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

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Message-ID:
 <ZQ0PR01MB1253BF74E45489EDBA1A8DB19FB82@ZQ0PR01MB1253.CHNPR01.prod.partner.outlook.cn>
Date: Wed, 7 Aug 2024 07:29:32 +0000
From: William Qiu <william.qiu@...rfivetech.com>
To: Uwe Kleine-König <u.kleine-koenig@...libre.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>, Hal Feng
	<hal.feng@...rfivetech.com>, Philipp Zabel <p.zabel@...gutronix.de>
Subject: RE: [PATCH v13] pwm: opencores: Add PWM driver support



> -----Original Message-----
> From: Uwe Kleine-König <u.kleine-koenig@...libre.com>
> Sent: 2024年8月7日 13:57
> To: William Qiu <william.qiu@...rfivetech.com>
> Cc: linux-kernel@...r.kernel.org; linux-pwm@...r.kernel.org; Hal Feng
> <hal.feng@...rfivetech.com>; Philipp Zabel <p.zabel@...gutronix.de>
> 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@...libre.com> [...] 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