linux-kernel - Re: [PATCH v1 2/4] arm64: dts: qcom: sc7280: Add 'piglin' to the crd-r3 compatible strings

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Date:   Mon, 21 Mar 2022 11:14:56 +0530
From:   Rajendra Nayak <quic_rjendra@...cinc.com>
To:     Matthias Kaehlcke <mka@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>
CC:     Stephen Boyd <swboyd@...omium.org>, <devicetree@...r.kernel.org>,
        "Douglas Anderson" <dianders@...omium.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/4] arm64: dts: qcom: sc7280: Add 'piglin' to the
 crd-r3 compatible strings


On 3/17/2022 5:58 AM, Matthias Kaehlcke wrote:
> With newer bootloader versions the crd-r3 (aka CRD 1.0 and 2.0) is
> identified as a 'piglin' board (like the IDP2 board), instead of 'hoglin'
> Add the compatible strings 'google,piglin-rev{3,4}'. The hoglin entries
> are kept to make sure the board keeps booting with older bootloader
> versions.

The older bootloaders really look for the google,hoglin-rev3/google,hoglin-rev4
compatibles or just google,hoglin? If its just google,hoglin, won;t it pick the
crd-rev5+ dtb now?

> 
> The compatible string 'google,piglin' (without revision information) is
> still used by the IDP2 board, which is not expected to evolve further.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> 
>   arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts b/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts
> index 7a028b9248c3..344338ad8a01 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7280-crd-r3.dts
> @@ -12,7 +12,10 @@
>   
>   / {
>   	model = "Qualcomm Technologies, Inc. sc7280 CRD platform (rev3 - 4)";
> -	compatible = "qcom,sc7280-crd", "google,hoglin-rev3", "google,hoglin-rev4", "qcom,sc7280";
> +	compatible = "qcom,sc7280-crd",
> +		     "google,hoglin-rev3", "google,hoglin-rev4",
> +		     "google,piglin-rev3", "google,piglin-rev4",
> +		     "qcom,sc7280";
>   
>   	aliases {
>   		serial0 = &uart5;