[PATCH 5/6] arm64: versal-net: Add SysMon and thermal zone

[Amit Kumar Mahapatra]

Describe the System Monitor (SysMon) block in the PMC, which provides
on-chip voltage and temperature monitoring, and use its device
temperature channel as the sensor for a thermal zone.

SysMon channel 0 is the current maximum temperature across all active
satellites.

The thermal zone has a critical trip at 125C. Passive trips and cooling
maps, voltage channels and per-satellite temperature channels depend on
the design and are left to board files.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra at amd.com>
---
 arch/arm64/boot/dts/xilinx/versal-net.dtsi | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/arm64/boot/dts/xilinx/versal-net.dtsi b/arch/arm64/boot/dts/xilinx/versal-net.dtsi
index 21bb917bcba1..394181c9a751 100644
--- a/arch/arm64/boot/dts/xilinx/versal-net.dtsi
+++ b/arch/arm64/boot/dts/xilinx/versal-net.dtsi
@@ -735,6 +735,28 @@ versal_fpga: versal-fpga {
 		compatible = "xlnx,versal-fpga";
 	};
 
+	sysmon_temp: thermal-sensor {
+		compatible = "generic-adc-thermal";
+		#thermal-sensor-cells = <0>;
+		io-channels = <&sysmon0 0>;
+		io-channel-names = "sensor-channel";
+	};
+
+	thermal-zones {
+		versal_thermal: versal-thermal {
+			polling-delay = <1000>; /* milliseconds */
+			thermal-sensors = <&sysmon_temp>;
+
+			trips {
+				ot_crit: ot-crit {
+					temperature = <125000>; /* millicelsius */
+					hysteresis = <0>; /* millicelsius */
+					type = "critical";
+				};
+			};
+		};
+	};
+
 	amba: axi {
 		compatible = "simple-bus";
 		bootph-all;
@@ -1033,6 +1055,13 @@ spi1: spi at f1970000 {
 			clock-names = "ref_clk", "pclk";
 		};
 
+		sysmon0: sysmon at f1270000 {
+			compatible = "xlnx,versal-sysmon";
+			reg = <0 0xf1270000 0 0x4000>;
+			interrupts = <0 202 4>;
+			#io-channel-cells = <1>;
+		};
+
 		ttc0: timer at f1dc0000 {
 			compatible = "cdns,ttc";
 			status = "disabled";
-- 
2.34.1