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Commit 31bda09d authored by Chris Brand's avatar Chris Brand Committed by Florian Fainelli
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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: default avatarChris Brand <chris.brand@broadcom.com>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent 5f79985d
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Broadcom Kona Family CPU Enable Method
--------------------------------------
This binding defines the enable method used for starting secondary
CPUs in the following Broadcom SoCs:
  BCM23550

The enable method is specified by defining the following required
properties in the "cpu" device tree node:
  - enable-method = "brcm,bcm23550";
  - secondary-boot-reg = <...>;

The secondary-boot-reg property is a u32 value that specifies the
physical address of the register used to request the ROM holding pen
code release a secondary CPU.  The value written to the register is
formed by encoding the target CPU id into the low bits of the
physical start address it should jump to.

Example:
	cpus {
		#address-cells = <1>;
		#size-cells = <0>;

		cpu0: cpu@0 {
			device_type = "cpu";
			compatible = "arm,cortex-a9";
			reg = <0>;
		};

		cpu1: cpu@1 {
			device_type = "cpu";
			compatible = "arm,cortex-a9";
			reg = <1>;
			enable-method = "brcm,bcm23550";
			secondary-boot-reg = <0x3500417c>;
		};
	};
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Broadcom BCM23550 device tree bindings
--------------------------------------

This document describes the device tree bindings for boards with the BCM23550
SoC.

Required root node property:
  - compatible: brcm,bcm23550

Example:
	/ {
		model = "BCM23550 SoC";
		compatible = "brcm,bcm23550";
		[...]
	}
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@@ -194,6 +194,7 @@ nodes to be present and contain the properties described below.
			    "allwinner,sun8i-a23"
			    "arm,realview-smp"
			    "brcm,bcm11351-cpu-method"
			    "brcm,bcm23550"
			    "brcm,bcm-nsp-smp"
			    "brcm,brahma-b15"
			    "marvell,armada-375-smp"