linux-kernel - Re: [RFT PATCH v2 03/14] arm64: dts: qcom: msm8996: switch TCSR mutex to MMIO

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Date:   Wed, 17 Aug 2022 22:59:35 +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 03/14] arm64: dts: qcom: msm8996: 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/msm8996-xiaomi-natrium.dtb: hwlock: 'reg' is a required property
>   qcom/msm8996-xiaomi-natrium.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/msm8996.dtsi | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8996.dtsi b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> index 3411ced96db6..166374566a49 100644
> --- a/arch/arm64/boot/dts/qcom/msm8996.dtsi
> +++ b/arch/arm64/boot/dts/qcom/msm8996.dtsi
> @@ -363,12 +363,6 @@ scm {
>  		};
>  	};
>  
> -	tcsr_mutex: hwlock {
> -		compatible = "qcom,tcsr-mutex";
> -		syscon = <&tcsr_mutex_regs 0 0x1000>;
> -		#hwlock-cells = <1>;
> -	};
> -
>  	memory@...00000 {
>  		device_type = "memory";
>  		/* We expect the bootloader to fill in the reg */
> @@ -838,9 +832,10 @@ pnoc: interconnect@...000 {
>  				 <&rpmcc RPM_SMD_PCNOC_A_CLK>;
>  		};
>  
> -		tcsr_mutex_regs: syscon@...000 {
> -			compatible = "syscon";
> +		tcsr_mutex: hwlock@...000 {
> +			compatible = "qcom,tcsr-mutex";
>  			reg = <0x00740000 0x20000>;
> +			#hwlock-cells = <1>;
>  		};
>  
>  		tcsr_1: sycon@...000 {