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Date: Wed, 19 Jun 2024 22:06:08 -0300
From: Mark Watson <markus.c.watson@...il.com>
To: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: misc: axi-fifo: Add binding for AXI-Stream FIFO
This resolves a checkpatch warning in drivers/staging/axis-fifo
regarding a missing devie-tree binding. The full warning is included
below.
WARNING: DT compatible string "xlnx,axi-fifo-mm-s-4.1" appears
un-documented -- check ./Documentation/devicetree/bindings/
+ { .compatible = "xlnx,axi-fifo-mm-s-4.1", },
Signed-off-by: Mark Watson <markus.c.watson@...il.com>
---
.../bindings/misc/xlnx,axi-fifo-mm-s-4.1.yaml | 214 ++++++++++++++++++
1 file changed, 214 insertions(+)
create mode 100644 Documentation/devicetree/bindings/misc/xlnx,axi-fifo-mm-s-4.1.yaml
diff --git a/Documentation/devicetree/bindings/misc/xlnx,axi-fifo-mm-s-4.1.yaml b/Documentation/devicetree/bindings/misc/xlnx,axi-fifo-mm-s-4.1.yaml
new file mode 100644
index 000000000000..cfb335752054
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/xlnx,axi-fifo-mm-s-4.1.yaml
@@ -0,0 +1,214 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/xlnx,axi-fifo-mm-s-4.1.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx AXI-Stream FIFO v4.1 IP core
+
+description: |
+ The Xilinx AXI-Stream FIFO v4.1 IP core has read and write AXI-Stream FIFOs,
+ the contents of which can be accessed from the AXI4 memory-mapped interface.
+ This is useful for transferring data from a processor into the FPGA fabric.
+ The driver creates a character device that can be read/written to with
+ standard open/read/write/close operations.
+
+ See Xilinx PG080 document for IP details.
+
+ Currently supports only store-forward mode with a 32-bit AXI4-Lite
+ interface.
+
+ DOES NOT support:
+ - cut-through mode
+ - AXI4 (non-lite)
+
+properties:
+ compatible:
+ const: xlnx,axi-fifo-mm-s-4.1
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ interrupt-names:
+ items:
+ - const: interrupt
+
+ interrupt-parent:
+ $ref: /schemas/types.yaml#/definitions/phandle
+
+ xlnx,axi-str-rxd-protocol:
+ const: XIL_AXI_STREAM_ETH_DATA
+
+ xlnx,axi-str-rxd-tdata-width:
+ const: 0x20
+
+ xlnx,axi-str-txc-protocol:
+ const: XIL_AXI_STREAM_ETH_CTRL
+
+ xlnx,axi-str-txc-tdata-width:
+ const: 0x20
+
+ xlnx,axi-str-txd-protocol:
+ const: XIL_AXI_STREAM_ETH_DATA
+
+ xlnx,axi-str-txd-tdata-width:
+ const: 0x20
+
+ xlnx,axis-tdest-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,axis-tid-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,axis-tuser-width:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,data-interface-type:
+ const: 0x0
+
+ xlnx,has-axis-tdest:
+ const: 0x0
+
+ xlnx,has-axis-tid:
+ const: 0x0
+
+ xlnx,has-axis-tkeep:
+ const: 0x1
+
+ xlnx,has-axis-tstrb:
+ const: 0x0
+
+ xlnx,has-axis-tuser:
+ const: 0x0
+
+ xlnx,rx-fifo-depth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,rx-fifo-pe-threshold:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,rx-fifo-pf-threshold:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,s-axi-id-width:
