Exynos5420 based Peach PIT board has 4 NTC thermistors to measure temperatures at various points on the board. IIO based ADC becomes the parent and NTC thermistors are the childs, via the HWMON interface. Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx> Cc: Doug Anderson <dianders@xxxxxxxxxxxx> --- Changes since v1: 1. Arranged the ADC node alphabetical 2. Added "status = "okay"" to the ADC node This patch needs 1. MAX77802 PMIC device tree nodes (for ldo9) https://www.mail-archive.com/devicetree@xxxxxxxxxxxxxxx/msg31430.html 2. Uses the DT documentation for NTC thermistors updated with vendor-prefix This patch set is tested 1. On Peach PIT board via sysfs entry exposed by hwmon localhost ~ # cat /sys/class/hwmon/hwmon*/device/temp1_input 37436 36449 38560 38059 2. Backward compatibility is tested by replacing "murata" with "ntc" in the dts nodes and running the above test. arch/arm/boot/dts/exynos5420-peach-pit.dts | 34 ++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts index b96a66a..19d733d 100644 --- a/arch/arm/boot/dts/exynos5420-peach-pit.dts +++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts @@ -101,6 +101,40 @@ }; }; +&adc { + status = "okay"; + vdd-supply = <&ldo9_reg>; + + ncp15wb473@3 { + compatible = "murata,ncp15wb473"; + pullup-uv = <1800000>; + pullup-ohm = <47000>; + pulldown-ohm = <0>; + io-channels = <&adc 3>; + }; + ncp15wb473@4 { + compatible = "murata,ncp15wb473"; + pullup-uv = <1800000>; + pullup-ohm = <47000>; + pulldown-ohm = <0>; + io-channels = <&adc 4>; + }; + ncp15wb473@5 { + compatible = "murata,ncp15wb473"; + pullup-uv = <1800000>; + pullup-ohm = <47000>; + pulldown-ohm = <0>; + io-channels = <&adc 5>; + }; + ncp15wb473@6 { + compatible = "murata,ncp15wb473"; + pullup-uv = <1800000>; + pullup-ohm = <47000>; + pulldown-ohm = <0>; + io-channels = <&adc 6>; + }; +}; + &dp { status = "okay"; pinctrl-names = "default"; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
