From f58d47258131aa2d0243fc1dc78e2adc578d5de4 Mon Sep 17 00:00:00 2001 From: Mikko Perttunen Date: Tue, 6 Jan 2015 12:52:56 +0200 Subject: 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: Mikko Perttunen Signed-off-by: Thierry Reding --- .../bindings/arm/tegra/nvidia,tegra20-pmc.txt | 26 ++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'Documentation/devicetree/bindings/arm/tegra') diff --git a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt index 68ac65f82a1c..2fd50511ab4b 100644 --- a/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt +++ b/Documentation/devicetree/bindings/arm/tegra/nvidia,tegra20-pmc.txt @@ -47,6 +47,23 @@ 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-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: / SoC dts including file @@ -68,6 +85,15 @@ pmc@7000f400 { / 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 { compatible = "simple-bus"; -- cgit v1.2.3-59-g8ed1b