Commit 31bda09d authored by Chris Brand's avatar Chris Brand Committed by Florian Fainelli

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