pinctrl: rockchip: separate different sub-types more

Further investigation of the different Rockchip SoCs showed that
the differences especially in the pull settings are quite deep.
As further patches will show, the register layout for the pulls of
the rk3188 is quite strange. Also it is to assume, that later
Rockchip SoCs may introduce even more quirks in this regard, making
it hard to support all of those using the current generic pull_*
variables.

Therefore move the driver to hold the type of controller in an enum
and do the handling according to it in the necessary places. Also
instead of calculating the register in the get and set pull functions
move it to a type-specific callback.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
pinctrl: rockchip: add support for multiple bank types

There are Rockchip SoCs, namely the rk3188, that combine a set of
regular banks with banks that need special handling for some settings.

Therefore add the possibility for the driver to handle more than one
bank type.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
pinctrl: rockchip: remove redundant check

The check limiting bias options to supported ones is already
done thru rockchip_pinconf_pull_valid. Therefore this check is
redundant and can be removed.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
pinctrl: rockchip: add rk3188 specifics

Besides the pull registers sitting in a separate place, the rk3188 also
has the peculiarity that the pull registers of the first bank are split
and the first half is sitting in the register space of the pmu.

Therefore this adds a special bank-type for the first bank, to handle
the two register sources.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
pinctrl: rockchip: emulate both edge triggered interrupts

The gpio interrupt controller on Rockchip socs can do edge triggers only
for single edges but not both. Nevertheless a lot of gpio users rely on
the availability of both-edge triggered interrupts - i.e. gpio-keys.

Therefore implement a solution similar to pinctrl-coh901 re-setting the
triggering edge depending on the gpio value in the interrupt demuxer.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Merge branch 'wip/pinctrl-rk3188' into topgit/devel
Merge branch 'topgit/devel' of github.com:mmind/linux-rockchip into topgit/devel