Messages in this thread | | | Subject | Re: [PATCH v13 2/4] arm64: dts: fsl: librem5: Add a device tree for the Librem5 devkit | Date | Thu, 23 May 2019 14:52:56 -0700 | From | Angus Ainslie <> |
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Hi Pavel,
On 2019-05-23 12:19, Pavel Machek wrote: > Hi! > >> This is for the development kit board for the Librem 5. The current >> level >> of support yields a working console and is able to boot userspace from >> the network or eMMC. >> >> Additional subsystems that are active : > >> - haptic motor > > Haptic motor is not a LED. It should be controlled by input subsystem. > >> + pwmleds { >> + compatible = "pwm-leds"; >> + >> + haptic { >> + label = "librem5::haptic"; >> + pwms = <&pwm2 0 200000>; >> + active-low; >> + max-brightness = <255>; >> + power-supply = <®_3v3_p>; >> + }; >> + }; > > You can take a look at N900, that has reasonable interface. >
I wanted to control the haptic with the pwm-vibra driver but "fsl,imx27-pwm" doesn't seem to respect the PWM_POLARITY_INVERTED flag so when I start the system the vibrator is full on.
I could use gpio-vibrator but that seemed like a waste when the device is connected to pwm.
I figured the using the pwm-leds interface was a reasonable compromise until I had an opportunity to make changes the the imx27-pwm driver.
Thanks Angus
> Thanks, > Pavel
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