This adds documentation for the MediaTek Global Command Engine (GCE) unit found in MT8173 SoCs. Signed-off-by: HS Liao <hs.liao@xxxxxxxxxxxx> Acked-by: Rob Herring <robh@xxxxxxxxxx> --- .../devicetree/bindings/soc/mediatek/gce.txt | 44 ++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/mediatek/gce.txt diff --git a/Documentation/devicetree/bindings/soc/mediatek/gce.txt b/Documentation/devicetree/bindings/soc/mediatek/gce.txt new file mode 100644 index 0000000..55c4105 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/mediatek/gce.txt @@ -0,0 +1,44 @@ +MediaTek GCE +=============== + +The Global Command Engine (GCE) is used to help read/write registers with +critical time limitation, such as updating display configuration during the +vblank. The GCE can be used to implement the Command Queue (CMDQ) driver. + +CMDQ driver uses mailbox framework for communication. Please refer to +../../mailbox/mailbox.txt for generic information about mailbox device-tree +bindings. + +Required properties: +- compatible: Must be "mediatek,mt8173-gce" +- reg: Address range of the GCE unit +- interrupts: The interrupt signal from the GCE block +- clock: Clocks according to the common clock binding +- clock-names: Must be "gce" to stand for GCE clock +- #mbox-cells: Should be 2 + +Required properties for a client device: +- mboxes: client use mailbox to communicate with GCE, it should have this + property and list of phandle, mailbox channel specifiers, and atomic + execution flag. + +Example: + + gce: gce@10212000 { + compatible = "mediatek,mt8173-gce"; + reg = <0 0x10212000 0 0x1000>; + interrupts = <GIC_SPI 135 IRQ_TYPE_LEVEL_LOW>; + clocks = <&infracfg CLK_INFRA_GCE>; + clock-names = "gce"; + + #mbox-cells = <2>; + }; + +Example for a client device: + + mmsys: clock-controller@14000000 { + compatible = "mediatek,mt8173-mmsys"; + mboxes = <&gce 0 1 /* main display with atomic execution */ + &gce 1 1>; /* sub display with atomic execution */ + ... + }; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html