From bb2de9a333d17bb1b048ad208002501226b83f03 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Tue, 6 Jun 2017 08:07:28 +0200 Subject: dts: update to v4.12-rc1 Signed-off-by: Sascha Hauer --- dts/Bindings/pwm/nvidia,tegra20-pwm.txt | 45 +++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) (limited to 'dts/Bindings/pwm/nvidia,tegra20-pwm.txt') diff --git a/dts/Bindings/pwm/nvidia,tegra20-pwm.txt b/dts/Bindings/pwm/nvidia,tegra20-pwm.txt index b4e73778dd..c57e11b8d9 100644 --- a/dts/Bindings/pwm/nvidia,tegra20-pwm.txt +++ b/dts/Bindings/pwm/nvidia,tegra20-pwm.txt @@ -19,6 +19,19 @@ Required properties: - reset-names: Must include the following entries: - pwm +Optional properties: +============================ +In some of the interface like PWM based regulator device, it is required +to configure the pins differently in different states, especially in suspend +state of the system. The configuration of pin is provided via the pinctrl +DT node as detailed in the pinctrl DT binding document + Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt + +The PWM node will have following optional properties. +pinctrl-names: Pin state names. Must be "default" and "sleep". +pinctrl-0: phandle for the default/active state of pin configurations. +pinctrl-1: phandle for the sleep state of pin configurations. + Example: pwm: pwm@7000a000 { @@ -29,3 +42,35 @@ Example: resets = <&tegra_car 17>; reset-names = "pwm"; }; + + +Example with the pin configuration for suspend and resume: +========================================================= +Suppose pin PE7 (On Tegra210) interfaced with the regulator device and +it requires PWM output to be tristated when system enters suspend. +Following will be DT binding to achieve this: + +#include + + pinmux@700008d4 { + pwm_active_state: pwm_active_state { + pe7 { + nvidia,pins = "pe7"; + nvidia,tristate = ; + }; + }; + + pwm_sleep_state: pwm_sleep_state { + pe7 { + nvidia,pins = "pe7"; + nvidia,tristate = ; + }; + }; + }; + + pwm@7000a000 { + /* Mandatory PWM properties */ + pinctrl-names = "default", "sleep"; + pinctrl-0 = <&pwm_active_state>; + pinctrl-1 = <&pwm_sleep_state>; + }; -- cgit v1.2.3