Add support to the FPGA manager for programming Lattice FPGAs over slave SPI sysCONFIG interface. ECP5 and MachXO2 are supported. WARNING: I only have HW with ECP5, so can't vouch for the MachXO2. MachXO2's support is based on existing machxo2-spi.c and publicly available documentation, it's not tested on real hardware. 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 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 | 102 +++++ drivers/fpga/Kconfig | 7 + drivers/fpga/Makefile | 3 + drivers/fpga/sysconfig-spi.c | 216 +++++++++ drivers/fpga/sysconfig.c | 433 ++++++++++++++++++ drivers/fpga/sysconfig.h | 67 +++ 6 files changed, 828 insertions(+) create mode 100644 Documentation/devicetree/bindings/fpga/lattice,sysconfig.yaml create mode 100644 drivers/fpga/sysconfig-spi.c create mode 100644 drivers/fpga/sysconfig.c create mode 100644 drivers/fpga/sysconfig.h -- 2.37.2