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>
---
Changes since V9:
- change #thermal-sensor-cells value in example to 1, since there are other
thermal sensors inside system controller, it is just because there are still
some issue, so system controller does NOT expose them for now, they could
be exposed later, so it should be 1 from HW perspective.
---
.../devicetree/bindings/arm/freescale/fsl,scu.txt | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
index 72d481c..855270b 100644
--- a/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
+++ b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.txt
@@ -122,6 +122,21 @@ 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: 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.
+
+- imx,sensor-resource-id: A single integer for single thermal zone's resource ID or
+ an array of integers to specify each thermal zone's sensor
+ resource ID.
+
Example (imx8qxp):
-------------
lsio_mu1: mailbox@5d1c0000 {
@@ -168,6 +183,12 @@ firmware {
rtc: rtc {
compatible = "fsl,imx8qxp-sc-rtc";
};
+
+ tsens: thermal-sensor {
+ compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-thermal";
+ #thermal-sensor-cells = <1>;
+ imx,sensor-resource-id = <IMX_SC_R_SYSTEM>;
+ };
};
};
--
2.7.4
