ARM: bcm2835: enable GPIO/pinctrl

Enable GPIO and pinctrl in Kconfig.

Add required <mach/gpio.h> for gpiolib.

Instantiate the BCM2835 GPIO module in bcm2835.dtsi.

Add a pinctrl definition to bcm2835-rpi-b.dts that sets up all of the
board's required pinmux configuration. GPIO aren't specified; that's
left to gpio_request().

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 5c5cbafed191..8917550fd1bb 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -40,5 +40,28 @@
 			interrupts = <2 25>;
 			clock-frequency = <3000000>;
 		};
+
+		gpio: gpio {
+			compatible = "brcm,bcm2835-gpio";
+			reg = <0x7e200000 0xb4>;
+			/*
+			 * The GPIO IP block is designed for 3 banks of GPIOs.
+			 * Each bank has a GPIO interrupt for itself.
+			 * There is an overall "any bank" interrupt.
+			 * In order, these are GIC interrupts 17, 18, 19, 20.
+			 * Since the BCM2835 only has 2 banks, the 2nd bank
+			 * interrupt output appears to be mirrored onto the
+			 * 3rd bank's interrupt signal.
+			 * So, a bank0 interrupt shows up on 17, 20, and
+			 * a bank1 interrupt shows up on 18, 19, 20!
+			 */
+			interrupts = <2 17>, <2 18>, <2 19>, <2 20>;
+
+			gpio-controller;
+			#gpio-cells = <2>;
+
+			interrupt-controller;
+			#interrupt-cells = <2>;
+		};
 	};
 };