linux-kernel - Re: [PATCH] ASoC: fsl_spdif: don't change the root clock rate of spdif in driver

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Message-ID: <20140917025014.GA6048@Asurada>
Date:	Tue, 16 Sep 2014 19:50:15 -0700
From:	Nicolin Chen <nicoleotsuka@...il.com>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	Shengjiu Wang <shengjiu.wang@...escale.com>, timur@...i.org,
	Li.Xiubo@...escale.com, lgirdwood@...il.com, broonie@...nel.org,
	perex@...ex.cz, tiwai@...e.de, alsa-devel@...a-project.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: fsl_spdif: don't change the root clock rate of
 spdif in driver

On Wed, Sep 17, 2014 at 10:31:28AM +0800, Shawn Guo wrote:
> On Tue, Sep 16, 2014 at 07:24:40PM -0700, Nicolin Chen wrote:
> > It's not supported in the clock API or just not implemented in our
> > code? Can we just register a clock without CLK_SET_RATE_PARENT to
> > achieve the purpose? (We are just trying to fix those PRED and PODF
> > dividers when the driver calls set_rate to their GATE clock.)
> 
> It seems I misunderstood your question.  Yes, if we drop flag
> CLK_SET_RATE_PARENT for the gate clock in question, the rate change
> request will not be propagated to upstream dividers.

Okay. Since there's a solution that allows us to handle it better,
problem solved then.

@Shengjiu
Would you please take a look at the clock driver to implement a
new clock register function? And make sure to register the GATE
clock only without the flag CLK_SET_RATE_PARENT, as we may still
need to set a reasonable rate for the clock by setting its PODF
clock node instead.

Thank you both
Nicolin
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