dt-bindings: fsl: scu: add thermal binding

NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as
system controller, the system controller is in charge of system
power, clock and thermal sensors etc. management, Linux kernel
has to communicate with system controller via MU (message unit)
IPC to get temperature from thermal sensors, this patch adds
binding doc for i.MX system controller thermal driver.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1582330132-13461-1-git-send-email-Anson.Huang@nxp.com

diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
index e07735a8c2c792b34b3b2a105dceedba869faa71..7f42cc37038ec700bbbd58de186bbfda2c375503 100644 (file)
--- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -166,6 +166,17 @@ Required properties:
               followed by "fsl,imx-sc-key";
 - linux,keycodes: See Documentation/devicetree/bindings/input/keys.txt
 
+Thermal bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+Required properties:
+- compatible:                  Should be :
+                                 "fsl,imx8qxp-sc-thermal"
+                               followed by "fsl,imx-sc-thermal";
+
+- #thermal-sensor-cells:       See Documentation/devicetree/bindings/thermal/thermal.txt
+                               for a description.
+
 Example (imx8qxp):
 -------------
 aliases {
@@ -238,6 +249,11 @@ firmware {
                        compatible = "fsl,imx8qxp-sc-wdt", "fsl,imx-sc-wdt";
                        timeout-sec = <60>;
                };
+
+               tsens: thermal-sensor {
+                       compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-thermal";
+                       #thermal-sensor-cells = <1>;
+               };
        };
 };