linux-kernel - Re: [PATCH 1/3] ARM/gpio: Push OMAP2 quirk down into TWL4030 driver

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Message-ID: <CAMRc=MczGKVFo+iWe_Pnvi3-hCK0fhmmkjp-h92RHONEHFAP_g@mail.gmail.com>
Date:   Wed, 3 May 2023 15:01:46 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Lee Jones <lee@...nel.org>,
        Andreas Kemnade <andreas@...nade.info>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 1/3] ARM/gpio: Push OMAP2 quirk down into TWL4030 driver

On Mon, May 1, 2023 at 11:05 AM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> The TWL4030 GPIO driver has a custom platform data .set_up()
> callback to call back into the platform and do misc stuff such
> as hog and export a GPIO for WLAN PWR on a specific OMAP3 board.
>
> Avoid all the kludgery in the platform data and the boardfile
> and just put the quirks right into the driver. Make it
> conditional on OMAP3.
>
> I think the exported GPIO is used by some kind of userspace
> so ordinary DTS hogs will probably not work.
>

While I haven't tested it (nor can I) so don't take my word for it, it
looks to me as if regular DTS hogs *should* work. If anything, the way
this quirk is implemented in your patch moves the export past the chip
registration, while ordinary hogs would be applied when the chip is
first added.

Am I missing something?

Bart

[snip]