linux-kernel - Re: [PATCH] gpio: pca953x: Add Maxim MAX7313 PWM support

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Message-ID: <20191105100157.2b6eb22b@xps13>
Date:   Tue, 5 Nov 2019 10:01:57 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-pwm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH] gpio: pca953x: Add Maxim MAX7313 PWM support

Hi Uwe,

Andy Shevchenko <andy.shevchenko@...il.com> wrote on Tue, 5 Nov 2019
09:06:37 +0200:

> On Mon, Nov 4, 2019 at 10:33 PM Uwe Kleine-König
> <u.kleine-koenig@...gutronix.de> wrote:
> > On Mon, Nov 04, 2019 at 04:32:23PM +0100, Bartosz Golaszewski wrote:  
> > > pon., 4 lis 2019 o 16:11 Miquel Raynal <miquel.raynal@...tlin.com> napisał(a):  
> > > > Andy Shevchenko <andy.shevchenko@...il.com> wrote on Tue, 15 Oct 2019
> > > > 17:55:33 +0300:
> > > >  
> > > > > Or other way around. PWM registers GPIO (which actually I prefer since
> > > > > we have PCA9685 case where PWM provides GPIO functionality, though via
> > > > > different means)  
> 
> > While it's not nice to have a driver that provides two different devices
> > (here: gpio controller and pwm controller) similar things are not
> > unseen. And for example the splitting of watchdog
> > (drivers/watchdog/stmp3xxx_rtc_wdt.c) and rtc
> > (drivers/rtc/rtc-stmp3xxx.c) of the device in the mx28 is more trouble
> > than worth.
> >
> > So I'd vote for putting it in a single file that lives where the
> > bigger/more complex part fits to. So assuming that's the GPIO part (as
> > the driver supports several variants and not all of them have a PWM
> > function if I'm not mistaken) having it in drivers/gpio is fine for me.  
> 
> For me it sounds more likely that PWM is a *pin function* of a pin
> controller and actually this GPIO driver should be a pin controller
> with corresponding function(s).
> 

Ok, thanks for the input, I will address Thierry's comments and
re-submit as a single file (same shape as in v1).

Kind regards,
Miquèl