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@xxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
---
ChangeLog since V5:
- add "imx,sensor-resource-id" in each thermal zone to pass resource ID for thermal driver.
---
.../devicetree/bindings/arm/freescale/fsl,scu.txt | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
index 72d481c..4b79751 100644
--- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -122,6 +122,20 @@ RTC bindings based on SCU Message Protocol
Required properties:
- compatible: should be "fsl,imx8qxp-sc-rtc";
+Thermal bindings based on SCU Message Protocol
+------------------------------------------------------------
+
+Required properties:
+- compatible : Must be "fsl,imx8qxp-sc-thermal";
+- tsens-num : Total number of thermal sensors supported;
+- #thermal-sensor-cells : Should be 1. See
+ Documentation/devicetree/bindings/thermal/thermal.txt
+ for a description.
+- imx,sensor-resource-id : This property should be defined in each thermal zone
+ of thermal-zones node, it passes each thermal zone's
+ resource id for thermal driver to get temperature via
+ SCU IPC.
+
Example (imx8qxp):
-------------
lsio_mu1: mailbox@5d1c0000 {
@@ -168,6 +182,12 @@ firmware {
rtc: rtc {
compatible = "fsl,imx8qxp-sc-rtc";
};
+
+ tsens: thermal-sensor {
+ compatible = "fsl,imx8qxp-sc-thermal";
+ tsens-num = <1>;
+ #thermal-sensor-cells = <1>;
+ };
};
};
--
2.7.4
