From: Stefan Agner <stefan@xxxxxxxx>
This adds the devicetree bindings for the STMPE ADC.
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
Signed-off-by: Max Krummenacher <max.krummenacher@xxxxxxxxxxx>
Signed-off-by: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
---
.../devicetree/bindings/iio/adc/stmpe-adc.txt | 34 +++++++++++++++++++
1 file changed, 34 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
diff --git a/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
new file mode 100644
index 000000000000..752ef35a794d
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/stmpe-adc.txt
@@ -0,0 +1,34 @@
+STMPE ADC driver
+----------------
+
+Required properties:
+ - compatible: "st,stmpe-adc"
+
+Optional properties:
+Note that the ADC is shared with the STMPE touchscreen, so if using both the
+settings should be the same.
+If the settings are not the same, the settings of the driver initialized last
+will be active.
+- st,sample-time: ADC conversion time in number of clock. (0 -> 36 clocks,
+ 1 -> 44 clocks, 2 -> 56 clocks, 3 -> 64 clocks, 4 -> 80 clocks,
+ 5 -> 96 clocks, 6 -> 144 clocks), recommended is 4.
+- st,mod-12b: ADC Bit mode (0 -> 10bit ADC, 1 -> 12bit ADC)
+- st,ref-sel: ADC reference source (0 -> internal reference, 1 -> external
+ reference)
+- st,adc-freq: ADC Clock speed (0 -> 1.625 MHz, 1 -> 3.25 MHz, 2 || 3 -> 6.5 MHz)
+- st,norequest-mask: bitmask specifying which ADC channels should _not_ be
+ requestable due to different usage (e.g. touch)
+
+Node name must be stmpe_adc and should be child node of stmpe node to
+which it belongs.
+
+Example:
+
+ stmpe_adc {
+ compatible = "st,stmpe-adc";
+ st,sample-time = <4>;
+ st,mod-12b = <1>;
+ st,ref-sel = <0>;
+ st,adc-freq = <1>;
+ st,norequest-mask = <0x0F>; /* dont use ADC CH3-0 */
+ };
--
2.19.1
