Re: [PATCH 1/3] dt-bindings: i2c: add optional mul-value property to binding

Wolfram Sang
2019-05-07T08:40:07Z

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On Thu, May 02, 2019 at 03:59:01PM -0500, Rob Herring wrote:
> On Tue, Apr 30, 2019 at 12:32:40PM +0800, Chuanhua Han wrote:
> > NXP Layerscape SoC have up to three MUL options available for all
> > divider values, we choice of MUL determines the internal monitor rate
> > of the I2C bus (SCL and SDA signals):
> > A lower MUL value results in a higher sampling rate of the I2C signals.
> > A higher MUL value results in a lower sampling rate of the I2C signals.
> >
> > So in Optional properties we added our custom mul-value property in the
> > binding to select which mul option for the device tree i2c controller
> > node.
> >
> > Signed-off-by: Chuanhua Han <chuanhua.han@nxp.com>
> > ---
> > Documentation/devicetree/bindings/i2c/i2c-imx.txt | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/i2c/i2c-imx.txt b/Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > index b967544590e8..ba8e7b7b3fa8 100644
> > --- a/Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > +++ b/Documentation/devicetree/bindings/i2c/i2c-imx.txt
> > @@ -18,6 +18,9 @@ Optional properties:
> > - sda-gpios: specify the gpio related to SDA pin
> > - pinctrl: add extra pinctrl to configure i2c pins to gpio function for i2c
> > bus recovery, call it "gpio" state
> > +- mul-value: NXP Layerscape SoC have up to three MUL options available for
> > +all I2C divider values, it describes which MUL we choose to use for the driver,
> > +the values should be 1,2,4.
>
> Needs a vendor prefix. I don't find 'value' to add anything nor do I
> understand what MUL is.
>
> If it is determined by SoC rather than board, then it should perhaps be
> implied by compatible.

I was wondering the same.

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