linux-kernel - Re: [PATCH v4 11/23] ASoC: simple-card: Loop over all children for 'mclk-fs'

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Date:   30 Jun 2020 11:08:33 +0900
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     <broonie@...nel.org>, <perex@...ex.cz>, <tiwai@...e.com>,
        <robh+dt@...nel.org>, <lgirdwood@...il.com>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <digetx@...il.com>, <alsa-devel@...a-project.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <sharadg@...dia.com>, <mkumard@...dia.com>,
        <viswanathl@...dia.com>, <rlokhande@...dia.com>,
        <dramesh@...dia.com>, <atalambedu@...dia.com>,
        <nwartikar@...dia.com>, <swarren@...dia.com>,
        <nicoleotsuka@...il.com>
Subject: Re: [PATCH v4 11/23] ASoC: simple-card: Loop over all children for 'mclk-fs'


Hi Sameer

> >>        snprintf(prop, sizeof(prop), "%smclk-fs", prefix);
> >>        of_property_read_u32(node,      prop, &props->mclk_fs);
> >>        of_property_read_u32(cpu,       prop, &props->mclk_fs);
> >> -     of_property_read_u32(codec,     prop, &props->mclk_fs);
> >> +
> >> +     if (cpu != codec)
> >> +             of_property_read_u32(codec, prop, &props->mclk_fs);
> > Maybe we want to have "cpu" in simple_dai_link_of_dpcm() side
> > without using magical code in simple_parse_mclk_fs() side ?
> 
> Are you suggesting if we should simplify simple_parse_mclk_fs() by
> either passing 'cpu' or 'codec'?

Oops, sorry I was misunderstand.

But I still not 100% understand what do you want to do here.
Maybe 50% is my English skill, but in your code
 
(C)	 	of_property_read_u32(cpu,	prop, &props->mclk_fs);
	-	of_property_read_u32(codec,	prop, &props->mclk_fs);
	+
	+	if (cpu != codec)
(B)	+		of_property_read_u32(codec, prop, &props->mclk_fs);

and

	-	simple_parse_mclk_fs(top, np, codec, dai_props, prefix);
(A)	+	simple_parse_mclk_fs(top, np, np, dai_props, prefix);

Because of (A), cpu = codec = np in simple_parse_mclk_fs().
Do we have chance to call (B) ?
And it still have read_u32(cpu, ...) at (C),
this means all np will read mclk_fs anyway ?
For me, if you don't want/need mclk_fs, don't set it on DT
is the best answer, but am I misunderstanding ?

Thank you for your help !!

Best regards
---
Kuninori Morimoto