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[RFC PATCH 0/3] IIO-based thermal sensor driver for Allwinner H3 SoC

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  [RFC PATCH 0/3] IIO-based thermal sensor driver for Allwinner H3 SoC Icenowy Zheng <icenowy@aosc.io> - 2017-03-28 19:40 +0200
    [RFC PATCH 1/3] dt-bindings: update the Allwinner GPADC device tree binding for H3 Icenowy Zheng <icenowy@aosc.io> - 2017-03-28 19:40 +0200
    [RFC PATCH 3/3] ARM: sun8i: h3: add support for the thermal sensor in H3 Icenowy Zheng <icenowy@aosc.io> - 2017-03-28 19:40 +0200

#1611244 — [RFC PATCH 0/3] IIO-based thermal sensor driver for Allwinner H3 SoC

Allwiner H3 SoC has a thermal sensor, which is a large refactored version of
the old Allwinner "GPADC" (although it have already only thermal part left
in A33).

This patch tried to add support for the sensor in H3 based on the A33
thermal sensor patchset by Quentin Schulz at [1].

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2017-March/495505.html

Icenowy Zheng (3):
  dt-bindings: update the Allwinner GPADC device tree binding for H3
  iio: adc: sun4i-gpadc-iio: add support for H3 thermal sensor
  ARM: sun8i: h3: add support for the thermal sensor in H3

 .../devicetree/bindings/mfd/sun4i-gpadc.txt        |  23 +++-
 arch/arm/boot/dts/sun8i-h3.dtsi                    |  26 +++++
 drivers/iio/adc/sun4i-gpadc-iio.c                  | 130 ++++++++++++++++++---
 include/linux/mfd/sun4i-gpadc.h                    |  33 +++++-
 4 files changed, 188 insertions(+), 24 deletions(-)

-- 
2.12.0

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#1611245 — [RFC PATCH 1/3] dt-bindings: update the Allwinner GPADC device tree binding for H3

Allwinner H3 features a thermal sensor like the one in A33, but has its
register re-arranged, the clock divider moved to CCU (originally the
clock divider is in ADC) and added a pair of bus clock and reset.

Update the binding document to cover H3.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 .../devicetree/bindings/mfd/sun4i-gpadc.txt        | 23 ++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
index badff3611a98..7753133ca0ff 100644
--- a/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
+++ b/Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt
@@ -4,12 +4,20 @@ The Allwinner SoCs all have an ADC that can also act as a thermal sensor
 and sometimes as a touchscreen controller.
 
 Required properties:
-  - compatible: "allwinner,sun8i-a33-ths",
+  - compatible: must contain one of the following compatibles:
+		- "allwinner,sun8i-a33-ths"
+		- "allwinner,sun8i-h3-ths"
   - reg: mmio address range of the chip,
   - #thermal-sensor-cells: shall be 0,
   - #io-channel-cells: shall be 0,
 
-Example:
+Required properties for the following compatibles:
+		- "allwinner,sun8i-h3-ths"
+  - clocks: the bus clock and the input clock of the ADC,
+  - clock-names: should be "bus" and "ths",
+  - resets: the bus reset of the ADC,
+
+Example for A33:
 	ths: ths@01c25000 {
 		compatible = "allwinner,sun8i-a33-ths";
 		reg = <0x01c25000 0x100>;
@@ -17,6 +25,17 @@ Example:
 		#io-channel-cells = <0>;
 	};
 
+Example for H3:
+	ths: ths@01c25000 {
+		compatible = "allwinner,sun8i-h3-ths";
+		reg = <0x01c25000 0x100>;
+		clocks = <&ccu CLK_BUS_THS>, <&ccu CLK_THS>;
+		clock-names = "bus", "ths";
+		resets = <&ccu RST_BUS_THS>;
+		#thermal-sensor-cells = <0>;
+		#io-channel-cells = <0>;
+	};
+
 sun4i, sun5i and sun6i SoCs are also supported via the older binding:
 
 sun4i resistive touchscreen controller
-- 
2.12.0

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#1611246 — [RFC PATCH 3/3] ARM: sun8i: h3: add support for the thermal sensor in H3

As we have gained the support for the thermal sensor in H3, we can now
add its device nodes to the device tree.

Add them to the H3 device tree.

The H5 thermal sensor has some differences, and will be added furtherly.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 arch/arm/boot/dts/sun8i-h3.dtsi | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
index b36f9f423c39..552217bb9266 100644
--- a/arch/arm/boot/dts/sun8i-h3.dtsi
+++ b/arch/arm/boot/dts/sun8i-h3.dtsi
@@ -72,6 +72,32 @@
 		};
 	};
 
+	iio-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&ths>;
+	};
+
+	soc {
+		ths: ths@01c25000 {
+			compatible = "allwinner,sun8i-h3-ths";
+			reg = <0x01c25000 0x100>;
+			clocks = <&ccu CLK_BUS_THS>, <&ccu CLK_THS>;
+			clock-names = "bus", "ths";
+			resets = <&ccu RST_BUS_THS>;
+			#thermal-sensor-cells = <0>;
+			#io-channel-cells = <0>;
+		};
+	};
+
+	thermal-zones {
+		cpu_thermal {
+			/* milliseconds */
+			polling-delay-passive = <250>;
+			polling-delay = <1000>;
+			thermal-sensors = <&ths>;
+		};
+	};
+
 	timer {
 		compatible = "arm,armv7-timer";
 		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
-- 
2.12.0

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