linux-kernel - Re: [PATCH 7/7] arm64: dts: qcom: sdm845: enable dma for spi

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Message-ID: <CAD=FV=UPNnSmgJM33QjAb4VvTe4Xs-OHcQCkk5E+o3u+afjbjA@mail.gmail.com>
Date:   Mon, 11 Jan 2021 08:47:01 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mark Brown <broonie@...nel.org>, Wolfram Sang <wsa@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        linux-spi <linux-spi@...r.kernel.org>, linux-i2c@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] arm64: dts: qcom: sdm845: enable dma for spi

Hi,

On Mon, Jan 11, 2021 at 7:18 AM Vinod Koul <vkoul@...nel.org> wrote:
>
> @@ -2622,6 +2626,13 @@ pinmux {
>                                                "gpio2", "gpio3";
>                                         function = "qup0";
>                                 };
> +
> +                               config {

Convention in Qualcomm device tree files seems to be that the node is
"pinconf", not "config".


> +                                       pins = "gpio0", "gpio1",
> +                                              "gpio2", "gpio3";
> +                                       drive-strength = <6>;
> +                                       bias-disable;
> +                               };

Pin config almost never belongs in the SoC dtsi file.  This should be
in the board .dts file.  What if pulls are needed on some pins?  What
if you need a stronger or weaker drive strength?

-Doug