linux-kernel - Re: [PATCH] arm64: dts: qcom: sc7280: Set modem FW path for Chrome OS boards

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Date:   Tue, 10 May 2022 12:49:30 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Joseph S . Barrera III" <joebar@...omium.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: sc7280: Set modem FW path for Chrome OS boards

Hi,

On Tue, May 10, 2022 at 10:47 AM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> Specify the path of the modem FW for SC7280 Chrome OS boards in
> the 'remoteproc_mpss' node.
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>
>  arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi b/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
> index 9f4a9c263c35..995c5bd12549 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280-chrome-common.dtsi
> @@ -89,6 +89,8 @@ &remoteproc_mpss {
>         compatible = "qcom,sc7280-mss-pil";
>         iommus = <&apps_smmu 0x124 0x0>, <&apps_smmu 0x488 0x7>;
>         memory-region = <&mba_mem>, <&mpss_mem>;
> +       firmware-name = "qcom/sc7280-herobrine/modem/mba.mbn",
> +                       "qcom/sc7280-herobrine/modem/qdsp6sw.mbn";

We don't necessarily need to change anything, but a few thoughts:

1. I guess technically we don't actually need the "modem" subdirectory
for herobrine, right? WiFi works differently on sc7280 so we won't
have a "no modem" modem firmware. ...but I guess it doesn't hurt to
have it and it's nice to keep it symmetric.

2. Whenever we're ready to support WiFi only SKUs then I guess it'll
still be OK to specify the firmware name. We'll just set the status of
"&mdss_dp" to "disabled".

3. It's slightly weird that we're using the name "herobrine" but
putting the change in the "chrome-common.dtsi" file. Should it be
"sc7280-chrome" instead?

-Doug