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

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Message-ID: <0c1ad8a7-a0a7-9a92-369c-3ede2ef82e58@linaro.org>
Date:   Wed, 8 Mar 2023 09:33:10 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     andersson@...nel.org, lpieralisi@...nel.org, kw@...ux.com,
        krzysztof.kozlowski+dt@...aro.org, robh@...nel.org,
        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 08/03/2023 09:31, Manivannan Sadhasivam wrote:
> On Tue, Mar 07, 2023 at 09:20:23AM +0100, Krzysztof Kozlowski wrote:
>> 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.
>>
> 
> Are you suggesting to move the "mhi" to the end and do not care about sorting?

Yes, any new entry must be added at the end. What sorting do you mean?
Entries are not sorted.


Best regards,
Krzysztof