linux-kernel - Re: [PATCH 16/19] arm64: dts: qcom: sdm845: Add "mhi" region to the PCIe nodes

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Message-ID: <1587de60-244a-d97f-dea0-36fe8a5be2c2@linaro.org>
Date:   Tue, 7 Mar 2023 09:20:23 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        andersson@...nel.org, lpieralisi@...nel.org, kw@...ux.com,
        krzysztof.kozlowski+dt@...aro.org, robh@...nel.org
Cc:     konrad.dybcio@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_srichara@...cinc.com
Subject: Re: [PATCH 16/19] arm64: dts: qcom: sdm845: Add "mhi" region to the
 PCIe nodes

On 06/03/2023 16:32, Manivannan Sadhasivam wrote:
> The "mhi" region contains the debug registers that could be used to monitor
> the PCIe link transitions.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 479859bd8ab3..0104e77dd8d5 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -2280,10 +2280,11 @@ opp-4 {
>  		pcie0: pci@...0000 {
>  			compatible = "qcom,pcie-sdm845";
>  			reg = <0 0x01c00000 0 0x2000>,
> +			      <0 0x01c07000 0 0x1000>,
>  			      <0 0x60000000 0 0xf1d>,
>  			      <0 0x60000f20 0 0xa8>,
>  			      <0 0x60100000 0 0x100000>;
> -			reg-names = "parf", "dbi", "elbi", "config";
> +			reg-names = "parf", "mhi", "dbi", "elbi", "config";

Indexes are fixed, thus this breaks other users of DTS.

Best regards,
Krzysztof