linux-kernel - Re: [PATCHv4 1/3] dt-bindings: input: add pwm-vibrator

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Date:   Mon, 24 Jul 2017 21:20:17 +0200
From:   Pavel Machek <pavel@....cz>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>, linux-input@...r.kernel.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 1/3] dt-bindings: input: add pwm-vibrator

On Fri 2017-07-14 12:01:49, Sebastian Reichel wrote:
> Add DT binding document for PWM controlled vibrator devices.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>

Acked-by: Pavel Machek <pavel@....cz>

> index 000000000000..09145d18491d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/pwm-vibrator.txt
> @@ -0,0 +1,66 @@
> +* PWM vibrator device tree bindings
> +
> +Registers a PWM device as vibrator. It is expected, that the vibrator's
> +strength increases based on the duty cycle of the enable PWM channel
> +(100% duty cycle meaning strongest vibration, 0% meaning no vibration).
> +
> +The binding supports an optional direction PWM channel, that can be
> +driven at fixed duty cycle. If available this is can be used to increase
> +the vibration effect of some devices.

Actually what "direction" does would be nice to explain, because I
don't know. Does it make the motor turn the other way around?

> +Required properties:
> +- compatible: should contain "pwm-vibrator"

should->Should.

> +- pwm-names: Should contain "enable" and optionally "direction"
> +- pwms: Should contain a PWM handle for each entry in pwm-names
> +
> +Optional properties:
> +- vcc-supply: Phandle for the regulator supplying power
> +- direction-duty-cycle-ns: Duty cycle of the direction PWM channel in
> +                           nanoseconds, defaults to 50% of the channel's
> +			   period.

Is nanoseconds right unit here? It drives a motor...

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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