linux-kernel - Re: [PATCH v13 0/2] Lattice sysCONFIG SPI FPGA manager

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Message-ID: <20221003054011.66zjgfkejzcv6jdc@x260>
Date:   Mon, 3 Oct 2022 08:40:11 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     mdf@...nel.org, hao.wu@...el.com, yilun.xu@...el.com,
        trix@...hat.com, dg@...ix.com, j.zink@...gutronix.de,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        system@...rotek.ru
Subject: Re: [PATCH v13 0/2]  Lattice sysCONFIG SPI FPGA manager

On Mon, Sep 26, 2022 at 05:39:22PM +0300, Ivan Bornyakov wrote:
> Add support to the FPGA manager for programming Lattice ECP5 FPGA over
> slave SPI sysCONFIG interface.
> 
> ChangeLog:
>   v1 -> v2:
>     * remove "spi" from compatible string
>     * reword description in dt-bindings doc
>     * add reference to spi-peripheral-props.yaml in dt-binding doc
>     * fix DTS example in dt-bindings doc: 4-spaces indentations, no
>       undersores in node names.
>   v2 -> v3:
>     * fix typo "##size-cells" -> "#size-cells" in dt-bindings example
>   v3 -> v4:
>     * dt-bindings: reword description
>     * dt-bindings: revert props order
>   v4 -> v5:
>     * dt-bindings: remove trailing dot from title
>     * dt-bindings: reword description to avoid driver reference
>     * dt-bindings: add "Reviewed-by: Krzysztof Kozlowski" tag
>   v5 -> v6:
>     * ecp5-spi: lock SPI bus for exclusive usage in
>       ecp5_ops_write_init(), release in ecp5_ops_write_complete()
>       or on error
>   v6 -> v7:
>     * ecp5-spi.c -> lattice-sysconfig-spi.c. Reworked to represent
>       generalized sysCONFIG port with implementations for ECP5 and
>       MachXO2
>     * lattice,ecp5-fpga-mgr.yaml -> lattice,sysconfig.yaml. Reworked to
>       document both ECP5 and MachXO2 sysCONFIG.
>     * dt-bindings: remove "Reviewed-by: Krzysztof Kozlowski" tag as doc
>       was rewritten by a considerable amount.
>   v7 -> v8:
>     * dt-bindings: move "program-gpios", "init-gpios" and "done-gpios"
>       to top-level properties and disallow them for MachXO2 variant.
>   v8 -> v9:
>     * dt-bindings: "program-gpios", "init-gpios" and "done-gpios" are
>       now optional for both ECP5 and MachXO2
>     * lattice-sysconfig-spi.c -> sysconfig-spi.c + sysconfig.c +
>       sysconfig.h
>         ** reworked to be one sysCONFIG FPGA Manager rather than two
> 	   distinct ECP5 and MachXO2 managers
> 	** splitted to port type agnostic sysconfig.c and SPI-specific
> 	   sysconfig-spi.c
> 	** command transfer function moved to callback for ease of
> 	   adding another port type, such as I2C
>   v9 -> v10:
>     * split sysconfig_transfer() callback into separate command_write()
>       and command_write_then_read(). There are too many transfers
>       without readback.
>     * add command_write_with_data() callback which performs single
>       transfer of command + data. It's needed for better abstraction of
>       paged bitstream write routine.
>     * move sysconfig_lsc_burst_init() to bitstream_burst_write_init()
>       callback to break dependence of sysconfig.c from sysconfig-spi.c
>     * move sysconfig_lsc_burst_complete() to bitstream_burst_write_complete()
>       callback to break dependence of sysconfig.c from sysconfig-spi.c
>     * add bitstream_burst_write() to abstract fpga_manager_ops->write()
>       from bus type
>     * remove struct spi_device from struct sysconfig_priv, use
