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[PATCH] thermal: Add Mediatek thermal support

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  [PATCH] thermal: Add Mediatek thermal support Sascha Hauer <s.hauer@pengutronix.de> - 2015-07-13 12:40 +0200
    [PATCH 1/3] dt-bindings: thermal: Add binding document for Mediatek thermal controller Sascha Hauer <s.hauer@pengutronix.de> - 2015-07-13 12:40 +0200
    [PATCH 3/3] ARM64: dts: mt8173: Add thermal/auxadc device nodes Sascha Hauer <s.hauer@pengutronix.de> - 2015-07-13 12:40 +0200

#1182707 — [PATCH] thermal: Add Mediatek thermal support

This series adds support for the thermal sensors included in the
MT8173 SoC. Currently only basic temperature reading is supported
without any interrupt support.

The cpufreq driver for MT8173 is currently under review, so there's no
real cooling device available in mainline. Until this is available the
thermal driver can be tested with the following dts snippet. It creates
a fake gpio fan and a fake trip point which is so low that it can easily
be reached with a "cat /dev/zero > /dev/null" on the command line.

Please review and let me know what's missing to be included in mainline.

Sascha

	fan: gpio_fan {
		compatible = "gpio-fan";
		gpios = <&pio 24 0>;
		gpio-fan,speed-map = <0    0
				      4500 1>;
		#cooling-cells = <2>;
	};

	thermal-zones {
		cpu_thermal: cpu_thermal {
			polling-delay-passive = <1000>; /* milliseconds */
			polling-delay = <1000>; /* milliseconds */

			thermal-sensors = <&thermal 0>;

			trips {
				cpu_passive: cpu_passive {
					temperature = <47000>; /* millicelsius */
					hysteresis = <2000>; /* millicelsius */
					type = "passive";
				};

				cpu_crit {
					temperature = <90000>; /* millicelsius */
					hysteresis = <2000>; /* millicelsius */
					type = "critical";
				};
			};

			cooling-maps {
				map0 {
					trip = <&cpu_passive>;
					cooling-device = <&fan THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
				};
			};
		};
	};

----------------------------------------------------------------
Sascha Hauer (3):
      dt-bindings: thermal: Add binding document for Mediatek thermal controller
      thermal: Add Mediatek thermal controller support
      ARM64: dts: mt8173: Add thermal/auxadc device nodes

 .../bindings/thermal/mediatek-thermal.txt          |  38 ++
 arch/arm64/boot/dts/mediatek/mt8173.dtsi           |  18 +
 drivers/thermal/Kconfig                            |   8 +
 drivers/thermal/Makefile                           |   1 +
 drivers/thermal/mtk_thermal.c                      | 602 +++++++++++++++++++++
 5 files changed, 667 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
 create mode 100644 drivers/thermal/mtk_thermal.c
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#1182708 — [PATCH 1/3] dt-bindings: thermal: Add binding document for Mediatek thermal controller

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 .../bindings/thermal/mediatek-thermal.txt          | 38 ++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/mediatek-thermal.txt

diff --git a/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt b/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
new file mode 100644
index 0000000..d90e4dc
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
@@ -0,0 +1,38 @@
+* Mediatek Thermal
+
+This describes the device tree binding for the Mediatek thermal controller
+which measures the on-SoC temperatures. This device does not have its own ADC,
+instead it directly controls the AUXADC via AHB bus accesses. For this reason
+this device needs phandles to the AUXADC. Also it controls a mux in the
+apmixedsys register space via AHB bus accesses, so a phandle to the APMIXEDSYS
+is also needed.
+
+Required properties:
+- compatible: "mediatek,mt8173-thermal"
+- reg: Address range of the thermal controller
+- interrupts: IRQ for the thermal controller
+- clocks, clock-names: Clocks needed for the thermal controller. required
+                       clocks are:
+		"therm":	Main clock needed for register access
+		"auxadc":	The AUXADC clock
+- resets, reset-names: Reference to the reset controller controlling the thermal
+                       controller. Required reset-names:
+		"therm":	The main reset line
+- auxadc: A phandle to the AUXADC which the thermal controller uses
+- apmixedsys: A phandle to the APMIXEDSYS controller.
+- #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description
+
+Example:
+
+	thermal: thermal@1100b000 {
+		#thermal-sensor-cells = <1>;
+		compatible = "mediatek,mt8173-thermal";
+		reg = <0 0x1100b000 0 0x1000>;
+		interrupts = <0 70 IRQ_TYPE_LEVEL_LOW>;
+		clocks = <&pericfg CLK_PERI_THERM>, <&pericfg CLK_PERI_AUXADC>;
+		clock-names = "therm", "auxadc";
+		resets = <&pericfg MT8173_PERI_THERM_SW_RST>;
+		reset-names = "therm";
+		auxadc = <&auxadc>;
+		apmixedsys = <&apmixedsys>;
+	};
-- 
2.1.4

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#1182709 — [PATCH 3/3] ARM64: dts: mt8173: Add thermal/auxadc device nodes

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/arm64/boot/dts/mediatek/mt8173.dtsi | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
index 27237a1..8cd114a 100644
--- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
@@ -151,6 +151,11 @@
 				(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>;
 		};
 
+		auxadc: auxadc@11001000 {
+			compatible = "mediatek,mt8173-auxadc";
+			reg = <0 0x11001000 0 0x1000>;
+		};
+
 		uart0: serial@11002000 {
 			compatible = "mediatek,mt8173-uart",
 				     "mediatek,mt6577-uart";
@@ -186,6 +191,19 @@
 			clocks = <&uart_clk>;
 			status = "disabled";
 		};
+
+		thermal: thermal@1100b000 {
+			#thermal-sensor-cells = <1>;
+			compatible = "mediatek,mt8173-thermal";
+			reg = <0 0x1100b000 0 0x1000>;
+			interrupts = <0 70 IRQ_TYPE_LEVEL_LOW>;
+			clocks = <&pericfg CLK_PERI_THERM>, <&pericfg CLK_PERI_AUXADC>;
+			clock-names = "therm", "auxadc";
+			resets = <&pericfg MT8173_PERI_THERM_SW_RST>;
+			reset-names = "therm";
+			auxadc = <&auxadc>;
+			apmixedsys = <&apmixedsys>;
+		};
 	};
 };
 
-- 
2.1.4

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