linux-kernel - Re: [PATCH v2] ASoC: cs42888: Add codec driver support

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Message-ID: <20140311113053.GA1036@e106331-lin.cambridge.arm.com>
Date:	Tue, 11 Mar 2014 11:30:53 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Nicolin Chen <Guangyu.Chen@...escale.com>
Cc:	"broonie@...nel.org" <broonie@...nel.org>,
	"brian.austin@...rus.com" <brian.austin@...rus.com>,
	"Paul.Handrigan@...rus.com" <Paul.Handrigan@...rus.com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"rob@...dley.net" <rob@...dley.net>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"lars@...afoo.de" <lars@...afoo.de>
Subject: Re: [PATCH v2] ASoC: cs42888: Add codec driver support

On Tue, Mar 11, 2014 at 11:19:51AM +0000, Nicolin Chen wrote:
> This patch adds support for the Cirrus Logic CS42888 Audio CODEC that
> has four 24-bit A/D and eight 24-bit D/A converters.
> 
> [ CS42888 supports both I2C and SPI control ports. As initial patch,
>   this patch only adds the support for I2C. ]
> 
> Signed-off-by: Nicolin Chen <Guangyu.Chen@...escale.com>
> ---
> 
> Changelog
> v2:
>  * Separated driver into I2C and main part drivers.
>  * Added error out if failed to get clock.
>  * Enabled Auto-mute function as default.
>  * Disabled runtime-pm in remove().
>  * Added return value checking for regcache_sync().
>  * Fixed some trival parts like 'const' as Lars mentioned.
> 
>  .../devicetree/bindings/sound/cs42888.txt          |  27 ++
>  sound/soc/codecs/Kconfig                           |  10 +
>  sound/soc/codecs/Makefile                          |   4 +
>  sound/soc/codecs/cs42888-i2c.c                     |  68 +++
>  sound/soc/codecs/cs42888.c                         | 536 +++++++++++++++++++++
>  sound/soc/codecs/cs42888.h                         | 213 ++++++++
>  6 files changed, 858 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/cs42888.txt
>  create mode 100644 sound/soc/codecs/cs42888-i2c.c
>  create mode 100644 sound/soc/codecs/cs42888.c
>  create mode 100644 sound/soc/codecs/cs42888.h
> 
> diff --git a/Documentation/devicetree/bindings/sound/cs42888.txt b/Documentation/devicetree/bindings/sound/cs42888.txt
> new file mode 100644
> index 0000000..7736527
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/cs42888.txt
> @@ -0,0 +1,27 @@
> +CS42888 audio CODEC
> +
> +Required properties:
> +
> +  - compatible : "cirrus,cs42888"
> +
> +  - reg : the I2C address of the device for I2C
> +
> +  - clocks : phandle to the clock source for MCLK
> +
> +  - clock-names : must contain "mclk".

If you use clock-names, please define the clocks property in terms of
clock-names to avoid redundancy. e.g.

- clocks: a list of phandles + clock-specifiers, one for each entry in
  clock-names.

It makes the relationship between the two clearer, and makes it far
easier to alter the binding in future if required.

Cheers,
Mark.
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