linux-kernel - [PATCH v9 0/3] Altera Cyclone Passive Serial SPI FPGA Manager

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Date:   Tue, 24 Jan 2017 14:19:31 -0800
From:   Joshua Clayton <stillcompiling@...il.com>
To:     Alan Tull <atull@...nsource.altera.com>,
        Moritz Fischer <moritz.fischer@...us.com>,
        Russell King <linux@...linux.org.uk>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Anatolij Gustschin <agust@...x.de>,
        Joshua Clayton <stillcompiling@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-fpga@...r.kernel.org
Subject: [PATCH v9 0/3] Altera Cyclone Passive Serial SPI FPGA Manager

>From c429cec34a880c0d5438091f436a5946a4db3fc0 Mon Sep 17 00:00:00 2001
Message-Id: <cover.1485211400.git.stillcompiling@...il.com>
From: Joshua Clayton <stillcompiling@...il.com>
Date: Mon, 23 Jan 2017 14:43:20 -0800
Subject: [PATCH v8 0/3] Altera Cyclone Passive Serial SPI FPGA Manager

This series adds an FPGA manager for Altera cyclone FPGAs
that can program them using an spi port and a couple of gpios, using
Alteras passive serial protocol.

Changes from v8:
- List the confd pin as optional (it is an additional way to confirm
  the FPGA is done loading, but is not accessible in my hardare)

Changes from v7:
Add Rob Herrings Ack on the bindings change (Thanks!)
Change const u8* to const char * to make sparse happy

Changes from v6:
- moved bitrev8x4() out (I'll submit it in a separate patch set)
- Changed the dts format to match what is already done in barebox
  (see https://git.pengutronix.de/cgit/barebox/tree/Documentation/devicetree/bindings/firmware/altr,passive-serial.txt)
- Changed error message from "Status pin should be low" to "Status
  pin failed to show a reset" for better clarity
- Fixed any whitespace problems that had crept in.

Changes from v5:
- Rebased on next-20161214xi
- Corrected for FPGA Mgr API change in  write_init() and write_complete()
- Better describe the device cyclone-ps-spi runs on in the file header.
- Split the bitrev8x4 patch into generic and arch specific patches...
- Added AARCH64 and MIPS implementations of bitrev8x4()... they all have to 
  have an implementation for it to compile cleanly across platforms
- Added the changes to imx6q-evi.dts to the patch set.

Changes from v4:
- Added the needed return statement to __arch_bitrev8x4()
- Added Rob Herrings ACK for and fix a typo in the commit log of patch 2

Changes from v3:
- Fixed up the state() function to return the state of the status pin
  reqested by Alan Tull
- Switched the pin to ACTIVE_LOW and coresponding logic level, and updated
  the corresponding documentation. Thanks Rob Herring for pointing out my
  mistake.
- Per Rob Herring, switched from "gpio" to "gpios" in dts

Changes from v2:
- Merged patch 3 and 4 as suggested in review by Moritz Fischer
- Changed FPGA_MIN_DELAY from 250 to 50 ms is the time advertized by
  Altera. This now works, as we don't assume it is done

Changes from v1:
- Changed the name from cyclone-spi-fpga-mgr to cyclone-ps-spi-fpga-mgr
  This name change was requested by Alan Tull, to be specific about which
  programming method is being employed on the fpga.
- Changed the name of the reset-gpio to config-gpio to closer match the
  way the pins are described in the Altera manual
- Moved MODULE_LICENCE, _AUTHOR, and _DESCRIPTION to the bottom

- Added a bitrev8x4() function to the bitrev headers and implemented ARM
 const, runtime, and ARM specific faster versions (This may end up
 needing to be a standalone patch)

- Moved the bitswapping into cyclonespi_write(), as requested.
  This falls short of my desired generic lsb first spi support, but is a step
  in that direction.

- Fixed whitespace problems introduced during refactoring

- Replaced magic number for initial delay with a descriptive macro
- Poll the fpga to see when it is ready rather than a fixed 1 ms sleep

*** BLURB HERE ***

Joshua Clayton (3):
  doc: dt: add cyclone-ps-spi binding document
  fpga manager: Add cyclone-ps-spi driver for Altera FPGAs
  ARM: dts: imx6q-evi: support cyclone-ps-spi

 .../bindings/fpga/altera-passive-serial.txt        |  29 ++++
 arch/arm/boot/dts/imx6q-evi.dts                    |  16 ++
 drivers/fpga/Kconfig                               |   7 +
 drivers/fpga/Makefile                              |   1 +
 drivers/fpga/cyclone-ps-spi.c                      | 185 +++++++++++++++++++++
 5 files changed, 238 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/altera-passive-serial.txt
 create mode 100644 drivers/fpga/cyclone-ps-spi.c

-- 
2.9.3