linux-kernel - [PATCH v3 4/5] ARM: at91/dt: sama5d2 Xplained: enable the adc device

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Date:	Thu, 14 Jan 2016 16:38:16 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	<jic23@...nel.org>, <nicolas.ferre@...el.com>,
	<alexandre.belloni@...e-electrons.com>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-iio@...r.kernel.org>, <plagnioj@...osoft.com>,
	<linux-arm-kernel@...ts.infradead.org>, <pmeerw@...erw.net>,
	<robh@...nel.org>, Ludovic Desroches <ludovic.desroches@...el.com>
Subject: [PATCH v3 4/5] ARM: at91/dt: sama5d2 Xplained: enable the adc device

Enable the adc on the sama5d2 Xplained board.

Signed-off-by: Ludovic Desroches <ludovic.desroches@...el.com>
---
 arch/arm/boot/dts/at91-sama5d2_xplained.dts | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm/boot/dts/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
index 77ddff0..c3102a0 100644
--- a/arch/arm/boot/dts/at91-sama5d2_xplained.dts
+++ b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
@@ -261,7 +261,29 @@
 				};
 			};
 
+			adc: adc@...30000 {
+				vddana-supply = <&vdd_3v3_lp_reg>;
+				vref-supply = <&vdd_3v3_lp_reg>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&pinctrl_adc_default>;
+				status = "okay";
+			};
+
 			pinctrl@...38000 {
+				/*
+				 * There is no real pinmux for ADC, if the pin
+				 * is not requested by another peripheral then
+				 * the muxing is done when channel is enabled.
+				 * Requesting pins for ADC is GPIO is
+				 * encouraged to prevent conflicts and to
+				 * disable bias in order to be in the same
+				 * state when the pin is not muxed to the adc.
+				 */
+				pinctrl_adc_default: adc_default {
+					pinmux = <PIN_PD23__GPIO>;
+					bias-disable;
+				};
+
 				pinctrl_flx0_default: flx0_default {
 					pinmux = <PIN_PB28__FLEXCOM0_IO0>,
 						 <PIN_PB29__FLEXCOM0_IO1>;
-- 
2.5.0