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

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Hi Chanwoo,

On 11.03.2014 08:54, Chanwoo Choi wrote:
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.


Those properties are well-defined in "ntc,ncp15wb473" DT bindings documentation. There is no need to repeat them here.

Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
---
  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@126C0000 {
+		vdd-supply = <&ldo3_reg>;
+		status = "okay";
+
+		ncp15wb473@0 {

style: Nodes should have generic names, e.g. thermistor@0.

Also if node name is suffixed with @unit-address, then the node should have a reg property with its first entry corresponding to the unit-address. Now there is no physical unit-address definition for those thermistors, so they shouldn't use this naming pattern, but rather something like "thermistor-0" or "thermistor-ap".

+			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 */
+		};

Anyway, I don't think it is correct to place IIO consumers under IIO provider node, because IIO is not a control bus, but rather a resource provider, like GPIO, clock, etc. So both thermistor nodes should be placed outside the adc node. (They might be grouped in a simple-bus subnode, though, to improve readability.)

Best regards,
Tomasz
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