Re: [PATCH v3] pinctrl: cherryview: Add support for GMMR GPIO opregion

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Thu, Mar 23, 2017 at 2:23 PM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:

> On some Cherry Trail devices the ASL uses the GMMR GPIO to access
> GPIOs so as to serialize MMIO accesses to GPIO registers with the
> OS, because:
>
> "Due to a silicon issue, a shared lock must be used to prevent concurrent
> accesses across the 4 GPIO controllers.
>
> See Intel Atom Z8000 Processor Series Specification Update (Rev. 005),
> errata #CHT34, for further information."
>
> This commit adds support for this opregion, this fixes a number of
> ASL errors on my Ezpad mini3 tablet and makes the otg port device/host
> muxing which is controlled in firmware on this model work properly.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
> Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> ---
> Changes in v2:
> -Call acpi_remove_address_space_handler on remove
> Changes in v3:
> -Return actual status from the handler rather then always returning AE_OK

Patch applied.

Yours,
Linus Walleij
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