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authorJuergen Beisert <jbe@pengutronix.de>2013-09-23 15:36:00 +0100
committerJonathan Cameron <jic23@kernel.org>2013-10-01 16:19:17 +0100
commite9c88fb5cf05ae198323a3c992b41885397a0b48 (patch)
tree80d195255b56b03f785fa0a3e61770028a617194 /Documentation
parentcd6c5586524e10512b910b3ff44465f0aaf5cd1b (diff)
Staging/iio/adc/touchscreen/MXS: provide devicetree adaption
This is an RFC for the new touchscreen properties. Signed-off-by: Juergen Beisert <jbe@pengutronix.de> Tested-by: Marek Vasut <marex@denx.de> Acked-by: Marek Vasut <marex@denx.de> Tested-by: Lothar Waßmann <LW@KARO-electronics.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org> CC: linux-arm-kernel@lists.infradead.org CC: linux-input@vger.kernel.org CC: devel@driverdev.osuosl.org CC: Marek Vasut <marex@denx.de> CC: Fabio Estevam <fabio.estevam@freescale.com> CC: devicetree@vger.kernel.org
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt36
1 files changed, 31 insertions, 5 deletions
diff --git a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
index 46882058b59b..ee05dc390694 100644
--- a/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
+++ b/Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
@@ -1,7 +1,8 @@
* Freescale i.MX28 LRADC device driver
Required properties:
-- compatible: Should be "fsl,imx28-lradc"
+- compatible: Should be "fsl,imx23-lradc" for i.MX23 SoC and "fsl,imx28-lradc"
+ for i.MX28 SoC
- reg: Address and length of the register set for the device
- interrupts: Should contain the LRADC interrupts
@@ -9,13 +10,38 @@ Optional properties:
- fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
to LRADC. Valid value is either 4 or 5. If this
property is not present, then the touchscreen is
- disabled.
+ disabled. 5 wires is valid for i.MX28 SoC only.
+- fsl,ave-ctrl: number of samples per direction to calculate an average value.
+ Allowed value is 1 ... 31, default is 4
+- fsl,ave-delay: delay between consecutive samples. Allowed value is
+ 1 ... 2047. It is used if 'fsl,ave-ctrl' > 1, counts at
+ 2 kHz and its default is 2 (= 1 ms)
+- fsl,settling: delay between plate switch to next sample. Allowed value is
+ 1 ... 2047. It counts at 2 kHz and its default is
+ 10 (= 5 ms)
-Examples:
+Example for i.MX23 SoC:
+
+ lradc@80050000 {
+ compatible = "fsl,imx23-lradc";
+ reg = <0x80050000 0x2000>;
+ interrupts = <36 37 38 39 40 41 42 43 44>;
+ status = "okay";
+ fsl,lradc-touchscreen-wires = <4>;
+ fsl,ave-ctrl = <4>;
+ fsl,ave-delay = <2>;
+ fsl,settling = <10>;
+ };
+
+Example for i.MX28 SoC:
lradc@80050000 {
compatible = "fsl,imx28-lradc";
reg = <0x80050000 0x2000>;
- interrupts = <10 14 15 16 17 18 19
- 20 21 22 23 24 25>;
+ interrupts = <10 14 15 16 17 18 19 20 21 22 23 24 25>;
+ status = "okay";
+ fsl,lradc-touchscreen-wires = <5>;
+ fsl,ave-ctrl = <4>;
+ fsl,ave-delay = <2>;
+ fsl,settling = <10>;
};