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>
diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 5c5cbaf..8917550 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>;
+ };
};
};