linux-kernel - Re: [PATCH v2 05/16] arm64: dts: mediatek: mt8183-evb: Couple VGPU and VSRAM

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Date:   Fri, 24 Feb 2023 17:54:05 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     matthias.bgg@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 05/16] arm64: dts: mediatek: mt8183-evb: Couple VGPU
 and VSRAM_GPU regulators

On Thu, Feb 23, 2023 at 9:43 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Add coupling for these regulators, as they have a strict voltage output
> relation to satisfy in order to ensure GPU stable operation.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
>  arch/arm64/boot/dts/mediatek/mt8183-evb.dts | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-evb.dts b/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> index 52dc4a50e34d..fd327437e932 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> +++ b/arch/arm64/boot/dts/mediatek/mt8183-evb.dts
> @@ -52,7 +52,6 @@ &auxadc {
>
>  &gpu {
>         mali-supply = <&mt6358_vgpu_reg>;
> -       sram-supply = <&mt6358_vsram_gpu_reg>;
>  };
>
>  &i2c0 {
> @@ -138,6 +137,16 @@ &mmc1 {
>         non-removable;
>  };
>
> +&mt6358_vgpu_reg {
> +       regulator-coupled-with = <&mt6358_vsram_gpu_reg>;
> +       regulator-coupled-max-spread = <100000>;
> +};
> +
> +&mt6358_vsram_gpu_reg {
> +       regulator-coupled-with = <&mt6358_vgpu_reg>;
> +       regulator-coupled-max-spread = <100000>;

Should we also fix up the constraints?

ChenYu

> +};
> +
>  &pio {
>         i2c_pins_0: i2c0{
>                 pins_i2c{
> --
> 2.39.2
>