ARM: bcm2835: add USB controller to device tree

The BCM2835 SoC contains a DWC2 USB controller. Add this to the DT.

Set up the pin controller to fully enable the USB controller on the
Raspberry Pi. The GPIO setup works because the default output value for
GPIO 6 (LAN_RUN/n_reset) just happens to be 1, which enables the
USB/LAN chip.

Note that you'll need a U-Boot which enables power to the USB controller;
search for U-Boot patch "ARM: rpi_b: power on SDHCI and USB HW modules".

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

diff --git a/arch/arm/boot/dts/bcm2835-rpi-b.dts b/arch/arm/boot/dts/bcm2835-rpi-b.dts
index 6e9deb786a7d1e4d6a19ee5a1613da8dde882bc0..2a3b1c1313a0c474bed0c681fea43029ba8fe20d 100644 (file)
--- a/arch/arm/boot/dts/bcm2835-rpi-b.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b.dts
@@ -23,10 +23,15 @@
 
 &gpio {
        pinctrl-names = "default";
-       pinctrl-0 = <&alt0 &alt3>;
+       pinctrl-0 = <&gpioout &alt0 &alt3>;
+
+       gpioout: gpioout {
+               brcm,pins = <6>;
+               brcm,function = <1>; /* GPIO out */
+       };
 
        alt0: alt0 {
-               brcm,pins = <0 1 2 3 4 5 6 7 8 9 10 11 14 15 40 45>;
+               brcm,pins = <0 1 2 3 4 5 7 8 9 10 11 14 15 40 45>;
                brcm,function = <4>; /* alt0 */
        };
 

diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 1e12aeff403b018cf174ff1b710af391f970c997..71a78f794dfacb8b56cdcc52016a0b89829d323c 100644 (file)
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -103,6 +103,12 @@
                        clocks = <&clk_mmc>;
                        status = "disabled";
                };
+
+               usb {
+                       compatible = "brcm,bcm2835-usb";
+                       reg = <0x7e980000 0x10000>;
+                       interrupts = <1 9>;
+               };
        };
 
        clocks {