On 05/04/17 15:13, Laxman Dewangan wrote: > In some of NVIDIA Tegra's platform, PWM controller is used to > control the PWM controlled regulators. PWM signal is connected to > the VID pin of the regulator where duty cycle of PWM signal decide > the voltage level of the regulator output. > > The tristate (high impedance of PWM pin form Tegra) also define > one of the state of PWM regulator which needs to be configure in > suspend state of system. > > Add DT binding details to provide the pin configuration state > from PWM and pinctrl DT node in suspend and active state of > the system. > > Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx> > --- > .../devicetree/bindings/pwm/nvidia,tegra20-pwm.txt | 43 ++++++++++++++++++++++ > 1 file changed, 43 insertions(+) > > diff --git a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt b/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt > index b4e7377..145c323 100644 > --- a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt > +++ b/Documentation/devicetree/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 regualator device, it is required > +to configure the pins diffrently in different states, specially in suspend s/diffrently/differently s/specially/especially > +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 "suspend" and "resume". Why not just use the pre-defined names here? There is a pre-defined name for "default", "idle" and "sleep" and then you can use the following APIs and avoid the lookup of the state ... pinctrl_pm_select_default_state() pinctrl_pm_select_idle_state() pinctrl_pm_select_sleep_state() Note for i2c [0][1], I used "default" as the active/on state (which I know is not that descriptive) and then used 'idle' as the suspended state. This way we don't need any custom names. Cheers Jon [0] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/i2c/busses/i2c-tegra.c?id=718917b9875fcfa6450e7274d2727c4680c3591a [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/boot/dts/nvidia/tegra210.dtsi?id=66b2d6e9c93bc5bed55afda80c84bf0325c14ad4 -- nvpublic -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
