RE: [PATCH v13] pwm: opencores: Add PWM driver support

[William Qiu]

> -----Original Message-----
> From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx>
> Sent: 2024年8月7日 13:57
> To: William Qiu <william.qiu@xxxxxxxxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-pwm@xxxxxxxxxxxxxxx; Hal Feng
> <hal.feng@xxxxxxxxxxxxxxxx>; Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
> Subject: Re: [PATCH v13] pwm: opencores: Add PWM driver support
> 
> Hello William,
> 
> On Wed, Aug 07, 2024 at 03:41:15AM +0000, William Qiu wrote:
> > > -----Original Message-----
> > > From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxx> [...] On Tue,
> > > Jul 02, 2024 at 04:38:48PM +0800, William Qiu wrote:
> > > > + * - The hardware will have a conversion cycle when reconfiguring.
> > >
> > > I don't understand that.
> > > .
> > For example, after the PWM duty cycle is changed from 50% to 80%, it
> > is not a direct change, but there is a conversion period. The waveform
> > during the conversion period will vary depending on whether it is high
> > or low when reconfigured.
> 
> Is it "just" that the new settings become active immediately and so if you
> change the relative duty_cycle from 50% to 80% and the current period is
> "done" between 50% and 80% you get three instead of one level change during
> that period?
> 
> If it's that, I'd describe that as: When configuration changes are done, they get
> active immediately without resetting the counter. This might result in one
> period affected by both old and new settings.
> 
> Best regards
> Uwe
Fine, I'll describe just like that.

Best Regards,
William