arm: vt8500: gpio: Devicetree support for arch-vt8500

Converted the existing arch-vt8500 gpio to a platform_device.
Added support for WM8505 and WM8650 GPIO controllers.
Replaced existing readl/writel calls with _relaxed variants.
Replaced existing unsigned variables with u32 to match register size.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ba7926f5c099..a00b828b1643 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -183,6 +183,12 @@ config GPIO_STA2X11
           Say yes here to support the STA2x11/ConneXt GPIO device.
           The GPIO module has 128 GPIO pins with alternate functions.
 
+config GPIO_VT8500
+        bool "VIA/Wondermedia SoC GPIO Support"
+        depends on ARCH_VT8500
+        help
+          Say yes here to support the VT8500/WM8505/WM8650 GPIO controller.
+
 config GPIO_XILINX
         bool "Xilinx GPIO support"
         depends on PPC_OF || MICROBLAZE