linux-kernel - Re: [PATCH] ASoC: sgtl5000: add support for a fixed sysclk frequency

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Message-Id: <28F29E6E-B067-4C06-8D35-3786D4B43AAE@theobroma-systems.com>
Date:   Tue, 17 Oct 2017 11:01:57 +0200
From:   Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Fabio Estevam <fabio.estevam@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Klaus Goger <klaus.goger@...obroma-systems.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Richard Leitner <richard.leitner@...data.com>,
        Bhumika Goyal <bhumirks@...il.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] ASoC: sgtl5000: add support for a fixed sysclk frequency


> On 16. Oct 2017, at 13:19, Fabio Estevam <festevam@...il.com> wrote:
> 
>> I think I see a way to fix this without adding a DTS property, I’ll send out a patch later this afternoon.
> 
> Ok, great.

Hi Fabio, I think I found a way to get our use-case working with just DTS configuration
for simple-audio-card.

When you define the “clocks” property for the "simple-audio-card,cpu” sub-node,
set_sysclk is called only once, on startup - like the IMX driver does.

We should get away without changes to the codec driver.

Thanks & best regards,
Jakob