On Wed, Dec 16, 2015 at 03:55:13PM -0800, Eric Anholt wrote:
> The Pi 2 B ends up like a Pi 1 B+, with the same peripherals and
> pinout, but the CPU and memory layout changed to use the 2836.
>
> Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
> ---
> arch/arm/boot/dts/bcm2836-rpi-2-b.dts | 35 ++++++++++++++++
> arch/arm/boot/dts/bcm2836.dtsi | 77 +++++++++++++++++++++++++++++++++++
> 2 files changed, 112 insertions(+)
> create mode 100644 arch/arm/boot/dts/bcm2836-rpi-2-b.dts
> create mode 100644 arch/arm/boot/dts/bcm2836.dtsi
>
> diff --git a/arch/arm/boot/dts/bcm2836-rpi-2-b.dts b/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
> new file mode 100644
> index 0000000..ff94666
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
> @@ -0,0 +1,35 @@
> +/dts-v1/;
> +#include "bcm2836.dtsi"
> +#include "bcm2835-rpi.dtsi"
> +
> +/ {
> + compatible = "raspberrypi,2-model-b", "brcm,bcm2836";
> + model = "Raspberry Pi 2 Model B";
> +
> + memory {
> + reg = <0 0x40000000>;
> + };
> +
> + leds {
> + act {
> + gpios = <&gpio 47 0>;
> + };
> +
> + pwr {
> + label = "PWR";
> + gpios = <&gpio 35 0>;
> + default-state = "keep";
> + linux,default-trigger = "default-on";
> + };
> + };
> +};
> +
> +&gpio {
> + pinctrl-0 = <&gpioout &alt0 &i2s_alt0 &alt3>;
> +
> + /* I2S interface */
> + i2s_alt0: i2s_alt0 {
> + brcm,pins = <18 19 20 21>;
> + brcm,function = <BCM2835_FSEL_ALT0>;
> + };
> +};
> diff --git a/arch/arm/boot/dts/bcm2836.dtsi b/arch/arm/boot/dts/bcm2836.dtsi
> new file mode 100644
> index 0000000..6693118
> --- /dev/null
> +++ b/arch/arm/boot/dts/bcm2836.dtsi
> @@ -0,0 +1,77 @@
> +#include "bcm283x.dtsi"
> +
> +/ {
> + compatible = "brcm,bcm2836";
> +
> + soc {
> + ranges = <0x7e000000 0x3f000000 0x1000000>,
nitpik, I would change it here to 0x01000000 for the size parameter,
like below: 8-byte filled with zeroes.
> + <0x40000000 0x40000000 0x00001000>;
Is 0x00001000 correct here? I currently debug this part because the
devicetree issues which I mentioned. I looked into some bcm2836
datasheet. See [0], section "4 Registers", I assume this should be 0x00000100.
Or are there more than these registers which need to be accessable?
- Alex
[0] https://github.com/raspberrypi/documentation/blob/master/hardware/raspberrypi/bcm2836/QA7_rev3.4.pdf
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