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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