The SC18IS606 is basically already supported by the driver, but since it
has a larger data buffer and fewer chip selects, it deserves its own
compatible string together with some minor modifications to the driver
to support this.

While at it, convert the device tree bindings to YAML before adding an
additional compatible string.

Signed-off-by: Alvin Šipraga <alsi@bang-olufsen.dk>
---
Alvin Šipraga (3):
      spi: dt-bindings: nxp,sc18is602: convert binding to YAML
      spi: dt-bindings: nxp,sc18is602: add compatible for SC18IS606
      spi: sc18is602: add support for SC18IS606

 .../devicetree/bindings/spi/nxp,sc18is602.yaml     | 60 ++++++++++++++++++++++
 .../devicetree/bindings/spi/spi-sc18is602.txt      | 23 ---------
 drivers/spi/spi-sc18is602.c                        | 29 ++++++++---
 3 files changed, 83 insertions(+), 29 deletions(-)
---
base-commit: 5343a65e03e4ee9f81508032e70b547e3c9f99ed
change-id: 20240423-sc18is606-d375613ebd82