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Subject[PATCHv4 0/4] pwm: imx: support output polarity inversion
This patch series adds support for polarity inversion to the pwm-imx
driver. The patches have been tested on i.MX6, i.MX53 and with the
ti-ehrpwm.c driver.

Changes wrt. v2:
- make the use of '#pwm-cells = <3>' optional, so that the change does
not break existing DT blobs as suggested by Arnd Bergmann and Sascha

Changes wrt. v3:
- implemented the approach suggested by Sascha Hauer
- don't modify struct pwm_ops in the imx_pwm probe function

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