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SubjectRe: [PATCH v4 11/23] ASoC: simple-card: Loop over all children for 'mclk-fs'
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On 6/30/2020 7:38 AM, Kuninori Morimoto wrote:
> External email: Use caution opening links or attachments
>
>
> 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 ?
Sorry if I was not clear before.

My goal was to get rid of 'codec' argument from DPCM function
simple_dai_link_of_dpcm(). Patches 10/23, 11/23 are preparations for
12/23 to have multiple Codec support.

simple_parse_mclk_fs() is used by both simple_dai_link_of_dpcm() and
simple_dai_link_of(). To make the same API work for both the cases, I
had to use (A) in DPCM function. Now (B) does not get used for
simple_dai_link_of_dpcm(), but will get used by simple_dai_link_of().

If it is simpler I will just avoid 'cpu != codec' check and keep the
function simple_parse_mclk_fs() as it is.

>
> Thank you for your help !!
>
> Best regards
> ---
> Kuninori Morimoto

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