linux-kernel - Re: [PATCH v3 2/2] spi: meson-spicc: Use pinctrl to drive CLK line when idle

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Date:   Wed, 19 Oct 2022 22:50:29 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Amjad Ouled-Ameur <aouledameur@...libre.com>
Cc:     Mark Brown <broonie@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh+dt@...nel.org>, Da Xue <da@...re.computer>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] spi: meson-spicc: Use pinctrl to drive CLK line
 when idle

Hi Amjad,

On Wed, Oct 19, 2022 at 4:03 PM Amjad Ouled-Ameur
<aouledameur@...libre.com> wrote:
[...]
> diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
> index c3ac531c4f84..04e9d0f1bde0 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
> +++ b/arch/arm64/boot/dts/amlogic/meson-gxl.dtsi
> @@ -429,6 +429,20 @@ mux {
>                         };
>                 };
>
> +               spi_idle_high_pins: spi-idle-high-pins {
> +                       mux {
> +                               groups = "spi_sclk";
> +                               bias-pull-up;
> +                       };
> +               };
> +
> +               spi_idle_low_pins: spi-idle-low-pins {
> +                       mux {
> +                               groups = "spi_sclk";
> +                               bias-pull-down;
> +                       };
> +               };
> +
We typically have the .dts{,i} changes in a separate patch. I suggest
doing the same here.
I also have two questions about this part:
- why are these not referenced by the SPICC controller node?
- is there a particular reason why meson-gxl.dtsi is updated but
meson-gxbb.dtsi is not? (my understanding is that GXBB is also lacking
hardware OEN support)


Best regards,
Martin