IIO: AT91: Add DT support to at91_adc driver

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/arm/atmel-adc.txt b/Documentation/devicetree/bindings/arm/atmel-adc.txt
new file mode 100644
index 000000000000..c63097d6afeb
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/atmel-adc.txt
@@ -0,0 +1,65 @@
+* AT91's Analog to Digital Converter (ADC)
+
+Required properties:
+  - compatible: Should be "atmel,at91sam9260-adc"
+  - reg: Should contain ADC registers location and length
+  - interrupts: Should contain the IRQ line for the ADC
+  - atmel,adc-channel-base: Offset of the first channel data register
+  - atmel,adc-channels-used: Bitmask of the channels muxed and enable for this
+    device
+  - atmel,adc-drdy-mask: Mask of the DRDY interruption in the ADC
+  - atmel,adc-num-channels: Number of channels available in the ADC
+  - atmel,adc-startup-time: Startup Time of the ADC in microseconds as
+    defined in the datasheet
+  - atmel,adc-status-register: Offset of the Interrupt Status Register
+  - atmel,adc-trigger-register: Offset of the Trigger Register
+  - atmel,adc-vref: Reference voltage in millivolts for the conversions
+
+Optional properties:
+  - atmel,adc-use-external: Boolean to enable of external triggers
+ 
+Optional trigger Nodes:
+  - Required properties:
+    * trigger-name: Name of the trigger exposed to the user
+    * trigger-value: Value to put in the Trigger register
+      to activate this trigger
+  - Optional properties:
+    * trigger-external: Is the trigger an external trigger?
+
+Examples:
+adc0: adc@fffb0000 {
+        compatible = "atmel,at91sam9260-adc";
+        reg = <0xfffb0000 0x100>;
+        interrupts = <20 4>;
+        atmel,adc-channel-base = <0x30>;
+        atmel,adc-channels-used = <0xff>;
+        atmel,adc-drdy-mask = <0x10000>;
+        atmel,adc-num-channels = <8>;
+        atmel,adc-startup-time = <40>;
+        atmel,adc-status-register = <0x1c>;
+        atmel,adc-trigger-register = <0x08>;
+        atmel,adc-use-external;
+        atmel,adc-vref = <3300>;
+
+        trigger@0 {
+                trigger-name = "external-rising";
+                trigger-value = <0x1>;
+                trigger-external;
+        };
+        trigger@1 {
+                trigger-name = "external-falling";
+                trigger-value = <0x2>;
+                trigger-external;
+        };
+
+        trigger@2 {
+                trigger-name = "external-any";
+                trigger-value = <0x3>;
+                trigger-external;
+        };
+
+        trigger@3 {
+                trigger-name = "continuous";
+                trigger-value = <0x6>;
+        };
+};