pinctrl: berlin: add the BG2 pinctrl driver

Add the pin-controller driver for the Berlin BG2 SoC, with definition
of its groups and functions. Pin control registers are part of chip/
system control registers, which will be represented by a single node.
Until a proper driver for the chip/system control is available,
register the corresponding regmap in pinctrl driver probe.

Signed-off-by: Antoine Tenart <antoine.tenart@free-electrons.com>
Acked-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/berlin/Kconfig b/drivers/pinctrl/berlin/Kconfig
index 3579244..381f463 100644
--- a/drivers/pinctrl/berlin/Kconfig
+++ b/drivers/pinctrl/berlin/Kconfig
@@ -5,6 +5,10 @@
 	select PINMUX
 	select REGMAP_MMIO
 
+config PINCTRL_BERLIN_BG2
+	bool
+	select PINCTRL_BERLIN
+
 config PINCTRL_BERLIN_BG2Q
 	bool
 	select PINCTRL_BERLIN