This series adds support for the SPI controller found in the SpacemiT
K1 SoC. The driver currently supports only master mode. The controller
has two 32-entry FIFOs and supports PIO and DMA for transfers.
Version 6 is identical to version 5, other than being rebased onto
a current linux-next/master.
-Alex
This series is available here:
https://github.com/riscstar/linux/tree/outgoing/spi-v6
Between version 5 and version 6:
- Rebase only
Here is version 5 of this series:
https://lore.kernel.org/lkml/20251013123309.2252042-1-elder@riscstar.com/
Between version 4 and version 5:
- Added Yixun's Reviewed-by tag on patch 3
Here is version 4 of this series:
https://lore.kernel.org/lkml/20250925121714.2514932-1-elder@riscstar.com/
Between version 3 and version 4 (all suggested by Yixun):
- Fixed an underrun/overrun comment error
- Renamed a pinctrl node
- Formatted dmas and dma-names properties on one line
Here is version 3 of this series:
https://lore.kernel.org/lkml/20250922161717.1590690-1-elder@riscstar.com/
Between version 2 and version 3:
- Add Conor's Acked-by to patch 1
- Add Rob's Reviewed-by to patch 1
- Added imply_PDMA to the SPI_SPACEMIT_K1 Kconfig option
- Fixed a bug pointed out by Vivian (and Troy) in word-sized reads
- Added a comment stating we use 1, 2, or 4 bytes per word
- Cleaned up DMA channels properly in case of failure setting up
- No longer use devm_*() for allocating DMA channels or buffer
- Moved the SPI controller into the dma-bus memory region
Here is version 2 of this series:
https://lore.kernel.org/lkml/20250919155914.935608-1-elder@riscstar.com/
Between version 1 and version 2:
- Use enum rather than const for the binding compatible string
- Omit the label and status property in the binding example
- The spi-spacemit-k1.o make target is now added in sorted order
- The SPI_SPACEMIT_K1 config option is added in sorted order
- The SPI_SPACEMIT_K1 config does *not* depend on MMP_PDMA,
however MMP_PDMA is checked at runtime, and if not enabled,
DMA will not be used
- Read/modify/writes of registers no longer use an additional
"virt" variable to hold the address accessed
- The k1_spi_driver_data->ioaddr field has been renamed base
- The DMA address for the base address is maintained, rather than
saving the DMA address of the data register
- The spi-max-frequency property value is now bounds checked
- A local variable is now initialized to 0 in k1_spi_write_word()
- The driver name is now "k1-spi"
- DT aliases are used rather than spacemit,k1-ssp-id for bus number
- The order of two pin control properties was changed as requested
- Clock names and DMA names are now on one line in the "k1.dtsi"
- The interrupts property is used rather than interrupts-extended
- The order of two pin control properties was changed as requested
- Clock names and DMA names are now on one line in the "k1.dtsi"
- The interrupts property is used rather than interrupts-extended
Here is version 1 of this series:
https://lore.kernel.org/lkml/20250917220724.288127-1-elder@riscstar.com/
Alex Elder (3):
dt-bindings: spi: add SpacemiT K1 SPI support
spi: spacemit: introduce SpacemiT K1 SPI controller driver
riscv: dts: spacemit: define a SPI controller node
.../bindings/spi/spacemit,k1-spi.yaml | 84 ++
.../boot/dts/spacemit/k1-bananapi-f3.dts | 15 +-
arch/riscv/boot/dts/spacemit/k1-pinctrl.dtsi | 20 +
arch/riscv/boot/dts/spacemit/k1.dtsi | 15 +
drivers/spi/Kconfig | 9 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-spacemit-k1.c | 965 ++++++++++++++++++
7 files changed, 1105 insertions(+), 4 deletions(-)
create mode 100644 Documentation/devicetree/bindings/spi/spacemit,k1-spi.yaml
create mode 100644 drivers/spi/spi-spacemit-k1.c
base-commit: 8fec172c82c2b5f6f8e47ab837c1dc91ee3d1b87
--
2.48.1