linux-kernel - Re: [PATCH 0/2] Cygnus Audio Driver

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Date:	Mon, 6 Apr 2015 10:58:03 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Scott Branden <sbranden@...adcom.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	bcm-kernel-feedback-list@...adcom.com,
	Lori Hikichi <lhikichi@...adcom.com>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazao <anatol@...gle.com>, abrestic@...gle.com,
	bryeung@...gle.com, olofj@...gle.com, pwestin@...gle.com
Subject: Re: [PATCH 0/2] Cygnus Audio Driver

On Fri, Apr 03, 2015 at 12:33:12PM -0700, Scott Branden wrote:
> On 15-03-30 11:43 PM, Mark Brown wrote:
> >On Mon, Mar 30, 2015 at 08:16:22PM -0700, Scott Branden wrote:

> >>The audio PLL is embedded in the audio block and only used
> >>by the audio block. The audio PLL registers are also in the middle of
> >>the audio register map.

> >When you say it's only used by the audio block do you mean to say that
> >the audio block exposes no clock signals other than the bit and frame
> >clocks?

> The audio block exposes the MCLK in addition to the bit and frame clock.

OK, then it's going to need to be a clock provider at some point - the
clock will be going into external devices which are going to need to be
able to interact with the clock (for example, to get the rate).

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