Re: [RFC PATCH v2 04/12] mtd: rawnand: ams-delta: request data port GPIO resource

From: Linus Walleij
Date: Fri Aug 10 2018 - 06:11:34 EST

On Tue, Aug 7, 2018 at 12:29 AM Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx> wrote:

> Data port used by the driver is actually an OMAP MPUIO device, already
> under control of gpio-omap driver. For that reason we used to not
> request the memory region of the port as that would fail because the
> region is already busy. Despite that, we are still accessing the port
> by just ioremapping it and performing read/write operations. Moreover,
> we are doing that without any proteciton from other users legally
> manipulating the port pins over GPIO API.
> The plan is to convert the driver to access the port over functions
> exposed by the gpio-omap driver. Before that happens, already prevent
> from other users accessing the port pins by requesting an array of its
> GPIO descriptors.
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx>

Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

Linus Walleij