[PATCH v2 3/6] docs: Document BCM23550 bindings
From: Chris Brand <hidden>
Date: 2016-05-11 21:35:43
Also in:
linux-devicetree, linux-pm, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted> --- .../bindings/arm/bcm/brcm,bcm23550-cpu-method.txt | 36 ++++++++++++++++++++++ .../devicetree/bindings/arm/bcm/brcm,bcm23550.txt | 15 +++++++++ Documentation/devicetree/bindings/arm/cpus.txt | 1 + 3 files changed, 52 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550-cpu-method.txt create mode 100644 Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550.txt
diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550-cpu-method.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550-cpu-method.txt
new file mode 100644
index 000000000000..a3af54c0e404
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550-cpu-method.txt@@ -0,0 +1,36 @@ +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 at 0 { + device_type = "cpu"; + compatible = "arm,cortex-a9"; + reg = <0>; + }; + + cpu1: cpu at 1 { + device_type = "cpu"; + compatible = "arm,cortex-a9"; + reg = <1>; + enable-method = "brcm,bcm23550"; + secondary-boot-reg = <0x3500417c>; + }; + };
diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550.txt
new file mode 100644
index 000000000000..080baad923d6
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcm23550.txt@@ -0,0 +1,15 @@ +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"; + [...] + }
diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
index ccc62f145306..37765e76db71 100644
--- a/Documentation/devicetree/bindings/arm/cpus.txt
+++ b/Documentation/devicetree/bindings/arm/cpus.txt@@ -194,6 +194,7 @@ nodes to be present and contain the properties described below. "allwinner,sun8i-a23" "arm,psci" "arm,realview-smp" + "brcm,bcm23550" "brcm,bcm-nsp-smp" "brcm,brahma-b15" "marvell,armada-375-smp"
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1.9.1