linux-kernel - [PATCH 5/5] ARM: dts: exynos4412-trats2: Add ADC's dt data to get temperature of SoC/battery

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Message-id: <1394524494-30641-6-git-send-email-cw00.choi@samsung.com>
Date:	Tue, 11 Mar 2014 16:54:54 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	kgene.kim@...sung.com, t.figa@...sung.com
Cc:	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, kyungmin.park@...sung.com,
	rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
	swarren@...dotorg.org, ijc+devicetree@...lion.org.uk,
	linux@....linux.org.uk, Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCH 5/5] ARM: dts: exynos4412-trats2: Add ADC's dt data to get
 temperature of SoC/battery

This patch use ADC to get the temperature of SoC/battery by using NTC thermistor
driver in hwmon. NTC thermistor driver covnvert ADC's raw data to temperature
by using following variables:

- pullup-uv    : Voltage
- pullup-ohm   : Pull-up resistance
- pulldown-ohm : Pull-down resistance
- io-channels  : It means ADC channel.

Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 arch/arm/boot/dts/exynos4412-trats2.dts | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4412-trats2.dts b/arch/arm/boot/dts/exynos4412-trats2.dts
index 4f851cc..fc517c3 100644
--- a/arch/arm/boot/dts/exynos4412-trats2.dts
+++ b/arch/arm/boot/dts/exynos4412-trats2.dts
@@ -106,6 +106,27 @@
 		};
 	};
 
+	adc: adc@...C0000 {
+		vdd-supply = <&ldo3_reg>;
+		status = "okay";
+
+		ncp15wb473@0 {
+			compatible = "ntc,ncp15wb473";
+			pullup-uv = <1800000>;	 /* VCC_1.8V_AP */
+			pullup-ohm = <100000>;	 /* 100K */
+			pulldown-ohm = <100000>; /* 100K */
+			io-channels = <&adc 1>;  /* AP temperature */
+		};
+
+		ncp15wb473@1 {
+			compatible = "ntc,ncp15wb473";
+			pullup-uv = <1800000>;	 /* VCC_1.8V_AP */
+			pullup-ohm = <100000>;	 /* 100K */
+			pulldown-ohm = <100000>; /* 100K */
+			io-channels = <&adc 2>;  /* Battery temperature */
+		};
+	};
+
 	i2c@...90000 {
 		samsung,i2c-sda-delay = <100>;
 		samsung,i2c-slave-addr = <0x10>;
-- 
1.8.0

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