This series adds support for SPI on the Kendryte K210. This covers the MMC slot (currently broken) and SPI flash on the Sipeed Maix Bit.
This series makes significant changes to the designware SPI driver. I would really appreciate if the maintainers I CC'd could test this series and ensure that SPI still works on all their devices. I have tried my best not to affect existing devices, but I'd rather find out if this breaks stuff now rather than later.
In particular:
Ley Foon Tan, can you try using dw_spi_dw32_init with the Stratix 10 and Agilex SoCFPGAs? From their documentation, it is unclear whether one should use the DFS or DFS_32 field. I have used dw_spi_dw16_init for these devices, since that keeps the same behavior as before this series, but I am interested in seeing whether the DFS_32 works.
Gregory Clement, Lars Povlsen, and Horatiu Vultur, can you confirm the register layout of ctrlr0 and version of the device on the MSCC Ocelot and Jaguar 2? I couldn't find any documentation for the device on those SoCs online.
Alexey Brodkin and Eugeniy Paltsev, can you confirm the register layout of ctrlr0 and version of the device on ARC SoCs? I couldn't find any documentation for the device on those SoCs online. In addition, can you clarify the nature of SSI_MAX_XFER_SIZE? Is it set once before the device is fabricated, or is it set at runtime? Is there any way to detect it at runtime? Is my supposition that it was introduced in version 3.23 correct? Have there been any other breaking changes which I have overlooked? I tried investigating some of this, but I was unable to find any definitive ruling on the matter. All I could find was this forum post which doesn't really explain anything [1].
[1] https://community.intel.com/t5/Intel-Makers/D2000-SPI-word-frame-size/td-p/2...
This series was previously part of https://patchwork.ozlabs.org/project/uboot/list/?series=161576
This series depends on https://patchwork.ozlabs.org/project/uboot/list/?series=185489
Known bugs: - The MMC cannot be accessed with the dw_spi driver
Changes in v2: - Add Gigadevice SPI chips to dependencies - Add external gpio cs support - Clean up exec_op - Configure ctrlr0 register layout based on compatible string - Convert debug calls to log_ instead of removing the ones which affect timing - Document new compatible strings - Limit data transfers to 64k - Remove broken-wp property (implicit due to no wp gpio) - Remove ctrl0 field offsets from device tree - Switch to new compatible strings - Switch to new pinmux binding style
Sean Anderson (10): spi: dw: Convert calls to debug to log_* spi: dw: Rename "cs-gpio" to "cs-gpios" spi: dw: Use generic function to read reg address spi: dw: Rearrange struct dw_spi_priv spi: dw: Add SoC-specific compatible strings spi: dw: Configure ctrlr0 layout based on compatible string spi: dw: Document devicetree binding spi: dw: Add mem_ops riscv: Add device tree bindings for SPI riscv: Add support for SPI on Kendryte K210
arch/arc/dts/axs10x_mb.dtsi | 5 +- arch/arc/dts/hsdk-common.dtsi | 5 +- arch/arm/dts/socfpga.dtsi | 6 +- arch/arm/dts/socfpga_agilex.dtsi | 6 +- arch/arm/dts/socfpga_arria10.dtsi | 6 +- arch/arm/dts/socfpga_stratix10.dtsi | 6 +- arch/mips/dts/mscc,jr2.dtsi | 2 +- arch/mips/dts/mscc,ocelot.dtsi | 2 +- arch/riscv/dts/k210-maix-bit.dts | 46 ++- arch/riscv/dts/k210.dtsi | 15 +- board/sipeed/maix/Kconfig | 11 + configs/sipeed_maix_bitm_defconfig | 8 + doc/board/sipeed/maix.rst | 94 +++-- .../spi/snps,dw-apb-ssi.txt | 56 +++ drivers/spi/designware_spi.c | 381 ++++++++++++++---- 15 files changed, 528 insertions(+), 121 deletions(-) create mode 100644 doc/device-tree-bindings/spi/snps,dw-apb-ssi.txt