[PATCH 02/10] dt-bindings: iio: adc: at91-sama5d2: add rtc-trigger optional property

[<Eugen.Hristev@microchip.com>]

From: Eugen Hristev <eugen.hristev@microchip.com>

Add property to connect RTC-type trigger to the ADC block.
The ADC is connected internally with a line to the RTC block.
The RTC can provide a trigger signal to the ADC to start conversions.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
 Documentation/devicetree/bindings/iio/adc/at91-sama5d2_adc.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/at91-sama5d2_adc.txt b/Documentation/devicetree/bindings/iio/adc/at91-sama5d2_adc.txt
index 4a3c1d4..1980f0e 100644
--- a/Documentation/devicetree/bindings/iio/adc/at91-sama5d2_adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/at91-sama5d2_adc.txt
@@ -23,6 +23,9 @@ Optional properties:
   See ../../dma/dma.txt for details.
   - #io-channel-cells: in case consumer drivers are attached, this must be 1.
   See <Documentation/devicetree/bindings/iio/iio-bindings.txt> for details.
+  - atmel,rtc-trigger: The ADC IP block can be triggered by the RTC block
+inside the SoC. This property is a phandle to a node that provides a
+trigger device, if the ADC block supports it.
 
 Properties for consumer drivers:
   - Consumer drivers can be connected to this producer device, as specified
@@ -44,6 +47,7 @@ adc: adc@fc030000 {
 	vddana-supply = <&vdd_3v3_lp_reg>;
 	vref-supply = <&vdd_3v3_lp_reg>;
 	atmel,trigger-edge-type = <IRQ_TYPE_EDGE_BOTH>;
+	atmel,rtc-trigger = <&rtc_adc_trigger>;
 	dmas = <&dma0 (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) | AT91_XDMAC_DT_PERID(25))>;
 	dma-names = "rx";
 	#io-channel-cells = <1>;
-- 
2.7.4