linux-kernel - Re: [PATCH 00/12] misc: xilinx sd-fec driver

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Date:   Tue, 19 Mar 2019 13:17:49 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     Dragan Cvetic <dragan.cvetic@...inx.com>, <arnd@...db.de>,
        <gregkh@...uxfoundation.org>, <michal.simek@...inx.com>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>,
        Derek Kiernan <derek.kiernan@...inx.com>
Subject: Re: [PATCH 00/12] misc: xilinx sd-fec driver

On 19. 03. 19 13:04, Dragan Cvetic wrote:
> This patchset is adding the full Soft Decision Forward Error
> Correction (SD-FEC) driver implementation, driver DT binding and
> driver documentation.
> 
> Forward Error Correction (FEC) codes such as Low Density Parity
> Check (LDPC) and turbo codes provide a means to control errors in
> data transmissions over unreliable or noisy communication
> channels. The SD-FEC Integrated Block is an optimized block for
> soft-decision decoding of these codes. Fixed turbo codes are
> supported directly, whereas custom and standardized LDPC codes
> are supported through the ability to specify the parity check
> matrix through an AXI4-Lite bus or using the optional programmable
> (PL)-based support logic. For the further information see
> https://www.xilinx.com/support/documentation/ip_documentation/
> sd_fec/v1_1/pg256-sdfec-integrated-block.pdf
> 
> This driver is a platform device driver which supports SDFEC16
> (16nm) IP. SD-FEC driver supports LDPC decoding and encoding and
> Turbo code decoding. LDPC codes can be specified on
> a codeword-by-codeword basis, also a custom LDPC code can be used.
> 
> The SD-FEC driver exposes a char device interface and supports
> file operations: open(), close(), poll() and ioctl(). The driver
> allows only one usage of the device, open() limits the number of
> driver instances. The driver also utilize Common Clock Framework
> (CCF).
> 
> The control and monitoring is supported over ioctl system call.
> The features supported by ioctl():
> - enable or disable data pipes to/from device
> - configure the FEC algorithm parameters
> - set the order of data
> - provide a control of a SDFEC bypass option
> - activates/deactivates SD-FEC
> - collect and provide statistical data
> - enable/disable interrupt mode
> 
> Poll can be utilized to detect errors on IRQ trigger rather than
> using looping status and stats ioctl's.
> 
> Reviewed-by: Michal Simek <michal.simek@...inx.com>

I am not using this tag a lot that's why I am curious where you got it
from? I can't see it in Xilinx tree too.

Thanks,
Michal