linux-kernel - Re: [PATCH 8/8] arm64: dts: renesas: salvator: add a connection from adv748x codec (HDMI input) to the R-Car SoC

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Date:   09 Mar 2020 10:31:01 +0900
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Alex Riesen <alexander.riesen@...itec.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Driver Development <devel@...verdev.osuosl.org>,
        Linux Media <linux-media@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Device Tree <devicetree@...r.kernel.org>,
        Renesas SoC <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH 8/8] arm64: dts: renesas: salvator: add a connection from adv748x codec (HDMI input) to the R-Car SoC


Hi

> > > Those clocks are part of the CSI-2 protocol and also don't need to be
> > > explicitly controlled. As far as I can tell from a quick check of the
> > > ADV7482 documentation, only the I2S MCLK is a general-purpose clock that
> > > needs to be exposed.
(snip)
> > Do you know, by chance, which of the snd_soc* callbacks should be used to
> > implement setting of the MCLK? The one in snd_soc_component_driver or
> > snd_soc_dai_driver->ops (snd_soc_dai_ops)?
> > 
> > Or how the userspace interface looks like? Or, if there is no userspace
> > interface for this, how the MCLK is supposed to be set? Through mclk-fs?
> 
> I'm afraid my knowledge of the sound subsystem is limited. Morimoto-san
> is the main developer and maintainer of Renesas sound drivers.
> Morimoto-sensei, would you have an answer to that question ? :-)

In my quick check, it goes to AUDIO_CLKC.
If so, you can update rcar_sound::clocks.

	&rcar_sound {
		...
-		/* update <audio_clk_b> to <cs2000> */
+		/* update <audio_clk_b> to <cs2000>,
+		 *        <audio_clk_c> to <adv748x> */
		clocks = <&cpg CPG_MOD 1005>,
			...
			 <&audio_clk_a>, <&cs2000>,
-			 <&audio_clk_c>,
+			 <&adv748x>,
			 <&cpg CPG_CORE CPG_AUDIO_CLK_I>;

Thank you for your help !!

Best regards
---
Kuninori Morimoto