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ARM: bcm2835: add USB controller to device tree

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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>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Stephen Warren 2013-12-26 19:43:10 -07:00 committed by Olof Johansson
parent c53cb8d6a2
commit 5631e7f4e2
2 changed files with 13 additions and 2 deletions
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9
arch/arm/boot/dts/bcm2835-rpi-b.dts
View File

@ -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 */
};

6
arch/arm/boot/dts/bcm2835.dtsi
View File

@ -107,6 +107,12 @@
clocks = <&clk_mmc>;
status = "disabled";
};
usb {
compatible = "brcm,bcm2835-usb";
reg = <0x7e980000 0x10000>;
interrupts = <1 9>;
};
};
clocks {