[PATCH 4/4] ARM: DTS: Add NTC thermistor nodes as child nodes to ADC

Exynos5420 based Peach PIT and Exynos5800 based PI boards have
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 <redacted>
Cc: Doug Anderson <dianders@chromium.org>
---
This patch needs
1. MAX77802 PMIC device tree nodes (for ldo9)
   https://www.mail-archive.com/devicetree at vger.kernel.org/msg31430.html
2. Uses the DT documentation for NTC thermistors updated with vendor-prefix

 arch/arm/boot/dts/exynos5420-peach-pit.dts |   32 ++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
index b96a66a..852a220 100644
--- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
+++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts

@@ -751,4 +751,36 @@
 	timeout-sec = <32>;
 };
 
+&adc {
+	vdd-supply = <&ldo9_reg>;
+	ncp15wb473 at 3 {
+		compatible = "murata,ncp15wb473";
+		pullup-uv = <1800000>;
+		pullup-ohm = <47000>;
+		pulldown-ohm = <0>;
+		io-channels = <&adc 3>;
+	};
+	ncp15wb473 at 4 {
+		compatible = "murata,ncp15wb473";
+		pullup-uv = <1800000>;
+		pullup-ohm = <47000>;
+		pulldown-ohm = <0>;
+		io-channels = <&adc 4>;
+	};
+	ncp15wb473 at 5 {
+		compatible = "murata,ncp15wb473";
+		pullup-uv = <1800000>;
+		pullup-ohm = <47000>;
+		pulldown-ohm = <0>;
+		io-channels = <&adc 5>;
+	};
+	ncp15wb473 at 6 {
+		compatible = "murata,ncp15wb473";
+		pullup-uv = <1800000>;
+		pullup-ohm = <47000>;
+		pulldown-ohm = <0>;
+		io-channels = <&adc 6>;
+	};
+};
+
 #include "cros-ec-keyboard.dtsi"

-- 
1.7.9.5

Naveen,

On Tue, Jun 24, 2014 at 5:19 AM, Naveen Krishna Chatradhi
[off-list ref] wrote:

Exynos5420 based Peach PIT and Exynos5800 based PI boards have
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 <redacted>
Cc: Doug Anderson <dianders@chromium.org>
---
This patch needs
1. MAX77802 PMIC device tree nodes (for ldo9)
   https://www.mail-archive.com/devicetree at vger.kernel.org/msg31430.html
2. Uses the DT documentation for NTC thermistors updated with vendor-prefix

 arch/arm/boot/dts/exynos5420-peach-pit.dts |   32 ++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

* You forgot: status="okay" for the ADC.  One might question how this
patch was tested.

* Please also include this change for pi.

* We just got through the painful process of sorting this .dts file.
Please sort "&adc" alphabetically.  Kukjin: please confirm that you
will keep an eye on patches and make sure that they are sorted OK.


Other than those problems this seems to work fine to me.

-Doug