linux-kernel - Re: [PATCH v2 1/2] pinctrl: bcm: bcm2835: Switch to use ->add_pin

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Date:   Sat, 14 Jan 2023 15:02:18 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Stefan Wahren <stefan.wahren@...e.com>
Cc:     Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>
Subject: Re: [PATCH v2 1/2] pinctrl: bcm: bcm2835: Switch to use
 ->add_pin_ranges()

On Sat, Jan 14, 2023 at 12:23:49PM +0100, Stefan Wahren wrote:
> Am 13.01.23 um 22:31 schrieb Andy Shevchenko:
> > On Fri, Jan 13, 2023 at 09:13:23PM +0100, Stefan Wahren wrote:
> > > Am 13.01.23 um 18:10 schrieb Andy Shevchenko:

...

> > > > Also I would like to understand the dance around checking for pin
> > > > control device. The original commit lacks of comments in the non-trivial
> > > > code.
> > Any comment on this?
> Do you mean the NULL check? of_pinctrl_get() could return NULL, but
> pinctrl_dev_get_devname() directly access the dev member.

The of_pinctrl_get() call. Why do we need that? AFAIU the code is called
after we call devm_pinctrl_register() and hence it can not be NULL. Am I
mistaken?

P.S. This is out of the scope of the series anyway, I left that untouched.
So it is just for me to understand better the code flow.

-- 
With Best Regards,
Andy Shevchenko