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ed6daf2b28
Some properties were parsed from the device tree and then ignored by the driver. Some would return an error if absent from the device tree, then return an error if they were found because they are unsupported by the driver. Avoid parsing unused properties and clearly explain in the documentation the ignored / unsupported properties. Signed-off-by: Quentin Deslandes <quentin.deslandes@itdev.co.uk> Link: https://lore.kernel.org/r/20191101214232.16960-2-quentin.deslandes@itdev.co.uk Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
93 lines
3.9 KiB
Text
93 lines
3.9 KiB
Text
Xilinx AXI-Stream FIFO v4.1 IP core
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This IP core has read and write AXI-Stream FIFOs, the contents of which can
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be accessed from the AXI4 memory-mapped interface. This is useful for
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transferring data from a processor into the FPGA fabric. The driver creates
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a character device that can be read/written to with standard
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open/read/write/close.
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See Xilinx PG080 document for IP details.
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Currently supports only store-forward mode with a 32-bit
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AXI4-Lite interface. DOES NOT support:
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- cut-through mode
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- AXI4 (non-lite)
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Required properties:
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- compatible: Should be "xlnx,axi-fifo-mm-s-4.1"
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- interrupt-names: Should be "interrupt"
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- interrupt-parent: Should be <&intc>
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- interrupts: Should contain interrupts lines.
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- reg: Should contain registers location and length.
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- xlnx,axi-str-rxd-protocol: Should be "XIL_AXI_STREAM_ETH_DATA"
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- xlnx,axi-str-rxd-tdata-width: Should be <0x20>
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- xlnx,axi-str-txc-protocol: Should be "XIL_AXI_STREAM_ETH_CTRL"
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- xlnx,axi-str-txc-tdata-width: Should be <0x20>
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- xlnx,axi-str-txd-protocol: Should be "XIL_AXI_STREAM_ETH_DATA"
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- xlnx,axi-str-txd-tdata-width: Should be <0x20>
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- xlnx,axis-tdest-width: AXI-Stream TDEST width (ignored by the driver)
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- xlnx,axis-tid-width: AXI-Stream TID width (ignored by the driver)
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- xlnx,axis-tuser-width: AXI-Stream TUSER width (ignored by the driver)
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- xlnx,data-interface-type: Should be <0x0> (ignored by the driver)
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- xlnx,has-axis-tdest: Should be <0x0> (this feature isn't supported)
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- xlnx,has-axis-tid: Should be <0x0> (this feature isn't supported)
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- xlnx,has-axis-tkeep: Should be <0x0> (this feature isn't supported)
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- xlnx,has-axis-tstrb: Should be <0x0> (this feature isn't supported)
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- xlnx,has-axis-tuser: Should be <0x0> (this feature isn't supported)
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- xlnx,rx-fifo-depth: Depth of RX FIFO in words
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- xlnx,rx-fifo-pe-threshold: RX programmable empty interrupt threshold
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(ignored by the driver)
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- xlnx,rx-fifo-pf-threshold: RX programmable full interrupt threshold
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(ignored by the driver)
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- xlnx,s-axi-id-width: Should be <0x4> (ignored by the driver)
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- xlnx,s-axi4-data-width: Should be <0x20> (ignored by the driver)
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- xlnx,select-xpm: Should be <0x0> (ignored by the driver)
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- xlnx,tx-fifo-depth: Depth of TX FIFO in words
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- xlnx,tx-fifo-pe-threshold: TX programmable empty interrupt threshold
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(ignored by the driver)
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- xlnx,tx-fifo-pf-threshold: TX programmable full interrupt threshold
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(ignored by the driver)
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- xlnx,use-rx-cut-through: Should be <0x0> (this feature isn't supported)
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- xlnx,use-rx-data: <0x1> if RX FIFO is enabled, <0x0> otherwise
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- xlnx,use-tx-ctrl: Should be <0x0> (this feature isn't supported)
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- xlnx,use-tx-cut-through: Should be <0x0> (this feature isn't supported)
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- xlnx,use-tx-data: <0x1> if TX FIFO is enabled, <0x0> otherwise
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Example:
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axi_fifo_mm_s_0: axi_fifo_mm_s@43c00000 {
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compatible = "xlnx,axi-fifo-mm-s-4.1";
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interrupt-names = "interrupt";
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interrupt-parent = <&intc>;
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interrupts = <0 29 4>;
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reg = <0x43c00000 0x10000>;
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xlnx,axi-str-rxd-protocol = "XIL_AXI_STREAM_ETH_DATA";
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xlnx,axi-str-rxd-tdata-width = <0x20>;
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xlnx,axi-str-txc-protocol = "XIL_AXI_STREAM_ETH_CTRL";
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xlnx,axi-str-txc-tdata-width = <0x20>;
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xlnx,axi-str-txd-protocol = "XIL_AXI_STREAM_ETH_DATA";
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xlnx,axi-str-txd-tdata-width = <0x20>;
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xlnx,axis-tdest-width = <0x4>;
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xlnx,axis-tid-width = <0x4>;
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xlnx,axis-tuser-width = <0x4>;
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xlnx,data-interface-type = <0x0>;
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xlnx,has-axis-tdest = <0x0>;
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xlnx,has-axis-tid = <0x0>;
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xlnx,has-axis-tkeep = <0x0>;
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xlnx,has-axis-tstrb = <0x0>;
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xlnx,has-axis-tuser = <0x0>;
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xlnx,rx-fifo-depth = <0x200>;
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xlnx,rx-fifo-pe-threshold = <0x2>;
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xlnx,rx-fifo-pf-threshold = <0x1fb>;
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xlnx,s-axi-id-width = <0x4>;
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xlnx,s-axi4-data-width = <0x20>;
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xlnx,select-xpm = <0x0>;
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xlnx,tx-fifo-depth = <0x8000>;
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xlnx,tx-fifo-pe-threshold = <0x200>;
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xlnx,tx-fifo-pf-threshold = <0x7ffb>;
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xlnx,use-rx-cut-through = <0x0>;
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xlnx,use-rx-data = <0x0>;
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xlnx,use-tx-ctrl = <0x0>;
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xlnx,use-tx-cut-through = <0x0>;
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xlnx,use-tx-data = <0x1>;
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};
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