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    SubjectRe: [PATCH v1 1/5] ARM: imx28: add basic dt support
    Date
    On Tue, 13 Mar 2012 16:47:04 +0800, Dong Aisheng <b29396@freescale.com> wrote:
    > From: Dong Aisheng <dong.aisheng@linaro.org>
    >
    > This patch includes basic dt support which can boot via nfs rootfs.
    >
    > Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
    > ---
    > Documentation/devicetree/bindings/arm/fsl.txt | 4 +
    > arch/arm/boot/dts/imx28-evk.dts | 31 +++++++++
    > arch/arm/boot/dts/imx28.dtsi | 88 +++++++++++++++++++++++++
    > arch/arm/mach-mxs/Kconfig | 9 +++
    > arch/arm/mach-mxs/Makefile | 1 +
    > arch/arm/mach-mxs/imx28-dt.c | 67 +++++++++++++++++++
    > 6 files changed, 200 insertions(+), 0 deletions(-)
    >
    > diff --git a/Documentation/devicetree/bindings/arm/fsl.txt b/Documentation/devicetree/bindings/arm/fsl.txt
    > index 54bddda..9f21faf 100644
    > --- a/Documentation/devicetree/bindings/arm/fsl.txt
    > +++ b/Documentation/devicetree/bindings/arm/fsl.txt
    > @@ -1,6 +1,10 @@
    > Freescale i.MX Platforms Device Tree Bindings
    > -----------------------------------------------
    >
    > +i.MX28 Evaluation Kit
    > +Required root node properties:
    > + - compatible = "fsl,imx28-evk", "fsl,imx28";
    > +
    > i.MX51 Babbage Board
    > Required root node properties:
    > - compatible = "fsl,imx51-babbage", "fsl,imx51";
    > diff --git a/arch/arm/boot/dts/imx28-evk.dts b/arch/arm/boot/dts/imx28-evk.dts
    > new file mode 100644
    > index 0000000..9758dc4
    > --- /dev/null
    > +++ b/arch/arm/boot/dts/imx28-evk.dts
    > @@ -0,0 +1,31 @@
    > +/*
    > + * Copyright 2012 Freescale Semiconductor, Inc.
    > + *
    > + * The code contained herein is licensed under the GNU General Public
    > + * License. You may obtain a copy of the GNU General Public License
    > + * Version 2 or later at the following locations:
    > + *
    > + * http://www.opensource.org/licenses/gpl-license.html
    > + * http://www.gnu.org/copyleft/gpl.html
    > + */
    > +
    > +/dts-v1/;
    > +/include/ "imx28.dtsi"
    > +
    > +/ {
    > + model = "Freescale i.MX28 Evaluation Kit";
    > + compatible = "fsl,imx28-evk", "fsl,imx28";
    > +
    > + memory {
    > + device_type = "memory";
    > + reg = <0x40000000 0x08000000>;
    > + };
    > +
    > + ahb@80080000 {
    > + fec@800f0000 {
    > + phy-mode = "rmii";
    > + local-mac-address = [00 04 9F 01 7D 5B];

    Generally a bad idea to put a specific mac address into the device tree.
    Better to fill it with zeros. Otherwise all the dev boards will end up using
    the same value.

    > + status = "okay";
    > + };
    > + };
    > +};
    > diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
    > new file mode 100644
    > index 0000000..acf0dab
    > --- /dev/null
    > +++ b/arch/arm/boot/dts/imx28.dtsi
    > @@ -0,0 +1,88 @@
    > +/*
    > + * Copyright 2012 Freescale Semiconductor, Inc.
    > + *
    > + * The code contained herein is licensed under the GNU General Public
    > + * License. You may obtain a copy of the GNU General Public License
    > + * Version 2 or later at the following locations:
    > + *
    > + * http://www.opensource.org/licenses/gpl-license.html
    > + * http://www.gnu.org/copyleft/gpl.html
    > + */
    > +
    > +/include/ "skeleton.dtsi"
    > +
    > +/ {
    > + #address-cells = <1>;
    > + #size-cells = <1>;
    > + interrupt-parent = <&icoll>;
    > +
    > + aliases {
    > + serial0 = &uart1;
    > + };
    > +
    > + cpus {
    > + cpu@0 {
    > + compatible = "arm,arm926ejs";
    > + };
    > + };
    > +
    > + apb@80000000 {
    > + compatible = "simple-bus";
    > + #address-cells = <1>;
    > + #size-cells = <1>;
    > + reg = <0x80000000 0x80000>;
    > + ranges;
    > +
    > + apbh@80000000 {
    > + compatible = "simple-bus";
    > + #address-cells = <1>;
    > + #size-cells = <1>;
    > + reg = <0x80000000 0x3c900>;
    > + ranges;
    > +
    > + icoll: interrupt-controller@80000000 {
    > + compatible = "fsl,imx28-icoll";
    > + interrupt-controller;
    > + #interrupt-cells = <1>;
    > + reg = <0x80000000 0x2000>;
    > + };
    > + };
    > +
    > + apbx@80040000 {
    > + compatible = "simple-bus";
    > + #address-cells = <1>;
    > + #size-cells = <1>;
    > + reg = <0x80040000 0x40000>;
    > + ranges;
    > +
    > + uart1: uart@80074000 {
    > + compatible = "arm,pl011", "arm,primecell";
    > + reg = <0x80074000 0x2000>;
    > + interrupts = <47>;
    > + };
    > + };

    What is the purpose of the apbh and apbx busses? Will more device nodes
    get added to them later, or does each only contain a single device?

    g.


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