[EXT] Re: [PATCH v1 2/3] dt-bindings: firmware: imx: Add imx-scu gpio node

[Marco Felsch]

On 22-08-05, Shenwei Wang wrote:
> 
> 
> > -----Original Message-----
> > From: Krzysztof Kozlowski <krzysztof.kozlowski at linaro.org>
> > Sent: Friday, August 5, 2022 1:56 AM
> > To: Shenwei Wang <shenwei.wang at nxp.com>; robh+dt at kernel.org;
> > krzysztof.kozlowski+dt at linaro.org; linus.walleij at linaro.org; brgl at bgdev.pl;
> > shawnguo at kernel.org; s.hauer at pengutronix.de; kernel at pengutronix.de;
> > festevam at gmail.com; dl-linux-imx <linux-imx at nxp.com>
> > Cc: devicetree at vger.kernel.org; linux-kernel at vger.kernel.org; linux-
> > gpio at vger.kernel.org; linux-arm-kernel at lists.infradead.org
> > Subject: [EXT] Re: [PATCH v1 2/3] dt-bindings: firmware: imx: Add imx-scu gpio
> > node
> > 
> > Caution: EXT Email
> > 
> > On 04/08/2022 20:49, Shenwei Wang wrote:
> > > Add the description for imx-scu gpio subnode.
> > >
> > > Signed-off-by: Shenwei Wang <shenwei.wang at nxp.com>
> > > ---
> > >  Documentation/devicetree/bindings/firmware/fsl,scu.yaml | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
> > b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
> > > index b40b0ef56978..080955b6edd8 100644
> > > --- a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
> > > +++ b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
> > > @@ -30,6 +30,11 @@ properties:
> > >        Clock controller node that provides the clocks controlled by the SCU
> > >      $ref: /schemas/clock/fsl,scu-clk.yaml
> > >
> > > +  gpio:
> > > +    description:
> > > +      GPIO control over the SCU firmware APIs
> > 
> > I don't understand this description. How GPIO can control some API?
> 
> How about change to "Control the GPIO PINs on SCU domain over the firmware APIs"?

For linux it doesn't matter how the GPIOs are controlled. They can be
controlled by a co-processor like this SCU or by an I2C expander or they
are native, the list goes on. All those details are hidden.

Regards,
  Marco

> 
> Thanks,
> Shenwei
> 
> > 
> > Best regards,
> > Krzysztof