79 lines
2.7 KiB
Plaintext
79 lines
2.7 KiB
Plaintext
Mediatek MMQoS Network-On-Chip interconnect driver binding
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=========================================
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= MMQoS interconnect providers =
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The Mediatek MMQoS(Multimedia Quality of Service) interconnect provider will
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collect bandwidth requests from MM users, such as display, camera, mdp and
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video codec. The collected bandwidth information is used to configure SMI
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settings dynamically and pass the bandwidth information to dvfsrc.
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About the SMI architecture, please refer to the following documents.
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Documentation/devicetree/bindings/memory-controllers/mediatek,smi-common.txt
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Documentation/devicetree/bindings/memory-controllers/mediatek,smi-larb.txt
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About dvfsrc, please refer to
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Documentation/devicetree/bindings/soc/mediatek/dvfsrc.txt.
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Required properties:
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- compatible: must contain only one of the following:
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"mediatek,mt6779-mmqos"
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- #interconnect-cells: must be 1
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- mediatek,larbs: contains a list of phandles of smi larbs
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- clock, clock-names: clocks according to the common clock bindings.
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These are clocks for smi common hardwares and they
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should be in order of the index of smi common. For
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example, the first element should be the clock
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of SLAVE_COMMON(0) defined in the MMQoS driver, and the
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second element should be the clock of SLAVE_COMMON(1).
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- interconnects: contains interconnect paths to pass bandwidth to dvfsrc.
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interconnect node id definition for dvfsrc is defined in:
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include/dt-bindings/interconnect/mtk,mt6779-emi.h
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- interconnect-names: path names in interconnects property.
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Example:
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mmqos: interconnect {
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compatible = "mediatek,mt6779-mmqos";
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#interconnect-cells = <1>;
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mediatek,larbs = <&larb0 &larb1 &larb2 &larb3
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&larb5 &larb7 &larb8 &larb9
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&larb10 &larb11>;
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clocks = <&topckgen CLK_TOP_MM>;
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clock-names = "mm_sel";
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interconnects = <&ddr_emi MT6779_MASTER_MMSYS
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&ddr_emi MT6779_SLAVE_DDR_EMI>;
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interconnect-names = "mmsys_path";
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};
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= MMQoS interconnect consumers =
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Required properties:
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interconnects: contains interconnect paths to report bandwidth information
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Use some macros to define interconnet node ID and these macros
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are defined in:
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include/dt-bindings/interconnect/mtk,mmqos.h
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Source port:
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Use M4U port definition in:
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include/dt-bindings/memory/mt6779-larb-port.h
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Use MASTER_LARB_PORT macro to translate M4U port ID to
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interconnect node ID
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Destination port:
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mt6779: must be SLAVE_COMMON(0)
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interconnect-names: path names for interconnects property
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Example:
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vcodec_dec: vcodec@16000000 {
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...
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interconnects = <&mmqos MASTER_LARB_PORT(M4U_PORT_HW_VDEC_MC_EXT)
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&mmqos SLAVE_COMMON(0)>,
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<&mmqos MASTER_LARB_PORT(M4U_PORT_HW_VDEC_UFO_EXT)
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&mmqos SLAVE_COMMON(0)>;
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interconnect-names = "vdec_mc_ext", "vdec_ufo_ext";
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};
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