linux-kernel - Re: [PATCH v6] gpio: pca953x: Add Maxim MAX7313 PWM support

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Message-ID: <20200630090806.6bgjgi34gtcrzfze@pengutronix.de>
Date:   Tue, 30 Jun 2020 11:08:06 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-gpio@...r.kernel.org, linux-pwm@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6] gpio: pca953x: Add Maxim MAX7313 PWM support

Hello Miquel,

On Tue, Jun 30, 2020 at 08:58:28AM +0200, Miquel Raynal wrote:
> Uwe Kleine-König <u.kleine-koenig@...gutronix.de> wrote on Mon, 29 Jun
> 2020 21:50:44 +0200:
> 
> > On Mon, Jun 29, 2020 at 04:08:44PM +0200, Miquel Raynal wrote:
> > > Hello Uwe, Thierry,
> > > 
> > > Miquel Raynal <miquel.raynal@...tlin.com> wrote on Sun,  3 May 2020
> > > 12:54:53 +0200:
> > >   
> > > > The MAX7313 chip is fully compatible with the PCA9535 on its basic
> > > > functions but can also manage the intensity on each of its ports with
> > > > PWM. Each output is independent and may be tuned with 16 values (4
> > > > bits per output). The period is always 32kHz, only the duty-cycle may
> > > > be changed. One can use any output as GPIO or PWM.
> > > > 
> > > > Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> > > > ---  
> > > 
> > > Can I have a status on this patch please?
> > > 
> > > If it was forgotten, I would be good to have it queued now, otherwise,
> > > may I know the reason?  
> > 
> > You could reply to my feedback ... If you could say there: "What you
> > want isn't possible" I'd count this as a strong indication to not ask to
> > implement Andy's suggestion. (Even if this would be possible, I'm not
> > sure this is a good idea, but still ...)
> 
> Sorry for the misunderstanding, but I already replied twice to Andy
> about this. Once in October, again in November, then I gave a shot to
> the idea of splitting the drivers (GPIO vs. PWM) in January. So I
> thought you were sharing your thoughts out loud but was not expecting
> any specific feedback on it.

Ah ok. Probably the discussion took too long already and was swapped out
on my end.

I will take a look once more later this week. One thing I noticed while
skimming the patch was, that the added defines could make use of a nice
prefix. MAX_PWM for example sounds quite generic.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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