[PATCH 0/2 v6] Lattice MachXO2 Slave SPI FPGA Manager support

From: Paolo Pisati <p.pisati@gmail.com>
To: Alan Tull <atull@kernel.org>, Moritz Fischer <mdf@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>
Cc: linux-fpga@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 0/2 v6] Lattice MachXO2 Slave SPI FPGA Manager support
Date: Fri, 16 Mar 2018 16:54:27 +0100	[thread overview]
Message-ID: <1521215669-23874-1-git-send-email-p.pisati@gmail.com> (raw)

Hi all,
this series adds support for the Lattice MachXO2 FPGA chip, programmed
over Slave SPI.

Tested on a raspberry pi3, beaglebone black (little endian mode) and imx6
hummingboard (big endian mode) + bugblat's pif2 fpga hat (machxo2 7000HC) or
tinyfpga A1/A2 (machxo2 256HC / 1200HC), in SPI slave mode with varying bus
speed.

Changes since v5:
* fixed all the endianess issues
* introduced a cleanup() path invoked in case of flash failure
* moved back machxo2_write() to use a spi_sync() transaction per line write
  (in v5 i queued all the spi_write()s and executed a single spi_sync() at the
  end, but that, sometimes, resulted in the REFRESH command to fail with a
  CMD_ERR, depending on the SPI bus speed)

Paolo Pisati (2):
  dt: bindings: fpga: add lattice machxo2 slave spi binding description
  fpga: lattice machxo2: Add Lattice MachXO2 support

 .../bindings/fpga/lattice-machxo2-spi.txt          |  29 ++
 drivers/fpga/Kconfig                               |   8 +
 drivers/fpga/Makefile                              |   1 +
 drivers/fpga/machxo2-spi.c                         | 410 +++++++++++++++++++++
 4 files changed, 448 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/fpga/lattice-machxo2-spi.txt
 create mode 100644 drivers/fpga/machxo2-spi.c

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2.7.4