linux-kernel - Re: [PATCH V7 1/7] arm64: dts: sc7280: Add QSPI node

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Message-ID: <CAD=FV=XjjNx5UzgiKvONw+n0waGqgF+g7Qf4su9dvPQRS7uCrw@mail.gmail.com>
Date:   Fri, 3 Sep 2021 09:28:37 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Rajesh Patil <rajpat@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        msavaliy@....qualcomm.com, satya priya <skakit@...eaurora.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Roja Rani Yarubandi <rojay@...eaurora.org>
Subject: Re: [PATCH V7 1/7] arm64: dts: sc7280: Add QSPI node

Hi,

On Thu, Sep 2, 2021 at 9:29 PM Rajesh Patil <rajpat@...eaurora.org> wrote:
>
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -415,6 +415,25 @@
>                 method = "smc";
>         };
>
> +       qspi_opp_table: qspi-opp-table {
> +               compatible = "operating-points-v2";
> +
> +               opp-75000000 {
> +                       opp-hz = /bits/ 64 <75000000>;
> +                       required-opps = <&rpmhpd_opp_low_svs>;
> +               };
> +
> +               opp-150000000 {
> +                       opp-hz = /bits/ 64 <150000000>;
> +                       required-opps = <&rpmhpd_opp_svs>;
> +               };
> +

Any chance you could add a 200 MHz OPP point? It seems plausible that
we might want to run the Quad SPI bus at 50 MHz and this OPP needs to
be 4x that, so 200 MHz. ...or does it magically handle that case by
one of the other OPPs?

> +               opp-300000000 {
> +                       opp-hz = /bits/ 64 <300000000>;
> +                       required-opps = <&rpmhpd_opp_nom>;
> +               };
> +       };
> +
>         soc: soc@0 {
>                 #address-cells = <2>;
>                 #size-cells = <2>;
> @@ -1318,6 +1337,23 @@
>                         };
>                 };
>
> +               qspi: spi@...c000 {
> +                       compatible = "qcom,qspi-v1";

The above compatible should be:

compatible = "qcom,sdm7280-qspi", "qcom,qspi-v1";

...and you should fix the devicetree bindings to handle that. You
should also fix sc7180.

Technically the "qcom,sdm7280-qspi" isn't really needed to make
anything work today but having it is encouraged so that if we need to
deal with a quirk in the future we can easily do it. Also note that
your current dts will cause a bindings error because the current
bindings _require_ you to have two compatible strings.