linux-kernel - Re: [PATCH v1 5/5] riscv: dts: starfive: Add JH7110 PWM-DAC support

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Message-ID: <16813f18-2188-ad9d-9c06-6bbc845b9d99@starfivetech.com>
Date:   Fri, 30 Jun 2023 10:12:05 +0800
From:   Hal Feng <hal.feng@...rfivetech.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor@...nel.org>,
        "Walker Chen" <walker.chen@...rfivetech.com>,
        Xingyu Wu <xingyu.wu@...rfivetech.com>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>
CC:     <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 5/5] riscv: dts: starfive: Add JH7110 PWM-DAC support

On Mon, 26 Jun 2023 17:37:35 +0200, Krzysztof Kozlowski wrote:
> On 26/06/2023 13:09, Hal Feng wrote:
>> Add PWM-DAC support for StarFive JH7110 SoC.
>> 
>> Signed-off-by: Hal Feng <hal.feng@...rfivetech.com>
>> ---
>>  .../jh7110-starfive-visionfive-2.dtsi         | 50 +++++++++++++++++++
>>  arch/riscv/boot/dts/starfive/jh7110.dtsi      | 13 +++++
>>  2 files changed, 63 insertions(+)
>> 
>> diff --git a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi
>> index 19b5954ee72d..5ca66a65e722 100644
>> --- a/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi
>> +++ b/arch/riscv/boot/dts/starfive/jh7110-starfive-visionfive-2.dtsi
>> @@ -36,6 +36,34 @@ gpio-restart {
>>  		gpios = <&sysgpio 35 GPIO_ACTIVE_HIGH>;
>>  		priority = <224>;
>>  	};
>> +
>> +	pwmdac_dit: pwmdac-dit {
>> +		compatible = "starfive,jh7110-pwmdac-dit";
>> +		#sound-dai-cells = <0>;
>> +	};
>> +
>> +	sound {
>> +		compatible = "simple-audio-card";
>> +		simple-audio-card,name = "StarFive-PWMDAC-Sound-Card";
>> +		#address-cells = <1>;
>> +		#size-cells = <0>;
>> +
>> +		simple-audio-card,dai-link@0 {
>> +			reg = <0>;
>> +			format = "left_j";
>> +			bitclock-master = <&sndcpu0>;
>> +			frame-master = <&sndcpu0>;
>> +			status = "okay";
> 
> Drop

OK.

> 
>> +
>> +			sndcpu0: cpu {
>> +				sound-dai = <&pwmdac>;
>> +			};
>> +
>> +			codec {
>> +				sound-dai = <&pwmdac_dit>;
> 
> You said it is a transmitter, not a codec...

It is a dummy codec, also known as a dummy transmitter.

Best regards,
Hal