linux-kernel - [PATCH 01/12] dt-bindings: xilinx-sdfec: Add SDFEC binding

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Date:   Tue, 19 Mar 2019 12:04:13 +0000
From:   Dragan Cvetic <dragan.cvetic@...inx.com>
To:     <arnd@...db.de>, <gregkh@...uxfoundation.org>,
        <michal.simek@...inx.com>, <linux-arm-kernel@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>,
        Dragan Cvetic <dragan.cvetic@...inx.com>,
        Derek Kiernan <derek.kiernan@...inx.com>
Subject: [PATCH 01/12] dt-bindings: xilinx-sdfec: Add SDFEC binding

Add the Soft Decision Forward Error Correction (SDFEC) Engine
bindings which is available for the Zynq UltraScale+ RFSoC
FPGA's.

Signed-off-by: Dragan Cvetic <dragan.cvetic@...inx.com>
Signed-off-by: Derek Kiernan <derek.kiernan@...inx.com>
---
 .../devicetree/bindings/misc/xlnx,sd-fec.txt       | 58 ++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/misc/xlnx,sd-fec.txt

diff --git a/Documentation/devicetree/bindings/misc/xlnx,sd-fec.txt b/Documentation/devicetree/bindings/misc/xlnx,sd-fec.txt
new file mode 100644
index 0000000..8af0adc
--- /dev/null
+++ b/Documentation/devicetree/bindings/misc/xlnx,sd-fec.txt
@@ -0,0 +1,58 @@
+* Xilinx SDFEC(16nm) IP *
+
+The Soft Decision Forward Error Correction (SDFEC) Engine is a Hard IP block
+which provides high-throughput LDPC and Turbo Code implementations.
+The LDPC decode & encode functionality is capable of covering a range of
+customer specified Quasi-cyclic (QC) codes. The Turbo decode functionality
+principally covers codes used by LTE. The FEC Engine offers significant
+power and area savings versus implementations done in the FPGA fabric.
+
+
+Required properties:
+- compatible: Must be "xlnx,sd-fec-1.1"
+- clock-names : List of input clock names from the following:
+    - "core_clk", Main processing clock for processing core (required)
+    - "s_axi_aclk", AXI4-Lite memory-mapped slave interface clock (required)
+    - "s_axis_din_aclk", DIN AXI4-Stream Slave interface clock (optional)
+    - "s_axis_din_words-aclk", DIN_WORDS AXI4-Stream Slave interface clock (optional)
+    - "s_axis_ctrl_aclk",  Control input AXI4-Stream Slave interface clock (optional)
+    - "m_axis_dout_aclk", DOUT AXI4-Stream Master interface clock (optional)
+    - "m_axis_dout_words_aclk", DOUT_WORDS AXI4-Stream Master interface clock (optional)
+    - "m_axis_status_aclk", Status output AXI4-Stream Master interface clock (optional)
+- clocks : Clock phandles (see clock_bindings.txt for details).
+- reg: Should contain Xilinx SDFEC 16nm Hardened IP block registers
+  location and length.
+- xlnx,sdfec-code : Should contain "ldpc" or "turbo" to describe the codes
+  being used.
+- xlnx,sdfec-din-words : A value 0 indicates that the DIN_WORDS interface is
+  driven with a fixed value and is not present on the device, a value of 1
+  configures the DIN_WORDS to be block based, while a value of 2 configures the
+  DIN_WORDS input to be supplied for each AXI transaction.
+- xlnx,sdfec-din-width : Configures the DIN AXI stream where a value of 1
+  configures a width of "1x128b", 2 a width of "2x128b" and 4 configures a width
+  of "4x128b".
+- xlnx,sdfec-dout-words : A value 0 indicates that the DOUT_WORDS interface is
+  driven with a fixed value and is not present on the device, a value of 1
+  configures the DOUT_WORDS to be block based, while a value of 2 configures the
+  DOUT_WORDS input to be supplied for each AXI transaction.
+- xlnx,sdfec-dout-width : Configures the DOUT AXI stream where a value of 1
+  configures a width of "1x128b", 2 a width of "2x128b" and 4 configures a width
+  of "4x128b".
+Optional properties:
+- interrupts: should contain SDFEC interrupt number
+
+Example
+---------------------------------------
+       sd_fec_0: sd-fec@...40000 {
+               compatible = "xlnx,sd-fec-1.1";
+               clock-names = "core_clk", "s_axi_aclk", "s_axis_ctrl_aclk", "s_axis_din_aclk", "m_axis_status_aclk", "m_axis_dout_aclk";
+               clocks = <&misc_clk_2>, <&misc_clk_0>, <&misc_clk_1>, <&misc_clk_1>, <&misc_clk_1>, <&misc_clk_1>;
+               reg = <0x0 0xa0040000 0x0 0x40000>;
+               interrupt-parent = <&gic>;
+               interrupts = <0 89 4>;
+               xlnx,sdfec-code = "ldpc";
+               xlnx,sdfec-din-words = <0>;
+               xlnx,sdfec-din-width = <2>;
+               xlnx,sdfec-dout-words = <0>;
+               xlnx,sdfec-dout-width = <1>;
+       };
--
2.7.4

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