linux-kernel - Re: [RFT PATCH v2 14/14] arm64: dts: qcom: sm8150: switch TCSR mutex to MMIO

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Message-ID: <4aea569f-38c1-953c-8293-25d6fb5e4477@linaro.org>
Date:   Thu, 18 Aug 2022 10:04:15 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...ainline.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 14/14] arm64: dts: qcom: sm8150: switch TCSR mutex
 to MMIO

On 18/08/2022 00:07, Konrad Dybcio wrote:
> 
> 
> 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/sm8150-mtp.dtb: hwlock: 'reg' is a required property
>>   qcom/sm8150-mtp.dtb: hwlock: 'syscon' does not match any of the regexes: 'pinctrl-[0-9]+'
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> ---
>>  arch/arm64/boot/dts/qcom/sm8150.dtsi | 13 ++++---------
>>  1 file changed, 4 insertions(+), 9 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8150.dtsi b/arch/arm64/boot/dts/qcom/sm8150.dtsi
>> index 7d509ecd44da..dc6770391813 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8150.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8150.dtsi
>> @@ -585,12 +585,6 @@ scm: 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 size */
>> @@ -2054,9 +2048,10 @@ ipa_virt: interconnect@...0000 {
>>  			qcom,bcm-voters = <&apps_bcm_voter>;
>>  		};
>>  
>> -		tcsr_mutex_regs: syscon@...0000 {
>> -			compatible = "syscon";
>> -			reg = <0x0 0x01f40000 0x0 0x40000>;
>> +		tcsr_mutex: hwlock@...0000 {
>> +			compatible = "qcom,tcsr-mutex";
>> +			reg = <0 0x01f40000 0 0x20000>;
>> +			#hwlock-cells = <1>;
>>  		};
> No replacement for the trailing 0x20000?
> 

There is no user of it, so I did not add. I could add remaining block
just for completeness.


Best regards,
Krzysztof