Re: [PATCH 0/1] pwm: meson: fix scheduling while atomic issue

From: Uwe Kleine-König
Date: Mon Mar 25 2019 - 04:50:47 EST


On Mon, Mar 25, 2019 at 09:41:53AM +0100, Uwe Kleine-König wrote:
> If you want to implement further cleanups, my questions and propositions
> are:
> - Is there a publicly available manual for this hardware? If yes, you
> can add a link to it in the header of the driver.
> - Why do you handle reparenting of the PWM's clk in .request? Wouldn't
> this be more suitable in .apply?
> - Does stopping the PWM (i.e. clearing MISC_{A,B}_EN in the MISC_AB
> register) freeze the output, or is the currently running period
> completed first? (The latter is the right behaviour.)
> - Please point out in the header that for changing period/duty
> cycle/polarity the hardware must be stopped. (I suggest to apply the
> style used in
> for some consistency.)

Another thing I just noted: The .get_state callback only sets .enabled
but nothing of the remaining information is provided.

Best regards

Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | |