Documentation: DT: Document twl4030-madc binding

Add devicetree binding documentation for twl4030-madc
analog digital converter.

Signed-off-by: Sebastian Reichel <sre@debian.org>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/iio/adc/twl4030-madc.txt b/Documentation/devicetree/bindings/iio/adc/twl4030-madc.txt
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index 000000000000..6bdd21404b57
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+++ b/Documentation/devicetree/bindings/iio/adc/twl4030-madc.txt
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+* TWL4030 Monitoring Analog to Digital Converter (MADC)
+
+The MADC subsystem in the TWL4030 consists of a 10-bit ADC
+combined with a 16-input analog multiplexer.
+
+Required properties:
+  - compatible: Should contain "ti,twl4030-madc".
+  - interrupts: IRQ line for the MADC submodule.
+  - #io-channel-cells: Should be set to <1>.
+
+Optional properties:
+  - ti,system-uses-second-madc-irq: boolean, set if the second madc irq register
+                                    should be used, which is intended to be used
+                                    by Co-Processors (e.g. a modem).
+
+Example:
+
+&twl {
+        madc {
+                compatible = "ti,twl4030-madc";
+                interrupts = <3>;
+                #io-channel-cells = <1>;
+        };
+};