linux-kernel - Re: [PATCH v2 1/1] pwm: mediatek: add longer period support

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Date:   Mon, 9 Mar 2020 11:35:41 +0800
From:   Sam Shih <sam.shih@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        "Uwe Kleine-König" 
        <u.kleine-koenig@...gutronix.de>
CC:     <linux-pwm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        <linux-mediatek@...ts.infradead.org>,
        "John Crispin" <john@...ozen.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/1] pwm: mediatek: add longer period support

Hello,

On Sun, 2020-03-08 at 21:18 +0100, Uwe Kleine-König wrote:
> Hello,
> 
> On Sat, Mar 07, 2020 at 10:28:36PM +0100, Matthias Brugger wrote:
> > On 03/03/2020 11:19, Sam Shih wrote:
> > > The pwm clock source could be divided by 1625 with PWM_CON
> > > BIT(3) setting in mediatek hardware.
> > > 
> > > This patch add support for longer pwm period configuration,
> > > which allowing blinking LEDs via pwm interface.
> > 
> > Is this a fix? In this case please provide a Fixes tag with the commit ID which
> > introduced the bug.
> 
> I'd say it qualifies as a fix if without it a request with a long period
> returns success but isn't properly implemented. Otherwise it's only a
> new feature.
> 

It's only a new feature.

Without this patch, pwm_mediatek_config return -EINVAL when receive a
long period request.

I will send v3 to reply Uwe's comment.


Best Regards,
Sam Shih