linux-kernel - Re: [PATCH v2 3/3] ARM: dts: add property for maximum ADC clock frequencies

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Date:	Mon, 16 Mar 2015 16:17:55 +0100
From:	Stefan Agner <stefan@...er.ch>
To:	shawn.guo@...aro.org, kernel@...gutronix.de
Cc:	jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
	pmeerw@...erw.net, robh+dt@...nel.org, pawel.moll@....com,
	mark.rutland@....com, ijc+devicetree@...lion.org.uk,
	galak@...eaurora.org, B38611@...escale.com,
	maitysanchayan@...il.com, devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] ARM: dts: add property for maximum ADC clock
 frequencies

Forgot to add i.MX/Vybrid maintainers Shawn and Sascha.

On 2015-03-16 16:10, Stefan Agner wrote:
> The ADC clock frequency is limited depending on modes used. Add
> device tree property which allow to set the mode used and the
> maximum frequency ratings for the instance. These allows to
> set the ADC clock to a frequency which is within specification
> according to the actual mode used.
> 
> Acked-by: Fugang Duan <B38611@...escale.com>
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>  Documentation/devicetree/bindings/iio/adc/vf610-adc.txt | 9 +++++++++
>  arch/arm/boot/dts/vfxxx.dtsi                            | 4 ++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt
> b/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt
> index 1a4a43d..3eb40e2 100644
> --- a/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt
> +++ b/Documentation/devicetree/bindings/iio/adc/vf610-adc.txt
> @@ -11,6 +11,13 @@ Required properties:
>  - clock-names: Must contain "adc", matching entry in the clocks property.
>  - vref-supply: The regulator supply ADC reference voltage.
>  
> +Recommended properties:
> +- fsl,adck-max-frequency: Maximum frequencies according to datasheets operating
> +  requirements. Three values are required, depending on conversion mode:
> +  - Frequency in normal mode (ADLPC=0, ADHSC=0)
> +  - Frequency in high-speed mode (ADLPC=0, ADHSC=1)
> +  - Frequency in low-power mode (ADLPC=1, ADHSC=0)
> +
>  Example:
>  adc0: adc@...3b000 {
>  	compatible = "fsl,vf610-adc";
> @@ -18,5 +25,7 @@ adc0: adc@...3b000 {
>  	interrupts = <0 53 0x04>;
>  	clocks = <&clks VF610_CLK_ADC0>;
>  	clock-names = "adc";
> +	fsl,adck-max-frequency = <30000000>, <40000000>,
> +				<20000000>;
>  	vref-supply = <&reg_vcc_3v3_mcu>;
>  };
> diff --git a/arch/arm/boot/dts/vfxxx.dtsi b/arch/arm/boot/dts/vfxxx.dtsi
> index a29c7ce..c6609bd 100644
> --- a/arch/arm/boot/dts/vfxxx.dtsi
> +++ b/arch/arm/boot/dts/vfxxx.dtsi
> @@ -189,6 +189,8 @@
>  				clocks = <&clks VF610_CLK_ADC0>;
>  				clock-names = "adc";
>  				status = "disabled";
> +				fsl,adck-max-frequency = <30000000>, <40000000>,
> +							<20000000>;
>  			};
>  
>  			wdoga5: wdog@...3e000 {
> @@ -387,6 +389,8 @@
>  				clocks = <&clks VF610_CLK_ADC1>;
>  				clock-names = "adc";
>  				status = "disabled";
> +				fsl,adck-max-frequency = <30000000>, <40000000>,
> +							<20000000>;
>  			};
>  
>  			esdhc1: esdhc@...b2000 {

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