linux-kernel - Re: [PATCH] ASoC: Atmel: ClassD: Set GCK's parent clock

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Message-ID: <20151120180854.GD1929@sirena.org.uk>
Date:	Fri, 20 Nov 2015 18:08:54 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Songjun Wu <songjun.wu@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: Atmel: ClassD: Set GCK's parent clock

On Thu, Nov 19, 2015 at 11:26:30AM +0800, Songjun Wu wrote:
> Set GCK's parent clock as audio clock, make
> sure the GCK's parent clock is audio clock.

> +	ret = clk_set_parent(dd->gclk, dd->aclk);
> +	if (ret) {
> +		dev_err(dev, "failed to set GCK parent clock: %d\n", ret);
> +		return ret;
> +	}

Why are we doing this in the driver?  This should be done by whatever
creates the clock tree, not by the driver that uses the clocks - that
way if some future SoC has a different clock tree the driver will
continue to work.

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