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From: Nicolin Chen <Guangyu.Chen@freescale.com>
To: "jonsmirl@gmail.com" <jonsmirl@gmail.com>
Cc: alsa-devel mailing list <alsa-devel@alsa-project.org>,
	Mark Brown <broonie@kernel.org>,
	Lars-Peter Clausen <lars@metafoo.de>,
	zengzm.kernel@gmail.com, Liam Girdwood <lgirdwood@gmail.com>
Subject: Re: SGTL500 and its external MCLK
Date: Fri, 8 Aug 2014 13:29:20 +0800	[thread overview]
Message-ID: <20140808052901.GA6028@MrMyself> (raw)
In-Reply-To: <CAKON4OxRr-igCSZ2HwXcKGFT7O6sQjJUMP_aF19kSRP59ZxFew@mail.gmail.com>

On Thu, Aug 07, 2014 at 03:37:47PM -0400, jonsmirl@gmail.com wrote:
> Since the sgtl5000 driver has the handle to the clock, can't it just
> ask the clock for its rate? If it directly asked the clock for its
> rate it looks like this codec could be bound with simple-audio-card
> and not need a machine driver.

I think Simple Card should already have the capability to support
this without changing sgtl5000's code. It has two properties that
can make it call set_sysclk() for you during the init(). They are
'clocks' and 'system-clock-frequency'. Please refer to its binding
doc for details.

And the topic why not let sgtl5000 fully control the clock has been
discussed in this thread:
http://comments.gmane.org/gmane.linux.alsa.devel/109093

So I think the change can be done as well?

Best regards,
Nicolin

  reply	other threads:[~2014-08-08  5:31 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-07 19:37 SGTL500 and its external MCLK jonsmirl
2014-08-08  5:29 ` Nicolin Chen [this message]
2014-08-08 17:07   ` jonsmirl
2014-08-09 16:42     ` jonsmirl
2014-08-11  5:50       ` Nicolin Chen
2014-08-11 12:29         ` jonsmirl
2014-08-13 20:39           ` Mark Brown

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