linux-kernel - Re: [PATCH v4 3/4] arm64: dts: meson: Add DDR PMU node

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Message-ID: <0fac4541-0d05-1076-487b-86a7b92da71e@amlogic.com>
Date:   Fri, 5 Aug 2022 17:57:43 +0800
From:   Jiucheng Xu <jiucheng.xu@...ogic.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>, <devicetree@...r.kernel.org>
CC:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v4 3/4] arm64: dts: meson: Add DDR PMU node


On 2022/8/5 16:22, Krzysztof Kozlowski wrote:
> [ EXTERNAL EMAIL ]
>
> On 05/08/2022 09:14, Jiucheng Xu wrote:
>> Add DDR PMU device node for G12 series SoC
>>
>> Signed-off-by: Jiucheng Xu <jiucheng.xu@...ogic.com>
>> ---
>> Changes v3 -> v4:
>>    - No change
>>
>> Changes v2 -> v3:
>>    - No change
>>
>> Changes v1 -> v2:
>>    - Remove model, dmc_nr, chann_nr properties
>>    - Add g12a-ddr-pmu, g12b-ddr-pmu, sm1-ddr-pmu compatibles as
>>      identifier
>> ---
>>   arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi | 7 +++++++
>>   arch/arm64/boot/dts/amlogic/meson-g12a.dtsi       | 4 ++++
>>   arch/arm64/boot/dts/amlogic/meson-g12b.dtsi       | 4 ++++
>>   arch/arm64/boot/dts/amlogic/meson-sm1.dtsi        | 4 ++++
>>   4 files changed, 19 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
>> index 45947c1031c4..7e556fe575be 100644
>> --- a/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi
>> @@ -2146,6 +2146,13 @@ hdmi_tx_out: endpoint {
>>   			};
>>   		};
>>   
>> +		ddr_pmu: ddr_pmu@...38000 {
> No underscores in node names.
>
> Node names should be generic, so pmu.
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
Okay, I will modify it.
>
>> +			compatible = "amlogic,g12-ddr-pmu";
>> +			reg = <0x0 0xff638000 0x0 0x100
>> +			       0x0 0xff638c00 0x0 0x100>;
>> +			interrupts = <GIC_SPI 52 IRQ_TYPE_EDGE_RISING>;
>> +		};
>> +
>>   		gic: interrupt-controller@...01000 {
>>   			compatible = "arm,gic-400";
>>   			reg = <0x0 0xffc01000 0 0x1000>,
>> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> index fb0ab27d1f64..4a32e081e70e 100644
>> --- a/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> +++ b/arch/arm64/boot/dts/amlogic/meson-g12a.dtsi
>> @@ -133,3 +133,7 @@ map1 {
>>   		};
>>   	};
>>   };
>> +
>> +&ddr_pmu {
>> +	compatible = "amlogic,g12a-ddr-pmu";
>> +};
> Adding nodes at the end causes conflicts. They should be added in some
> order...
Is alphabetical order okay?
>
> Best regards,
> Krzysztof
>
-- 
Thanks,
Jiucheng