linux-kernel - Re: [PATCH v3 10/15] ARM: dts: qcom: msm8974: split TCSR halt regs out of mutex

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Date:   Tue, 13 Sep 2022 17:44:18 -0500
From:   Bjorn Andersson <andersson@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 10/15] ARM: dts: qcom: msm8974: split TCSR halt regs
 out of mutex

On Fri, Sep 09, 2022 at 11:20:30AM +0200, Krzysztof Kozlowski wrote:
[..]
> diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi b/arch/arm/boot/dts/qcom-msm8974.dtsi
> index 90a6d4b7605c..ada232bed2c8 100644
> --- a/arch/arm/boot/dts/qcom-msm8974.dtsi
> +++ b/arch/arm/boot/dts/qcom-msm8974.dtsi
> @@ -1189,7 +1189,7 @@ remoteproc_mss: remoteproc@...80000 {
>  			resets = <&gcc GCC_MSS_RESTART>;
>  			reset-names = "mss_restart";
>  
> -			qcom,halt-regs = <&tcsr_mutex_block 0x1180 0x1200 0x1280>;
> +			qcom,halt-regs = <&tcsr_1 0x180 0x200 0x280>;
>  
>  			qcom,smem-states = <&modem_smp2p_out 0>;
>  			qcom,smem-state-names = "stop";
> @@ -1230,10 +1230,15 @@ smd-edge {
>  
>  		tcsr_mutex_block: syscon@...84000 {
>  			compatible = "syscon";
> -			reg = <0xfd484000 0x2000>;
> +			reg = <0xfd484000 0x1000>;
>  		};
>  
> -		tcsr: syscon@...a0000 {
> +		tcsr_1: syscon@...85000 {

While the accessed registers look general purpose in nature, I would
prefer that we stick with naming it based on the register blocks - and
this is part of what's named "tcsr_mutex".

Is it not possible to claim that this region is a
"qcom,msm8974-tcsr-mutex" and a "syscon"?

> +			compatible = "qcom,tcsr-msm8974", "syscon";
> +			reg = <0xfd485000 0x1000>;
> +		};
> +
> +		tcsr_2: syscon@...a0000 {

And I would like to keep this as "tcsr".

Regards,
Bjorn