Re: [PATCH 4/4] arm64: dts: qcom: sc7180: disable quad mode for spi nor

[Doug Anderson]

Hi,


On Tue, Aug 15, 2023 at 8:45 AM Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> 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 trogdor platforms, 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@xxxxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> index 5a33e16a8b677..0806ce8e86bea 100644
> --- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
> @@ -436,6 +436,7 @@ flash@0 {
>                 spi-max-frequency = <37500000>;
>                 spi-tx-bus-width = <2>;
>                 spi-rx-bus-width = <2>;
> +               disable-quad-mode;

This seems unnecessary. Unless "tx-bus-width" or "rx-bus-width" is 4
then Quad SPI isn't enabled. You don't need an explicit property since
this can just be inferred from the tx and rx bus width.

-Doug