From: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Hardware-triggered thermal reset requires configuring the I2C
reset procedure. This configuration is read from the device tree,
so document the relevant properties in the binding documentation.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Reviewed-by: Wei Ni <wni@xxxxxxxxxx>
Tested-by: Wei Ni <wni@xxxxxxxxxx>
---
v4:
- update example too *facepalm*
.../bindings/arm/tegra/nvidia,tegra20-pmc.txt | 24 ++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
index 68ac65f..dc13fb0 100644
--- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
+++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt
@@ -47,6 +47,21 @@ Required properties when nvidia,suspend-mode=<0>:
sleep mode, the warm boot code will restore some PLLs, clocks and then
bring up CPU0 for resuming the system.
+Hardware-triggered thermal reset:
+On Tegra30, Tegra114 and Tegra124, if the 'i2c-thermtrip' subnode exists,
+hardware-triggered thermal reset will be enabled.
+
+Required properties for hardware-triggered thermal reset (inside 'i2c-thermtrip'):
+- nvidia,i2c-bus : Phandle to I2C bus containing the PMU
+- nvidia,bus-addr : Bus address of the PMU on the I2C bus
+- nvidia,reg-addr : I2C register address to write poweroff command to
+- nvidia,reg-data : Poweroff command to write to PMU
+
+Optional properties for hardware-triggered thermal reset (inside 'i2c-thermtrip'):
+- nvidia,pinmux-id : Pinmux used by the hardware when issuing poweroff command.
+ Defaults to 0. Valid values are described in section 12.5.2
+ "Pinmux Support" of the Tegra4 Technical Reference Manual.
+
Example:
/ SoC dts including file
@@ -69,6 +84,15 @@ pmc@7000f400 {
/ Tegra board dts file
{
...
+ pmc@7000f400 {
+ i2c-thermtrip {
+ nvidia,i2c-bus = <&pmic_bus>;
+ nvidia,bus-addr = <0x40>;
+ nvidia,reg-addr = <0x36>;
+ nvidia,reg-data = <0x2>;
+ };
+ };
+ ...
clocks {
compatible = "simple-bus";
#address-cells = <1>;
--
2.1.0
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