linux-kernel - Re: [RFT PATCH v2 11/14] arm64: dts: qcom: sdm845: switch TCSR mutex to MMIO

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Message-ID: <b2e13fc0-fb25-de2f-4794-95a0f5b8c878@somainline.org>
Date:   Wed, 17 Aug 2022 23:04:07 +0200
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFT PATCH v2 11/14] arm64: dts: qcom: sdm845: switch TCSR mutex
 to MMIO



On 17.08.2022 15:03, Krzysztof Kozlowski wrote:
> The TCSR mutex bindings allow device to be described only with address
> space (so it uses MMIO, not syscon regmap).  This seems reasonable as
> TCSR mutex is actually a dedicated IO address space and it also fixes DT
> schema checks:
> 
>   qcom/sdm845-shift-axolotl.dtb: hwlock: 'reg' is a required property
>   qcom/sdm845-shift-axolotl.dtb: hwlock: 'syscon' does not match any of the regexes: 'pinctrl-[0-9]+'
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> ---
Not tested on a device, but looks good to the eye:
Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>

Konrad
>  arch/arm64/boot/dts/qcom/sdm845.dtsi | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> index 21ed14200986..bd0ec0664283 100644
> --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
> @@ -919,12 +919,6 @@ compute-cb@8 {
>  		};
>  	};
>  
> -	tcsr_mutex: hwlock {
> -		compatible = "qcom,tcsr-mutex";
> -		syscon = <&tcsr_mutex_regs 0 0x1000>;
> -		#hwlock-cells = <1>;
> -	};
> -
>  	smp2p-cdsp {
>  		compatible = "qcom,smp2p";
>  		qcom,smem = <94>, <432>;
> @@ -2588,9 +2582,10 @@ ipa: ipa@...0000 {
>  			status = "disabled";
>  		};
>  
> -		tcsr_mutex_regs: syscon@...0000 {
> -			compatible = "syscon";
> +		tcsr_mutex: hwlock@...0000 {
> +			compatible = "qcom,tcsr-mutex";
>  			reg = <0 0x01f40000 0 0x20000>;
> +			#hwlock-cells = <1>;
>  		};
>  
>  		tcsr_regs_1: sycon@...0000 {