Re: [PATCH v2 0/3] gpio/pinctrl: imx: let IOMUX controller know about on-SoC GPIOs

[Shawn Guo <shawnguo@kernel.org>]

On Thu, Sep 08, 2016 at 04:48:13AM +0300, Vladimir Zapolskiy wrote:
> The change establishes a connection between on-SoC IOMUX controller(s)
> and GPIO controllers found on some SoC from Freescale/NXP iMX series,
> if a GPIO controller device node contains common gpio-ranges information.
> 
> The change is backward compatible with respect to potentially not updated
> outdated DTB data without gpio-ranges propery, for such boards the only
> functional change is lowered initcall priority of GPIO controller driver,
> which in general anyway is exected to be used only after pinctrl/pinmux
> controller.
> 
> If this change is applied the next interesting applications may be done
> as a follow-up work, for example switching pad function to GPIO on gpiod
> request, converting iomux controller driver to strict type and so on.
> 
> For actual values of gpio-ranges properties please reference series
> "ARM: dts: imx: add gpio-ranges properties to some iMX GPIO controllers"
> http://www.spinics.net/lists/arm-kernel/msg525258.html
> 
> Changes from v1 to v2:
> * replaced 2/3 by an own change providing a better commit description
>   and which moves gpio_mxc_init() call to subsys_initcall() instead of
>   apparently too late device_initcall(), this mitigates Shawn's
>   expressed concern about the change.

Yes, this is more conservative and stands less chance to cause regression.

> 
> Vladimir Zapolskiy (3):
>   pinctrl: imx: accept gpio request/free from pinctrl
>   gpio: mxc: shift gpio_mxc_init() to subsys_initcall level
>   gpio: mxc: add generic gpio request/free callbacks to pinctrl

For the series,

Acked-by: Shawn Guo <shawnguo@kernel.org>