linux-kernel - [PATCH v3 2/5] ARM: dts: add reference voltage property for MXS LRADC

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 22 Jul 2013 16:04:00 +0200
From:	Hector Palacios <hector.palacios@...i.com>
To:	<linux-iio@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	<alexandre.belloni@...e-electrons.com>, <jic23@...nel.org>,
	<lars@...afoo.de>, <fabio.estevam@...escale.com>, <marex@...x.de>,
	<hector.palacios@...i.com>
Subject: [PATCH v3 2/5] ARM: dts: add reference voltage property for MXS LRADC

Some LRADC channels have fixed pre-dividers so they can measure
different voltages at full scale. The reference voltage allows to
expose a scaling attribute through the IIO sysfs so that a user can
compute the real voltage out of a measured sample value.

Signed-off-by: Hector Palacios <hector.palacios@...i.com>
Acked-by: Marek Vasut <marex@...x.de>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt | 9 ++++++++-
 arch/arm/boot/dts/imx23.dtsi                                    | 4 ++++
 arch/arm/boot/dts/imx28.dtsi                                    | 4 ++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
index 4688205..6ec485c 100644
--- a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
+++ b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
@@ -1,9 +1,12 @@
 * Freescale i.MX28 LRADC device driver
 
 Required properties:
-- compatible: Should be "fsl,imx28-lradc"
+- compatible: "fsl,imx28-lradc", "fsl,imx23-lradc"
 - reg: Address and length of the register set for the device
 - interrupts: Should contain the LRADC interrupts
+- fsl,vref: Reference voltage (in mV) for each LRADC channel. This is the
+	    maximum voltage that can be measured at full scale in each channel
+	    considering fixed pre-dividers.
 
 Optional properties:
 - fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
@@ -18,4 +21,8 @@ Examples:
 		reg = <0x80050000 0x2000>;
 		interrupts = <10 14 15 16 17 18 19
 				20 21 22 23 24 25>;
+		fsl,vref = <1850 1850 1850 1850
+			    1850 1850 1850 7400
+			    1850 1850 3700 1850
+			    3700 1850 1850 7400>
 	};
diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi
index 587ceef..e212902 100644
--- a/arch/arm/boot/dts/imx23.dtsi
+++ b/arch/arm/boot/dts/imx23.dtsi
@@ -430,6 +430,10 @@
 				compatible = "fsl,imx23-lradc";
 				reg = <0x80050000 0x2000>;
 				interrupts = <36 37 38 39 40 41 42 43 44>;
+				fsl,vref = <1850 1850 1850 1850
+					    1850 1850 3700 7400
+					    1850 1850 1850 1850
+					    1850 1850 1850 7400>;
 				status = "disabled";
 			};
 
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 6a8acb0..c1b3724 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -865,6 +865,10 @@
 				reg = <0x80050000 0x2000>;
 				interrupts = <10 14 15 16 17 18 19
 						20 21 22 23 24 25>;
+				fsl,vref = <1850 1850 1850 1850
+					    1850 1850 1850 7400
+					    1850 1850 3700 1850
+					    3700 1850 1850 7400>;
 				status = "disabled";
 			};
 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/