From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Agner Subject: Re: [PATCH v2 3/3] ARM: dts: add property for maximum ADC clock frequencies Date: Mon, 16 Mar 2015 16:17:55 +0100 Message-ID: <80ba0aa345e8bb04e23e2988f51a851d@agner.ch> References: <1426518614-20201-1-git-send-email-stefan@agner.ch> <1426518614-20201-4-git-send-email-stefan@agner.ch> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1426518614-20201-4-git-send-email-stefan@agner.ch> Sender: linux-kernel-owner@vger.kernel.org To: shawn.guo@linaro.org, kernel@pengutronix.de Cc: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, B38611@freescale.com, maitysanchayan@gmail.com, devicetree@vger.kernel.org, linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org 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 > Signed-off-by: Stefan Agner > --- > 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@4003b000 { > compatible = "fsl,vf610-adc"; > @@ -18,5 +25,7 @@ adc0: adc@4003b000 { > interrupts = <0 53 0x04>; > clocks = <&clks VF610_CLK_ADC0>; > clock-names = "adc"; > + fsl,adck-max-frequency = <30000000>, <40000000>, > + <20000000>; > vref-supply = <®_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@4003e000 { > @@ -387,6 +389,8 @@ > clocks = <&clks VF610_CLK_ADC1>; > clock-names = "adc"; > status = "disabled"; > + fsl,adck-max-frequency = <30000000>, <40000000>, > + <20000000>; > }; > > esdhc1: esdhc@400b2000 {