni-i2c

On Wed 13 Jun 10:50 PDT 2018, Douglas Anderson wrote:

> In an early version of the I2C patch that was posted to the list the
> default I2C frequency (if none was specified) was 400 kHz.  There was
> debate on the list and we decided that it would be more consistent
> with the rest of i2c if we defaulted to 100 kHz.  ...but we never
> updated the bindings.  Let's fix this.
> 
> NOTE: since the i2c driver itself hasn't actually landed yet and the
> SoC here is very new it seems terribly unlikely that anyone was
> relying on the old 400 kHz number, so I'll assume this is an OK
> "incompatible" device tree change.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
> 
>  Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
> index d330c73de9a2..68b7d6207e3d 100644
> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,geni-se.txt
> @@ -39,7 +39,7 @@ Required properties:
>  
>  Optional property:
>  - clock-frequency:	Desired I2C bus clock frequency in Hz.
> -			When missing default to 400000Hz.
> +			When missing default to 100000Hz.
>  
>  Child nodes should conform to I2C bus binding as described in i2c.txt.
>  
> -- 
> 2.18.0.rc1.244.gcf134e6275-goog
>