On Thu, 6 Dec 2018 13:41:30 +0000, =?utf-8?B?Vm9rw6HEjSBNaWNoYWw=?= wrote: > Output of the PWM block on i.MX SoCs is always low when the block is > disabled. This can cause issues when inverted PWM polarity is needed. > With inverted polarity a duty cycle = 0% corresponds to high level on > the output. Now, when PWM is disabled its output instantly goes low > which corresponds to duty cycle = 100%. > > To get a truly inverted PWM output two pinctrl states of the PWM pin > can be used. Configure the pin to GPIO function when PWM is disabled > and switch back to PWM function whenever non-zero duty cycle is needed. > > Signed-off-by: Michal Vokáč <michal.vokac@xxxxxxxxx> > --- > Changes in v3: > - Slightly different description of the pinctrl and pwm-gpio. > > Changes in v2: > - Do not use the "default" pinctrl state for GPIO. > - Use two new "pwm" and "gpio" pinctrl states. > - Add a new pwm-gpios signal. > > Documentation/devicetree/bindings/pwm/imx-pwm.txt | 49 +++++++++++++++++++++++ > 1 file changed, 49 insertions(+) > Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
