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Document the bindings that the Broadcom STB platform needs for proper bootup. Signed-off-by: Marc Carino <marc.ceeeee@gmail.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Matt Porter <mporter@linaro.org>
96 lines
2.7 KiB
Plaintext
96 lines
2.7 KiB
Plaintext
ARM Broadcom STB platforms Device Tree Bindings
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-----------------------------------------------
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Boards with Broadcom Brahma15 ARM-based BCMxxxx (generally BCM7xxx variants)
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SoC shall have the following DT organization:
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Required root node properties:
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- compatible: "brcm,bcm<chip_id>", "brcm,brcmstb"
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example:
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/ {
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#address-cells = <2>;
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#size-cells = <2>;
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model = "Broadcom STB (bcm7445)";
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compatible = "brcm,bcm7445", "brcm,brcmstb";
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Further, syscon nodes that map platform-specific registers used for general
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system control is required:
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- compatible: "brcm,bcm<chip_id>-sun-top-ctrl", "syscon"
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- compatible: "brcm,bcm<chip_id>-hif-cpubiuctrl", "syscon"
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- compatible: "brcm,bcm<chip_id>-hif-continuation", "syscon"
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example:
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rdb {
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#address-cells = <1>;
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#size-cells = <1>;
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compatible = "simple-bus";
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ranges = <0 0x00 0xf0000000 0x1000000>;
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sun_top_ctrl: syscon@404000 {
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compatible = "brcm,bcm7445-sun-top-ctrl", "syscon";
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reg = <0x404000 0x51c>;
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};
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hif_cpubiuctrl: syscon@3e2400 {
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compatible = "brcm,bcm7445-hif-cpubiuctrl", "syscon";
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reg = <0x3e2400 0x5b4>;
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};
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hif_continuation: syscon@452000 {
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compatible = "brcm,bcm7445-hif-continuation", "syscon";
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reg = <0x452000 0x100>;
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};
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};
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Lastly, nodes that allow for support of SMP initialization and reboot are
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required:
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smpboot
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-------
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Required properties:
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- compatible
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The string "brcm,brcmstb-smpboot".
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- syscon-cpu
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A phandle / integer array property which lets the BSP know the location
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of certain CPU power-on registers.
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The layout of the property is as follows:
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o a phandle to the "hif_cpubiuctrl" syscon node
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o offset to the base CPU power zone register
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o offset to the base CPU reset register
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- syscon-cont
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A phandle pointing to the syscon node which describes the CPU boot
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continuation registers.
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o a phandle to the "hif_continuation" syscon node
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example:
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smpboot {
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compatible = "brcm,brcmstb-smpboot";
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syscon-cpu = <&hif_cpubiuctrl 0x88 0x178>;
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syscon-cont = <&hif_continuation>;
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};
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reboot
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-------
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Required properties
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- compatible
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The string property "brcm,brcmstb-reboot".
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- syscon
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A phandle / integer array that points to the syscon node which describes
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the general system reset registers.
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o a phandle to "sun_top_ctrl"
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o offset to the "reset source enable" register
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o offset to the "software master reset" register
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example:
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reboot {
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compatible = "brcm,brcmstb-reboot";
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syscon = <&sun_top_ctrl 0x304 0x308>;
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};
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