+ const: 0x4
+
+ xlnx,s-axi4-data-width:
+ const: 0x20
+
+ xlnx,select-xpm:
+ const: 0x0
+
+ xlnx,tx-fifo-depth:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,tx-fifo-pe-threshold:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,tx-fifo-pf-threshold:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,use-rx-cut-through:
+ const: 0x0
+
+ xlnx,use-rx-data:
+ const: 0x1
+
+ xlnx,use-tx-ctrl:
+ const: 0x0
+
+ xlnx,use-tx-cut-through:
+ const: 0x0
+
+ xlnx,use-tx-data:
+ const: 0x1
+
+ xlnx,tx-max-pkt-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+ xlnx,rx-min-pkt-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - interrupt-names
+ - interrupt-parent
+ - xlnx,axi-str-rxd-protocol
+ - xlnx,axi-str-rxd-tdata-width
+ - xlnx,axi-str-txc-protocol
+ - xlnx,axi-str-txc-tdata-width
+ - xlnx,axi-str-txd-protocol
+ - xlnx,axi-str-txd-tdata-width
+ - xlnx,axis-tdest-width
+ - xlnx,axis-tid-width
+ - xlnx,axis-tuser-width
+ - xlnx,data-interface-type
+ - xlnx,has-axis-tdest
+ - xlnx,has-axis-tid
+ - xlnx,has-axis-tkeep
+ - xlnx,has-axis-tstrb
+ - xlnx,has-axis-tuser
+ - xlnx,rx-fifo-depth
+ - xlnx,rx-fifo-pe-threshold
+ - xlnx,rx-fifo-pf-threshold
+ - xlnx,s-axi-id-width
+ - xlnx,s-axi4-data-width
+ - xlnx,select-xpm
+ - xlnx,tx-fifo-depth
+ - xlnx,tx-fifo-pe-threshold
+ - xlnx,tx-fifo-pf-threshold
+ - xlnx,use-rx-cut-through
+ - xlnx,use-rx-data
+ - xlnx,use-tx-ctrl
+ - xlnx,use-tx-cut-through
+ - xlnx,use-tx-data
+ - xlnx,tx-max-pkt-size
+ - xlnx,rx-min-pkt-size
+
+additionalProperties: false
+
+examples:
+ - |
+ axi_fifo_mm_s_0: axi_fifo_mm_s@...00000 {
+ compatible = "xlnx,axi-fifo-mm-s-4.1";
+ interrupt-names = "interrupt";
+ interrupt-parent = <&intc>;
+ interrupts = <0 29 4>;
+ reg = <0x43c00000 0x10000>;
+ xlnx,axi-str-rxd-protocol = "XIL_AXI_STREAM_ETH_DATA";
+ xlnx,axi-str-rxd-tdata-width = <0x20>;
+ xlnx,axi-str-txc-protocol = "XIL_AXI_STREAM_ETH_CTRL";
+ xlnx,axi-str-txc-tdata-width = <0x20>;
+ xlnx,axi-str-txd-protocol = "XIL_AXI_STREAM_ETH_DATA";
+ xlnx,axi-str-txd-tdata-width = <0x20>;
+ xlnx,axis-tdest-width = <0x4>;
+ xlnx,axis-tid-width = <0x4>;
+ xlnx,axis-tuser-width = <0x4>;
+ xlnx,data-interface-type = <0x0>;
+ xlnx,has-axis-tdest = <0x0>;
+ xlnx,has-axis-tid = <0x0>;
+ xlnx,has-axis-tkeep = <0x1>;
+ xlnx,has-axis-tstrb = <0x0>;
+ xlnx,has-axis-tuser = <0x0>;
+ xlnx,rx-fifo-depth = <0x200>;
+ xlnx,rx-fifo-pe-threshold = <0x2>;
+ xlnx,rx-fifo-pf-threshold = <0x1fb>;
+ xlnx,s-axi-id-width = <0x4>;
+ xlnx,s-axi4-data-width = <0x20>;
+ xlnx,select-xpm = <0x0>;
+ xlnx,tx-fifo-depth = <0x8000>;
+ xlnx,tx-fifo-pe-threshold = <0x200>;
+ xlnx,tx-fifo-pf-threshold = <0x7ffb>;
+ xlnx,use-rx-cut-through = <0x0>;
+ xlnx,use-rx-data = <0x0>;
+ xlnx,use-tx-ctrl = <0x0>;
+ xlnx,use-tx-cut-through = <0x0>;
+ xlnx,use-tx-data = <0x1>;
+ xlnx,tx-max-pkt-size = <257>;
+ xlnx,rx-min-pkt-size = <255>;
+ };
--
2.34.1
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