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Date: Thu, 2 May 2019 11:04:30 +0000
From: Dragan Cvetic <draganc@...inx.com>
To: Rob Herring <robh@...nel.org>
CC: "arnd@...db.de" <arnd@...db.de>,
"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
Michal Simek <michals@...inx.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"mark.rutland@....com" <mark.rutland@....com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Derek Kiernan <dkiernan@...inx.com>
Subject: RE: [PATCH V3 01/12] dt-bindings: xilinx-sdfec: Add SDFEC binding
Hi Rob,
Please find my inline comments below
Thank you
Dragan
> -----Original Message-----
> From: Rob Herring [mailto:robh@...nel.org]
> Sent: Wednesday 1 May 2019 20:48
> To: Dragan Cvetic <draganc@...inx.com>
> Cc: arnd@...db.de; gregkh@...uxfoundation.org; Michal Simek <michals@...inx.com>; linux-arm-kernel@...ts.infradead.org;
> mark.rutland@....com; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; Derek Kiernan <dkiernan@...inx.com>
> Subject: Re: [PATCH V3 01/12] dt-bindings: xilinx-sdfec: Add SDFEC binding
>
> On Sat, Apr 27, 2019 at 11:04:55PM +0100, Dragan Cvetic wrote:
> > 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..425b6a6
> > --- /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".
>
> Perhaps append with '-bits' and make the values 0, 128, 256, 512.
>
The suggested will require the extra code for converting from 128,256,512 to 1,2,4, as HW is configured with 1, 2 and 4.
> > +- 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".
>
> Same here.
>
Same comment as previous one.
> > +Optional properties:
> > +- interrupts: should contain SDFEC interrupt number
>
> The interrupt may not be wired?
My mistake. It should stay:
interrupt-parent = <&axi_intc>;
interrupts = <1 0>;
>
> > +
> > +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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