Hello,
This patchset adds a new driver for the 7 series FPGA's SelectMAP
interface.
The SelectMAP interface shares a common GPIO protocol with the SPI
interface which is already in the kernel (drivers/fpga/xilinx-spi.c).
The approach proposed in this patchset is to refactor xilinx-spi.c into
xilinx-core.c which would handle the common GPIO protocol. This is then
used to build two drivers, the already existing xilinx-spi.c driver and
a newly added xilinx-selectmap.c driver.
The SelectMAP driver proposed only supports 8 bit mode. This is because
the 16 and 32 bits mode have limitations with regards to compressed
bitstream support as well as introducing endianness considerations.
I'm testing xilinx-selectmap.c on a custom i.MX6 board connected to an
Artix 7 FPGA. Flashing a 913K bitstream takes 0.44 seconds.
Changes since v3: (from Rob Herring review)
* Fix an error in the DT binding example compatible.
* Drop the renaming of "prog_b" to "prog" and "init-b" to "init".
Patches 2 and 3 are removed.
Changes since v2:
* Inserted patch 2 and 3 which rename "prog_b" and "init-b" into "prog"
and "init" for the SPI driver.
* From Krzysztof Kozlowski review's:
* Use more specific compatible names
* Remove other missing occurences of the slave word missed in v2.
* From Xu Yilun review's:
* Fix vertical whitespace in get_done_gpio().
* Combine write() and write_one_dummy_byte() together.
* Eliminate most of the xilinx_core_probe() arguments, the driver
needs to populate those directly into the xilinx_fpga_core struct.
Added some documentation to struct xilinx_fpga_core to clarify
this.
* Removed typedefs from xilinx-core.h.
* Moved null checks in xilinx_core_probe() to first patch.
* Move csi_b and rdwr_b out of xilinx_selectmap_conf as they are not
used out of the probe function.
Changes since v1: (from Krzysztof Kozlowski review's)
* Use more conventional names for gpio DT bindings
* fix example in DT bindings
* add mc-peripheral-props.yaml to DT bindings
* fix various formatting mistakes
* Remove all occurences of the "slave" word.
Charles Perry (3):
fpga: xilinx-spi: extract a common driver core
dt-bindings: fpga: xlnx,fpga-selectmap: add DT schema
fpga: xilinx-selectmap: add new driver
.../bindings/fpga/xlnx,fpga-selectmap.yaml | 86 +++++++
drivers/fpga/Kconfig | 12 +
drivers/fpga/Makefile | 2 +
drivers/fpga/xilinx-core.c | 208 +++++++++++++++++
drivers/fpga/xilinx-core.h | 28 +++
drivers/fpga/xilinx-selectmap.c | 97 ++++++++
drivers/fpga/xilinx-spi.c | 212 ++----------------
7 files changed, 446 insertions(+), 199 deletions(-)
create mode 100644 Documentation/devicetree/bindings/fpga/xlnx,fpga-selectmap.yaml
create mode 100644 drivers/fpga/xilinx-core.c
create mode 100644 drivers/fpga/xilinx-core.h
create mode 100644 drivers/fpga/xilinx-selectmap.c
--
2.43.0
