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

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Message-ID: <CAHp75Vc4vnNVKc+Q_TY8DpwV4rLZYGm2MvGBC7r67XjmtNoskQ@mail.gmail.com>
Date:   Mon, 14 Oct 2019 20:59:01 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        "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>
Subject: Re: [PATCH] gpio: pca953x: Add Maxim MAX7313 PWM support

On Mon, Oct 14, 2019 at 4:09 PM Miquel Raynal <miquel.raynal@...tlin.com> wrote:
>
> 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.

Can we rather not contaminate driver with this?

Just register a separate PWM driver and export its functionality to
GPIO, or other way around (in the latter case we actually have PCA8685
which provides a GPIO fgunctionality).

-- 
With Best Regards,
Andy Shevchenko