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Date:   Mon, 8 Aug 2022 09:52:21 +0200
From:   Marco Felsch <m.felsch@pengutronix.de>
To:     Shenwei Wang <shenwei.wang@nxp.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        "robh+dt@kernel.org" <robh+dt@kernel.org>,
        "krzysztof.kozlowski+dt@linaro.org" 
        <krzysztof.kozlowski+dt@linaro.org>,
        "linus.walleij@linaro.org" <linus.walleij@linaro.org>,
        "brgl@bgdev.pl" <brgl@bgdev.pl>,
        "shawnguo@kernel.org" <shawnguo@kernel.org>,
        "s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
        "kernel@pengutronix.de" <kernel@pengutronix.de>,
        "festevam@gmail.com" <festevam@gmail.com>,
        dl-linux-imx <linux-imx@nxp.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>
Subject: Re: [EXT] Re: [PATCH v1 2/3] dt-bindings: firmware: imx: Add imx-scu
 gpio node
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On 22-08-05, Shenwei Wang wrote:
> 
> 
> > -----Original Message-----
> > From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> > Sent: Friday, August 5, 2022 1:56 AM
> > To: Shenwei Wang <shenwei.wang@nxp.com>; robh+dt@kernel.org;
> > krzysztof.kozlowski+dt@linaro.org; linus.walleij@linaro.org; brgl@bgdev.pl;
> > shawnguo@kernel.org; s.hauer@pengutronix.de; kernel@pengutronix.de;
> > festevam@gmail.com; dl-linux-imx <linux-imx@nxp.com>
> > Cc: devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; linux-
> > gpio@vger.kernel.org; linux-arm-kernel@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@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