Commit f58d4725 authored by Mikko Perttunen's avatar Mikko Perttunen Committed by Thierry Reding
Browse files

of: Add descriptions of thermtrip properties to Tegra PMC bindings 



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: default avatarMikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent a9a40a4a

Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt

+26 −0
Original line number Original line Diff line number Diff line
@@ -47,6 +47,23 @@ Required properties when nvidia,suspend-mode=<0>: 
  sleep mode, the warm boot code will restore some PLLs, clocks and then

  sleep mode, the warm boot code will restore some PLLs, clocks and then

  bring up CPU0 for resuming the system.

  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-controller-id : ID of I2C controller to send poweroff command to. Valid values are

                             described in section 9.2.148 "APBDEV_PMC_SCRATCH53_0" of the

                             Tegra K1 Technical Reference Manual.

- 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:

Example:





/ SoC dts including file

/ SoC dts including file
@@ -68,6 +85,15 @@ pmc@7000f400 { 




/ Tegra board dts file

/ Tegra board dts file

{

{

	...

	pmc@7000f400 {

		i2c-thermtrip {

			nvidia,i2c-controller-id = <4>;

			nvidia,bus-addr = <0x40>;

			nvidia,reg-addr = <0x36>;

			nvidia,reg-data = <0x2>;

		};

	};

	...

	...

	clocks {

	clocks {

		compatible = "simple-bus";

		compatible = "simple-bus";