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Date:   Wed, 29 Nov 2017 12:18:42 -0800
From:   Florian Fainelli <>
Cc:     Florian Fainelli <>,
        Rob Herring <>,
        Mark Rutland <>,
        Brian Norris <>,
        Gregory Fong <>, (open list:OPEN FIRMWARE AND FLATTENED
        ARM ARCHITECTURE), (open list)
Subject: [PATCH 2/9] dt-bindings: arm: brcmstb: Correct BIUCTRL node documentation

Correct the Device Tree bindings for the HIF_CPUBIUCTRL node whose
compatible string is actually brcm,bcm<chip-id>-cpu-biu-ctrl. Also
document in the binding the fallback property
("brcm,brcmstb-cpu-biu-ctrl") and update the example accordingly.

Signed-off-by: Florian Fainelli <>
 .../devicetree/bindings/arm/bcm/brcm,brcmstb.txt   | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt
index 790e6b0b8306..05be8d1f7be6 100644
--- a/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt
@@ -17,21 +17,23 @@ Further, syscon nodes that map platform-specific registers used for general
 system control is required:
     - compatible: "brcm,bcm<chip_id>-sun-top-ctrl", "syscon"
-    - compatible: "brcm,bcm<chip_id>-hif-cpubiuctrl", "syscon"
+    - compatible: "brcm,bcm<chip_id>-cpu-biu-ctrl",
+		  "brcm,brcmstb-cpu-biu-ctrl",
+		  "syscon"
     - compatible: "brcm,bcm<chip_id>-hif-continuation", "syscon"
-hif-cpubiuctrl node
+cpu-biu-ctrl node
-SoCs with Broadcom Brahma15 ARM-based CPUs have a specific Bus Interface Unit
-(BIU) block which controls and interfaces the CPU complex to the different
-Memory Controller Ports (MCP), one per memory controller (MEMC). This BIU block
-offers a feature called Write Pairing which consists in collapsing two adjacent
-cache lines into a single (bursted) write transaction towards the memory
-controller (MEMC) to maximize write bandwidth.
+SoCs with Broadcom Brahma15 ARM-based and Brahma53 ARM64-based CPUs have a
+specific Bus Interface Unit (BIU) block which controls and interfaces the CPU
+complex to the different Memory Controller Ports (MCP), one per memory
+controller (MEMC). This BIU block offers a feature called Write Pairing which
+consists in collapsing two adjacent cache lines into a single (bursted) write
+transaction towards the memory controller (MEMC) to maximize write bandwidth.
 Required properties:
-    - compatible: must be "brcm,bcm7445-hif-cpubiuctrl", "syscon"
+    - compatible: must be "brcm,bcm7445-cpu-biu-ctrl", "syscon"
 Optional properties:
@@ -52,7 +54,7 @@ example:
         hif_cpubiuctrl: syscon@...400 {
-            compatible = "brcm,bcm7445-hif-cpubiuctrl", "syscon";
+            compatible = "brcm,bcm7445-cpu-biu-ctrl", "brcm,brcmstb-cpu-biu-ctrl", "syscon";
             reg = <0x3e2400 0x5b4>;

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