linux-kernel - Re: [PATCH v1 3/3] riscv: dts: starfive: add tdm node and sound card

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Message-ID: <2d5a8dae-73fd-b1f8-089e-041637d66b0d@starfivetech.com>
Date:   Thu, 30 Mar 2023 23:16:08 +0800
From:   Walker Chen <walker.chen@...rfivetech.com>
To:     Conor Dooley <conor.dooley@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v1 3/3] riscv: dts: starfive: add tdm node and sound card



On 2023/3/30 15:58, Conor Dooley wrote:
> On Thu, Mar 30, 2023 at 09:43:10AM +0200, Krzysztof Kozlowski wrote:
>> On 29/03/2023 17:33, Walker Chen wrote:
>> > Add the tdm controller node and sound card for the StarFive JH7110 SoC.
> 
>> > +		compatible = "fixed-clock";
>> > +		clock-output-names = "wm8960_mclk";
>> > +		#clock-cells = <0>;
>> > +	};
>> > +
>> >  	i2srx_bclk_ext: i2srx-bclk-ext-clock {
>> >  		compatible = "fixed-clock";
>> >  		clock-output-names = "i2srx_bclk_ext";
>> > @@ -375,6 +381,27 @@
>> >  			status = "disabled";
>> >  		};
>> >  
>> > +		tdm: tdm@...90000 {
>> > +			compatible = "starfive,jh7110-tdm";
>> > +			reg = <0x0 0x10090000 0x0 0x1000>;
>> > +			clocks = <&syscrg JH7110_SYSCLK_TDM_AHB>,
>> > +				 <&syscrg JH7110_SYSCLK_TDM_APB>,
>> > +				 <&syscrg JH7110_SYSCLK_TDM_INTERNAL>,
>> > +				 <&syscrg JH7110_SYSCLK_TDM_TDM>,
>> > +				 <&syscrg JH7110_SYSCLK_MCLK_INNER>,
>> > +				 <&tdm_ext>;
>> > +			clock-names = "tdm_ahb", "tdm_apb",
>> > +				      "tdm_internal", "tdm",
>> > +				      "mclk_inner", "tdm_ext";
>> > +			resets = <&syscrg JH7110_SYSRST_TDM_AHB>,
>> > +				 <&syscrg JH7110_SYSRST_TDM_APB>,
>> > +				 <&syscrg JH7110_SYSRST_TDM_CORE>;
>> > +			dmas = <&dma 20>, <&dma 21>;
>> > +			dma-names = "rx","tx";
>> > +			#sound-dai-cells = <0>;
>> > +			status = "disabled";
>> > +		};
>> > +
>> >  		stgcrg: clock-controller@...30000 {
>> >  			compatible = "starfive,jh7110-stgcrg";
>> >  			reg = <0x0 0x10230000 0x0 0x10000>;
>> > @@ -601,5 +628,12 @@
>> >  			#reset-cells = <1>;
>> >  			power-domains = <&pwrc JH7110_PD_VOUT>;
>> >  		};
>> > +
>> > +		sound0: snd-card0 {
>> 
>> 1. Why card0?
>> 2. Where is this node located? In MMIO bus? Run some basic checks on
>> your DTS before submitting upstream.
>> dtbs_check
>> dtbs W=1
>> 
>> 3. Why this is even in the DTSI? This really looks wrong.
> 
> Excuse me for not following here, but Walker, could you point me at
> where in the schematic for the VisionFive 2 that this wm8960 actually
> is?
> I know ~nothing about audio, but good old Google tells me that this is a
> dedicated codec chip and I was looking at [1] and could not easily find
> it on the schematic.
> 
> Thanks,
> Conor.
> 
> 1 https://doc-en.rvspace.org/VisionFive2/PDF/SCH_RV002_V1.2A_20221216.pdf

Hi Conor,

The TDM need work together with external codec WM8960 by plugging the raspberry pie
 audio board into the 40-pin, which is found in sheet 21 of the schematic. Because the
 40-pin of VisionFive2 is fully compatible with the pins of Raspberry pie audio board. 

For more information of the audio board, you can take a look at the following webpage:
https://wiki.seeedstudio.com/ReSpeaker_2_Mics_Pi_HAT/

The schematic of audio board:
https://files.seeedstudio.com/wiki/MIC_HATv1.0_for_raspberrypi/src/ReSpeaker%202-Mics%20Pi%20HAT_SCH.pdf

Best regards,
Walker