>       to_spi_device()
>     * move fpga_manager_ops initialization to sysconfig.c
>   v10 -> v11:
>     * rename sysconfig_lsc_burst_init() to sysconfig_spi_lsc_burst_init()
>     * rename sysconfig_bitstream_burst_write() to
>       sysconfig_spi_bitstream_burst_write()
>     * rename sysconfig_lsc_burst_complete() to
>       sysconfig_spi_lsc_burst_complete()
>     * rename "ecp5-fpga-mgr" to "sysconfig-ecp5"
>     * rename "machxo2-fpga-mgr" to "sysconfig-machxo2"
>     * move spi_max_speed_hz from struct sysconfig_fpga_priv to
>       struct sysconfig_spi_fpga_priv, which is local to sysconfig-spi.c
>     * remove SPI bus unlock on write error form
>       sysconfig_spi_bitstream_burst_write(), call
>       sysconfig_burst_write_complete() on error in
>       sysconfig_bitstream_burst_write() instead.
>   v11 -> v12:
>     * build sysconfig core as separate module to prevent duplication of
>       common code segments across different binaries
>     * rename sysconfig.c to lattice-sysconfig.c
>     * rename sysconfig.h to lattice-sysconfig.h
>     * rename sysconfig-spi.c to lattice-sysconfig-spi.c
>     * rename sysconfig_spi_cmd_write_then_read() to
>       sysconfig_spi_cmd_read()
>     * rename command_write_then_read() callback to command_read()
>     * rename sysconfig_cmd_write_then_read() to sysconfig_cmd_read()
>     * rename sysconfig_spi_lsc_burst_init() to
>       sysconfig_spi_bitstream_burst_init()
>     * rename sysconfig_spi_lsc_burst_complete() to
>       sysconfig_spi_bitstream_burst_complete()
>     * remove excessive !spi check from sysconfig_spi_cmd_write(),
>       sysconfig_spi_cmd_read(), sysconfig_spi_bitstream_burst_init(),
>       sysconfig_spi_bitstream_burst_write() and
>       sysconfig_spi_bitstream_burst_complete()
>     * drop MachXO2 support
>         ** drop struct sysconfig_fpga_priv
>         ** drop paged write
>         ** drop command_write_with_data() and friends
>         ** drop ISC_PROGRAM_DONE routine
>         ** drop refresh from sysconfig_isc_finish()
>         ** sysconfig_isc_erase() only erase SRAM
> 	** drop MachXO2 mentions from DT bindings doc
>   v12 -> v13:
>     * use device_get_match_data() instead of of_device_get_match_data()
>       and drop of_device.h inclusion
>     * in polling routines use time_before(jiffies, timeout) instead of
>       retries count
>     * add usleep_range() to gpio polling routine
>     * check fail status of command in more pronounced way
>     * check definition of sysconfig_priv callbacks at probe
>     * (BIT(23) | BIT(24) | BIT(25)) -> GENMASK(25, 23)
> 
> Ivan Bornyakov (2):
>   fpga: lattice-sysconfig-spi: add Lattice sysCONFIG FPGA manager
>   dt-bindings: fpga: document Lattice sysCONFIG FPGA manager
> 
>  .../bindings/fpga/lattice,sysconfig.yaml      |  81 ++++
>  drivers/fpga/Kconfig                          |  11 +
>  drivers/fpga/Makefile                         |   2 +
>  drivers/fpga/lattice-sysconfig-spi.c          | 151 ++++++
>  drivers/fpga/lattice-sysconfig.c              | 428 ++++++++++++++++++
>  drivers/fpga/lattice-sysconfig.h              |  41 ++
>  6 files changed, 714 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml
>  create mode 100644 drivers/fpga/lattice-sysconfig-spi.c
>  create mode 100644 drivers/fpga/lattice-sysconfig.c
>  create mode 100644 drivers/fpga/lattice-sysconfig.h
> 
> -- 
> 2.37.3
> 

Friendly ping.