linux-kernel - Re: [PATCH v2 1/7] arm64: dts: qcom: sm8450: add spmi node

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Message-ID: <ee24809b-cf9b-c555-9c30-956949be25a4@linaro.org>
Date:   Thu, 29 Dec 2022 11:57:58 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org
Cc:     marijn.suijten@...ainline.org, Vinod Koul <vkoul@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] arm64: dts: qcom: sm8450: add spmi node

On 29/12/2022 11:45, Konrad Dybcio wrote:
> 
> 
> On 29.12.2022 11:42, Krzysztof Kozlowski wrote:
>> On 29/12/2022 11:32, Konrad Dybcio wrote:
>>> From: Vinod Koul <vkoul@...nel.org>
>>>
>>> Add the spmi bus as found in the SM8450 SoC
>>>
>>> Signed-off-by: Vinod Koul <vkoul@...nel.org>
>>> Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
>>> [Konrad: 0x0 -> 0, move #cells down, make reg-names a vertical list]
>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>>> ---
>>> v1 -> v2:
>>> No changes
>>>
>>>  arch/arm64/boot/dts/qcom/sm8450.dtsi | 22 ++++++++++++++++++++++
>>>  1 file changed, 22 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sm8450.dtsi b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>>> index 570475040d95..b9b59c5223eb 100644
>>> --- a/arch/arm64/boot/dts/qcom/sm8450.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sm8450.dtsi
>>> @@ -2715,6 +2715,28 @@ aoss_qmp: power-controller@...0000 {
>>>  			#clock-cells = <0>;
>>>  		};
>>>  
>>> +		spmi_bus: spmi@...d000 {
>>
>> Hmm looks different than reg.
>>
>>> +			compatible = "qcom,spmi-pmic-arb";
>>> +			reg = <0 0x0c400000 0 0x00003000>,
>>> +			      <0 0x0c500000 0 0x00400000>,
>>> +			      <0 0x0c440000 0 0x00080000>,
>>> +			      <0 0x0c4c0000 0 0x00010000>,
>>> +			      <0 0x0c42d000 0 0x00010000>;
>> x
> Hm, my guess would be that Vinod chose to put the "cnfg" reg
> instead of "core" in the unit address, as 8450 has 2 SPMI bus
> hosts and they both share the core reg, so it would have been
> impossible to have two spmi@...e nodes..

Eh? SM8450 has 2 SPMI hosts both using 0x0c400000? How does that work?
Usually address can be mapped only once.

Where is the second SPMI? I cannot find it in linux-next.


Best regards,
Krzysztof