Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1618195
| From | Laxman Dewangan <ldewangan@nvidia.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH V3 3/4] pwm: tegra: Add DT binding details to configure pin in suspends/resume |
| Date | 2017-04-06 19:10 +0200 |
| Message-ID | <ttj50-3IL-7@gated-at.bofh.it> (permalink) |
| References | <ttgTv-1Cx-3@gated-at.bofh.it> <ttgTw-1Cx-19@gated-at.bofh.it> <tthwe-2kW-17@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thursday 06 April 2017 08:56 PM, Jon Hunter wrote:
> On 06/04/17 15:21, 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
> s/form/from/
> s/define/defines/
>
>> one of the state of PWM regulator which needs to be configure in
>> suspend state of system.
> It maybe clearer to say that when the system enters suspend the
> regulator requires the pwm output to be tristated.
Not necessarily that every PWM regulator interfaces needs it. It
depends on the devices.
So I will say:
When system enters suspend, in some of PWM regulator interface, it is
required to to set the PWM output to be tristated.
> pwm: pwm@7000a000 {
> @@ -29,3 +42,33 @@ Example:
> resets = <&tegra_car 17>;
> reset-names = "pwm";
> };
> +
> +
> +Example with the pin configuration for suspend and resume:
> +=========================================================
> +Pin PE7 is used as PWM interface.
> Nit-pick. On what devices? Sounds like this is verbatim. Maybe state
> what device this is an example for.
Let me phrase it as:
Suppose pin PE7 (On tegra210) interfaced with the regulator device and
this requires PWM output to be tristated when system enters suspend.
Following will be DT binding to achieve this:
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH V3 3/4] pwm: tegra: Add DT binding details to configure pin in suspends/resume Laxman Dewangan <ldewangan@nvidia.com> - 2017-04-06 16:50 +0200
Re: [PATCH V3 3/4] pwm: tegra: Add DT binding details to configure pin in suspends/resume Jon Hunter <jonathanh@nvidia.com> - 2017-04-06 17:30 +0200
Re: [PATCH V3 3/4] pwm: tegra: Add DT binding details to configure pin in suspends/resume Laxman Dewangan <ldewangan@nvidia.com> - 2017-04-06 19:10 +0200
Re: [PATCH V3 3/4] pwm: tegra: Add DT binding details to configure pin in suspends/resume Jon Hunter <jonathanh@nvidia.com> - 2017-04-07 10:00 +0200
csiph-web