[0/3] Realtek SPI-NAND controller

Message

Chris Packham Oct. 6, 2024, 11:33 p.m. UTC

This series adds support for the SPI-NAND flash controller on the RTL9300
family of SoCs.

There are 2 physical chip selects which are called SPI_MST_CS0 and SPI_MST_CS1
in the datasheet. Via some pin-strapping these can be assigned to either the
SPI-NOR controller or the SPI-NAND controller. Which means you can end up with
the following permutations

  SPI-Flash
  Boot Model SPI_MST_CS0 SPI_MST_CS1
  ---------- ----------- -----------
  NOR x1     NOR-CS0     X
  NOR x2     NOR-CS0     NOR-CS1
  NAND x1    NAND-CS0    X
  NAND x2    NAND-CS0    NAND-CS1
  NOR+NAND   NOR-CS0     NAND-CS0

Chris Packham (3):
  dt-bindings: spi: Add realtek,rtl9300-snand
  mips: dts: realtek: Add SPI NAND controller
  spi: spi-mem: Add Realtek SPI-NAND controller

 .../bindings/spi/realtek,rtl9300-snand.yaml   |  58 +++
 MAINTAINERS                                   |   6 +
 arch/mips/boot/dts/realtek/rtl930x.dtsi       |  12 +
 drivers/spi/Kconfig                           |  11 +
 drivers/spi/Makefile                          |   1 +
 drivers/spi/spi-realtek-rtl-snand.c           | 408 ++++++++++++++++++
 6 files changed, 496 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/realtek,rtl9300-snand.yaml
 create mode 100644 drivers/spi/spi-realtek-rtl-snand.c