This patch adds documentation for the A33 GPADC binding.
Signed-off-by: Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxx>
---
added in v2
.../devicetree/bindings/mfd/sun4i-gpadc.txt | 59 ++++++++++++++++++++++
1 file changed, 59 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
diff --git a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
new file mode 100644
index 0000000..17242c8
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
@@ -0,0 +1,59 @@
+Allwinner SoCs' GPADC Device Tree bindings
+------------------------------------------
+The Allwinner SoCs all have an ADC that can also act as a thermal sensor
+and sometimes as a touchscreen controller.
+
+Required properties:
+ - compatible: "sun8i-a33-gpadc-iio",
+ - reg: mmio address range of the chip,
+ - #thermal-sensor-cells: shall be 0,
+ - #io-channel-cells: shall be 0,
+
+Example:
+ rtp: rtp@01c25000 {
+ compatible = "allwinner,sun8i-a33-gpadc-iio";
+ reg = <0x01c25000 0x100>;
+ #thermal-sensor-cells = <0>;
+ #io-channel-cells = <0>;
+ };
+
+sun4i, sun5i and sun6i SoCs are also supported via the older binding:
+
+sun4i resistive touchscreen controller
+--------------------------------------
+
+Required properties:
+ - compatible: "allwinner,sun4i-a10-ts", "allwinner,sun5i-a13-ts" or
+ "allwinner,sun6i-a31-ts"
+ - reg: mmio address range of the chip
+ - interrupts: interrupt to which the chip is connected
+ - #thermal-sensor-cells: shall be 0
+
+Optional properties:
+ - allwinner,ts-attached : boolean indicating that an actual touchscreen
+ is attached to the controller
+ - allwinner,tp-sensitive-adjust : integer (4 bits)
+ adjust sensitivity of pen down detection
+ between 0 (least sensitive) and 15
+ (defaults to 15)
+ - allwinner,filter-type : integer (2 bits)
+ select median and averaging filter
+ samples used for median / averaging filter
+ 0: 4/2
+ 1: 5/3
+ 2: 8/4
+ 3: 16/8
+ (defaults to 1)
+
+Example:
+
+ rtp: rtp@01c25000 {
+ compatible = "allwinner,sun4i-a10-ts";
+ reg = <0x01c25000 0x100>;
+ interrupts = <29>;
+ allwinner,ts-attached;
+ #thermal-sensor-cells = <0>;
+ /* sensitive/noisy touch panel */
+ allwinner,tp-sensitive-adjust = <0>;
+ allwinner,filter-type = <3>;
+ };
--
2.9.3
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