linux-kernel - Re: [PATCH V4 3/4] arm64: dts: sc7280: Update QUPv3 Debug UART DT node

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Date:   Wed, 11 Aug 2021 17:34:41 +0530
From:   rajpat@...eaurora.org
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, rnayak@...eaurora.org,
        saiprakash.ranjan@...eaurora.org, msavaliy@....qualcomm.com,
        skakit@...eaurora.org, Roja Rani Yarubandi <rojay@...eaurora.org>,
        swboyd@...omium.org
Subject: Re: [PATCH V4 3/4] arm64: dts: sc7280: Update QUPv3 Debug UART DT
 node

On 2021-07-26 21:12, Matthias Kaehlcke wrote:
> On Mon, Jul 26, 2021 at 07:10:46PM +0530, Rajesh Patil wrote:
>> From: Roja Rani Yarubandi <rojay@...eaurora.org>
>> 
>> Update QUPv3 Debug UART DT node with the interconnect names and
>> functions for SC7280 SoC.
>> 
>> Split the Debug UART pin control functions.
>> 
>> Signed-off-by: Roja Rani Yarubandi <rojay@...eaurora.org>
>> Signed-off-by: Rajesh Patil <rajpat@...eaurora.org>
>> ---
>> Changes in V4:
>>  - As per Bjorn's comment, posting this debug-uart node update
>>    as seperate patch
>> 
>>  arch/arm64/boot/dts/qcom/sc7280-idp.dts | 18 +++++++-----------
>>  arch/arm64/boot/dts/qcom/sc7280.dtsi    | 28 
>> ++++++++++++++++++++++++----
>>  2 files changed, 31 insertions(+), 15 deletions(-)
>> 
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dts 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> index f63cf51..a50c9e5 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> @@ -383,18 +383,14 @@
>>  	bias-pull-up;
>>  };
>> 
>> -&qup_uart5_default {
>> -	tx {
>> -		pins = "gpio46";
>> -		drive-strength = <2>;
>> -		bias-disable;
>> -	};
>> +&qup_uart5_tx {
>> +	drive-strength = <2>;
>> +	bias-disable;
>> +};
>> 
>> -	rx {
>> -		pins = "gpio47";
>> -		drive-strength = <2>;
>> -		bias-pull-up;
>> -	};
>> +&qup_uart5_rx {
>> +	drive-strength = <2>;
>> +	bias-pull-up;
>>  };
>> 
>>  &sdc1_on {
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi 
>> b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> index 455e58f..951818f 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> @@ -853,8 +853,13 @@
>>  				clock-names = "se";
>>  				clocks = <&gcc GCC_QUPV3_WRAP0_S5_CLK>;
>>  				pinctrl-names = "default";
>> -				pinctrl-0 = <&qup_uart5_default>;
>> +				pinctrl-0 = <&qup_uart5_cts>, <&qup_uart5_rts>, <&qup_uart5_tx>, 
>> <&qup_uart5_rx>;
>>  				interrupts = <GIC_SPI 606 IRQ_TYPE_LEVEL_HIGH>;
>> +				power-domains = <&rpmhpd SC7280_CX>;
>> +				operating-points-v2 = <&qup_opp_table>;
>> +				interconnects = <&clk_virt MASTER_QUP_CORE_0 0 &clk_virt 
>> SLAVE_QUP_CORE_0 0>,
>> +						<&gem_noc MASTER_APPSS_PROC 0 &cnoc2 SLAVE_QUP_0 0>;
>> +				interconnect-names = "qup-core", "qup-config";
> 
> 
> Most of the above should be added by patch '[2/4] arm64: dts: sc7280: 
> Add QUPv3
> wrapper_0 nodes'.

Based on the comments on v3 [1], I have added this as a separate patch
[1] https://lore.kernel.org/patchwork/patch/1441257/

> 
> I have to say I dislike that the SoC DT file dictates which UART to use 
> for
> the serial console. Technically it could be any of them, right? uart5 
> is
> used because that's what the IDP does, and the rest of the world is 
> expected
> to follow. Why not configure uart5 as "qcom,geni-uart" by default and
> overwrite the compatible string and pinctrl in the board file? You 
> could even
> add 'qup-uartN-all' (or similar) pinconfigs to sc7280.dtsi, which would 
> make
> the changes in the board file trivial.

Okay, will make the compatible as "qcom,geni-uart" in SoC dt and later 
modify it in idp dts as "qcom,geni-debug-uart".

Thanks,
Rajesh