linux-kernel - Re: [PATCH v2,2/2] arm64: dts: mediatek: mt8183: set bus rx width to disable quad mode

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Date:   Wed, 16 Aug 2023 18:47:20 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Tudor Ambarus <tudor.ambarus@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bjorn Andersson <andersson@...nel.org>
Cc:     Pratyush Yadav <pratyush@...nel.org>,
        Michael Walle <michael@...le.cc>,
        "Miquel Raynal )" <miquel.raynal@...tlin.com>,
        "Richard Weinberger )" <richard@....at>,
        "Vignesh Raghavendra )" <vigneshr@...com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        cros-qcom-dts-watchers@...omium.org,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: Re: [PATCH v2,2/2] arm64: dts: mediatek: mt8183: set bus rx width to
 disable quad mode

On Wed, Aug 16, 2023 at 6:42 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> Some of the SKUs are using gigadevice gd25lq64c flash chip. The chip
> default enables quad mode, which results in the write protect pin set to
> IO pin. In mt8183 kukui, we won't use quad enable for all SKUs, so apply
> the property to disable spi nor's quad mode.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
change log:
v1->v2: use existing property.
v1 link: https://lore.kernel.org/lkml/20230815154412.713846-1-hsinyi@chromium.org/
---
>  arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> index 6ce16a265e053..ef472b522f2e7 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi
> @@ -877,6 +877,7 @@ w25q64dw: flash@0 {
>                 compatible = "winbond,w25q64dw", "jedec,spi-nor";
>                 reg = <0>;
>                 spi-max-frequency = <25000000>;
> +               spi-rx-bus-width = <2>;
>         };
>  };
>
> --
> 2.41.0.694.ge786442a9b-goog
>