linux-kernel - [PATCH v3 1/5] of: Add descriptions of thermtrip properties to Tegra PMC bindings

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Message-Id: <1409993685-21911-2-git-send-email-cyndis@kapsi.fi>
Date:	Sat,  6 Sep 2014 11:54:41 +0300
From:	Mikko Perttunen <cyndis@...si.fi>
To:	swarren@...dotorg.org, thierry.reding@...il.com
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-tegra@...r.kernel.org, wni@...dia.com,
	Mikko Perttunen <mperttunen@...dia.com>
Subject: [PATCH v3 1/5] of: Add descriptions of thermtrip properties to Tegra PMC bindings

From: Mikko Perttunen <mperttunen@...dia.com>

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@...dia.com>
Reviewed-by: Wei Ni <wni@...dia.com>
Tested-by: Wei Ni <wni@...dia.com>
---
v3
- replaced nvidia,pmu with nvidia,{i2c-bus,bus-addr}
- documented nvidia,pinmux-id

 .../bindings/arm/tegra/nvidia,tegra20-pmc.txt      | 23 ++++++++++++++++++++++
 1 file changed, 23 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..1d4e94a 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 +84,14 @@ pmc@...0f400 {
 / Tegra board dts file
 {
 	...
+	pmc@...0f400 {
+		i2c-thermtrip {
+			nvidia,pmu = <&pmic>;
+			nvidia,reg-addr = <0x36>;
+			nvidia,reg-data = <0x2>;
+		};
+	};
+	...
 	clocks {
 		compatible = "simple-bus";
 		#address-cells = <1>;
-- 
2.1.0

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