ARM: dts: thermal: exynos: Add documentation for Exynos SoC thermal bindings

Proper description for Exynos4 bindings added to Documentation/devicetree/
bindings. It adds description to use multiple TMU instances, optional voltage
supply node and optional shared register across multiple TMU's.

Acked-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: Eduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
new file mode 100644
index 000000000000..284f5300fd8b
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
@@ -0,0 +1,55 @@
+* Exynos Thermal Management Unit (TMU)
+
+** Required properties:
+
+- compatible : One of the following:
+               "samsung,exynos4412-tmu"
+               "samsung,exynos4210-tmu"
+               "samsung,exynos5250-tmu"
+               "samsung,exynos5440-tmu"
+- interrupt-parent : The phandle for the interrupt controller
+- reg : Address range of the thermal registers. For soc's which has multiple
+        instances of TMU and some registers are shared across all TMU's like
+        interrupt related then 2 set of register has to supplied. First set
+        belongs to each instance of TMU and second set belongs to common TMU
+        registers.
+- interrupts : Should contain interrupt for thermal system
+- clocks : The main clock for TMU device
+- clock-names : Thermal system clock name
+- vtmu-supply: This entry is optional and provides the regulator node supplying
+                voltage to TMU. If needed this entry can be placed inside
+                board/platform specific dts file.
+
+Example 1):
+
+        tmu@100C0000 {
+                compatible = "samsung,exynos4412-tmu";
+                interrupt-parent = <&combiner>;
+                reg = <0x100C0000 0x100>;
+                interrupts = <2 4>;
+                clocks = <&clock 383>;
+                clock-names = "tmu_apbif";
+                status = "disabled";
+                vtmu-supply = <&tmu_regulator_node>;
+        };
+
+Example 2):
+
+        tmuctrl_0: tmuctrl@160118 {
+                compatible = "samsung,exynos5440-tmu";
+                reg = <0x160118 0x230>, <0x160368 0x10>;
+                interrupts = <0 58 0>;
+                clocks = <&clock 21>;
+                clock-names = "tmu_apbif";
+        };
+
+Note: For multi-instance tmu each instance should have an alias correctly
+numbered in "aliases" node.
+
+Example:
+
+aliases {
+        tmuctrl0 = &tmuctrl_0;
+        tmuctrl1 = &tmuctrl_1;
+        tmuctrl2 = &tmuctrl_2;
+};