linux-kernel - [PATCH 1/2] dt-bindings: iio: stm32-adc: add option to set resolution

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Date:   Wed, 15 Feb 2017 17:55:56 +0100
From:   Fabrice Gasnier <fabrice.gasnier@...com>
To:     <jic23@...nel.org>, <linux@...linux.org.uk>, <robh+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <linux-iio@...r.kernel.org>, <mark.rutland@....com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
        <lars@...afoo.de>, <knaack.h@....de>, <pmeerw@...erw.net>,
        <fabrice.gasnier@...com>
Subject: [PATCH 1/2] dt-bindings: iio: stm32-adc: add option to set resolution

Add documentation for 'st,adc-res' dt optional property.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
---
 Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
index 5dfc88e..45f7ff2 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
@@ -57,6 +57,9 @@ Optional properties:
 - dmas: Phandle to dma channel for this ADC instance.
   See ../../dma/dma.txt for details.
 - dma-names: Must be "rx" when dmas property is being used.
+- st,adc-res: Resolution (bits) to use for conversions. Must match device
+  available resolutions (e.g. can be 6, 8, 10 or 12 on stm32f4). Default
+  is maximum resolution if unset.
 
 Example:
 	adc: adc@...12000 {
@@ -84,6 +87,7 @@ Example:
 			st,adc-channels = <8>;
 			dmas = <&dma2 0 0 0x400 0x0>;
 			dma-names = "rx";
+			st,adc-res = <8>;
 		};
 		...
 		other adc child nodes follow...
-- 
1.9.1