The Exynos4412 has a Thermal Management Unit (TMU) which provides
a temperature sensor and related functionality.
This must be enabled on a per-board basis, as it requires a 100k
resistance to ground on the XtsRES_EXT pin, as well as a 1.8V input on
VDD18_TS pin. If that voltage is not supplied, the machine immediately
reports a maximum temperature of 255C and triggers the thermal subsystem
to shut down the system.
This patch also enables the TMU on the ODROID boards via the appropriate
power supply.
Signed-off-by: Daniel Drake <dr...@endlessm.com>
---
arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 5 +++++
arch/arm/boot/dts/exynos4412.dtsi | 10 ++++++++++
2 files changed, 15 insertions(+)
diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
index 3d8c623..9994a44 100644
--- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
+++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
@@ -400,3 +400,8 @@
samsung,pin-drv = <0>;
};
};
+
+&tmu {
+ status = "okay";
+ vtmu-supply = <&ldo10_reg>;
+};
diff --git a/arch/arm/boot/dts/exynos4412.dtsi
b/arch/arm/boot/dts/exynos4412.dtsi
index 0f6ec93..ee58e7f 100644
--- a/arch/arm/boot/dts/exynos4412.dtsi
+++ b/arch/arm/boot/dts/exynos4412.dtsi
@@ -66,4 +66,14 @@
pmu_system_controller: system-controller@10020000 {
compatible = "samsung,exynos4412-pmu", "syscon";
};
+
+ tmu: tmu@100C0000 {
+ compatible = "samsung,exynos4412-tmu";
+ interrupt-parent = <&combiner>;
+ reg = <0x100C0000 0x100>;
+ interrupts = <2 4>;
+ clocks = <&clock CLK_TMU_APBIF>;
+ clock-names = "tmu_apbif";
+ status = "disabled";
+ };
};
--
1.9.1
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