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author | Florian Fainelli <f.fainelli@gmail.com> | 2015-09-14 12:04:22 -0700 |
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committer | Florian Fainelli <f.fainelli@gmail.com> | 2015-09-17 10:27:21 -0700 |
commit | 82f46c465149137a8d230b6c1e08c43bf6e32cdb (patch) | |
tree | e1e232e66fa2e42585c190a081696d65d359d379 /Documentation | |
parent | aca770fb4f9a88434e77b922743e5010a43f73d1 (diff) | |
download | linux-stable-82f46c465149137a8d230b6c1e08c43bf6e32cdb.tar.gz linux-stable-82f46c465149137a8d230b6c1e08c43bf6e32cdb.tar.bz2 linux-stable-82f46c465149137a8d230b6c1e08c43bf6e32cdb.zip |
Documentation: bindings: brcmstb: Document write-pairing
Document the hif-cpubiuctrl node a bit more, and add a documentation
entry for the optional "brcm,write-pairing" property.
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Gregory Fong <gregory.0xf0@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt index 94429649687e..0d0c1ae81bed 100644 --- a/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt +++ b/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt @@ -20,6 +20,25 @@ system control is required: - compatible: "brcm,bcm<chip_id>-hif-cpubiuctrl", "syscon" - compatible: "brcm,bcm<chip_id>-hif-continuation", "syscon" +hif-cpubiuctrl 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. + +Required properties: + + - compatible: must be "brcm,bcm7445-hif-cpubiuctrl", "syscon" + +Optional properties: + + - brcm,write-pairing: + Boolean property, which when present indicates that the chip + supports write-pairing. + example: rdb { #address-cells = <1>; @@ -35,6 +54,7 @@ example: hif_cpubiuctrl: syscon@3e2400 { compatible = "brcm,bcm7445-hif-cpubiuctrl", "syscon"; reg = <0x3e2400 0x5b4>; + brcm,write-pairing; }; hif_continuation: syscon@452000 { |