linux-kernel - Re: [PATCH V2] ASoC: fsl_ssi: refine ipg clock usage in this module

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Date:	Fri, 12 Sep 2014 08:17:06 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Shengjiu Wang <shengjiu.wang@...escale.com>
Cc:	Nicolin Chen <nicoleotsuka@...il.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 V2] ASoC: fsl_ssi: refine ipg clock usage in this module

Hi,

On Fri, Sep 12, 2014 at 10:01:12AM +0800, Shengjiu Wang wrote:
> On Thu, Sep 11, 2014 at 03:57:37PM -0700, Nicolin Chen wrote:
> > On Thu, Sep 11, 2014 at 01:38:29PM +0800, Shengjiu Wang wrote:
> > > Move the ipg clock enable and disable operation to startup and shutdown,
> > > that is only enable ipg clock when ssi is working. Keep clock is disabled
> > > when ssi is in idle.
> > > otherwise, _fsl_ssi_set_dai_fmt function need to be called in probe,
> > > so add ipg clock control for it.
> > 
> > It seems to be no objection so far against my last suggestion to
> > use regmap's mmio_clk() for named ipg clk only. So you may still
> > consider about that.
> >
> I think mmio_clk() can be put to another patch. and this patch only for clk_enable()
> and clk_disable() operation.

I would also prefer Nicolin's suggestion using regmap's mmio clk. I
think it may be better to not add this particular patch at all and just
go with the mmio_clk patch. It should be easy enough to just add the
clock names to the devicetrees. That way we can avoid all those clock
enable/disable function calls.

>  
> > Anyway, I'd like to do thing in parallel. So I just simply tested
> > it on my side and its works fine, it may still need to be tested
> > by others though.
> > 
> > Nicolina
> 
> Hi Markus
> 
> could you please review it, and share your comments?

I think the clock enabling for AC97 is missing in your patch.

Best regards,

Markus

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