linux-kernel - Re: [RESEND PATCH v2 2/2] ASoC: atmel-classd: DT binding for PDMIC driver

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Message-ID: <20151219041755.GG14936@rob-hp-laptop>
Date:	Fri, 18 Dec 2015 22:17:55 -0600
From:	Rob Herring <robh@...nel.org>
To:	Songjun Wu <songjun.wu@...el.com>
Cc:	broonie@...nel.org, nicolas.ferre@...el.com,
	linux-arm-kernel@...ts.infradead.org,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v2 2/2] ASoC: atmel-classd: DT binding for PDMIC
 driver

On Thu, Dec 17, 2015 at 05:50:00PM +0800, Songjun Wu wrote:
> DT binding documentation for this new ASoC driver.
> 
> Signed-off-by: Songjun Wu <songjun.wu@...el.com>
> ---
> 
> Changes in v2: None
> 
>  .../devicetree/bindings/sound/atmel-pdmic.txt      |   55 ++++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/atmel-pdmic.txt
> 
> diff --git a/Documentation/devicetree/bindings/sound/atmel-pdmic.txt b/Documentation/devicetree/bindings/sound/atmel-pdmic.txt
> new file mode 100644
> index 0000000..e0875f1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/atmel-pdmic.txt
> @@ -0,0 +1,55 @@
> +* Atmel PDMIC driver under ALSA SoC architecture
> +
> +Required properties:
> +- compatible
> +	Should be "atmel,sama5d2-pdmic".
> +- reg
> +	Should contain PDMIC registers location and length.
> +- interrupts
> +	Should contain the IRQ line for the PDMIC.
> +- dmas
> +	One DMA specifiers as described in atmel-dma.txt and dma.txt files.
> +- dma-names
> +	Must be "rx".
> +- clock-names
> +	Required elements:
> +	- "pclk"	peripheral clock
> +	- "gclk"	generated clock
> +- clocks
> +	Must contain an entry for each required entry in clock-names.
> +	Please refer to clock-bindings.txt.
> +- atmel,mic-min-freq
> +	The minimal frequency that the micphone supports.
> +- atmel,mic-max-freq
> +	The maximal frequency that the micphone supports.

Please append units to these 2 (-hz).

 
> +Optional properties:
> +- pinctrl-names, pinctrl-0
> +	Please refer to pinctrl-bindings.txt.
> +- atmel,model
> +	The user-visible name of this sound card.
> +	The default value is "PDMIC".

When and why would this be different than the default?

"label" can be used here if this is really needed.

> +- atmel,mic-offset
> +	The offset that should be added.
> +	The range is from -32768 to 32767.
> +	The default value is 0.
> +
> +Example:
> +	pdmic@...18000 {
> +				compatible = "atmel,sama5d2-pdmic";
> +				reg = <0xf8018000 0x124>;
> +				interrupts = <48 IRQ_TYPE_LEVEL_HIGH 7>;
> +				dmas = <&dma0
> +					(AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1)
> +					| AT91_XDMAC_DT_PERID(50))>;
> +				dma-names = "rx";
> +				clocks = <&pdmic_clk>, <&pdmic_gclk>;
> +				clock-names = "pclk", "gclk";
> +
> +				pinctrl-names = "default";
> +				pinctrl-0 = <&pinctrl_pdmic_default>;
> +				atmel,model = "PDMIC @ sama5d2_xplained";
> +				atmel,mic-min-freq = <1000000>;
> +				atmel,mic-max-freq = <3246000>;
> +				atmel,mic-offset = <0x0>;
> +	};
> -- 
> 1.7.9.5
> 
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