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Documentation: devicetree: Document BCM23550 bindings
Add binding document for Broadcom BCM23550 SoC.
BCM23550 has a Cluster Dormant Control IP block that holds cores
in an idle state. Introduce a new CPU enable method in which the CDC is
accessed to bring the core online.
Signed-off-by: Chris Brand <chris.brand@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
authored by
Chris Brand
and committed by
Florian Fainelli
31bda09d
5f79985d
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Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550-cpu-method.txt
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Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550-cpu-method.txt
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Broadcom Kona Family CPU Enable Method
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--------------------------------------
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This binding defines the enable method used for starting secondary
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CPUs in the following Broadcom SoCs:
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BCM23550
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The enable method is specified by defining the following required
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properties in the "cpu" device tree node:
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- enable-method = "brcm,bcm23550";
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- secondary-boot-reg = <...>;
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The secondary-boot-reg property is a u32 value that specifies the
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physical address of the register used to request the ROM holding pen
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code release a secondary CPU. The value written to the register is
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formed by encoding the target CPU id into the low bits of the
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physical start address it should jump to.
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Example:
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cpus {
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#address-cells = <1>;
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#size-cells = <0>;
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cpu0: cpu@0 {
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device_type = "cpu";
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compatible = "arm,cortex-a9";
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reg = <0>;
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};
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cpu1: cpu@1 {
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device_type = "cpu";
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compatible = "arm,cortex-a9";
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reg = <1>;
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enable-method = "brcm,bcm23550";
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secondary-boot-reg = <0x3500417c>;
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};
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};
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Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550.txt
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Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550.txt
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Broadcom BCM23550 device tree bindings
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--------------------------------------
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This document describes the device tree bindings for boards with the BCM23550
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SoC.
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Required root node property:
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- compatible: brcm,bcm23550
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Example:
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/ {
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model = "BCM23550 SoC";
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compatible = "brcm,bcm23550";
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[...]
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}