[v2,00/12] spi: s3c64xx: remove OF alias ID dependency

Message

Tudor Ambarus Feb. 12, 2024, 2:03 p.m. UTC

The driver was wrong as it assumed that the alias values in devicetree
have a particular meaning in identifying instances. This immediately
breaks when there is a dtb file that does not use the same alias values,
e.g. because it only needs some of the SPI ports.

Tested gs101 SPI with spi-loopback-test, all went fine. I updated
exynos850 as it uses the same USI.SPI_VERSION as gs101. Maybe Sam can
test exynos850, if not, we can drop that patch (12/12).

v2:
- update bindings to consider the asymmetric case where the RX FIFO
  depth can differ from the TX FIFO depth
- update commit message in patch 11/12 to describe the GS101 change
  (I was wrongly mentioning exynos 850). 


Tudor Ambarus (12):
  spi: dt-bindings: introduce FIFO depth properties
  spi: s3c64xx: define a magic value
  spi: s3c64xx: allow full FIFO masks
  spi: s3c64xx: determine the fifo depth only once
  spi: s3c64xx: retrieve the FIFO depth from the device tree
  spi: s3c64xx: allow FIFO depth to be determined from the compatible
  spi: s3c64xx: let the SPI core determine the bus number
  spi: s3c64xx: introduce s3c64xx_spi_set_port_id()
  spi: s3c64xx: get rid of the OF alias ID dependency
  spi: s3c64xx: deprecate fifo_lvl_mask, rx_lvl_offset and port_id
  spi: s3c64xx: switch gs101 to new port config data
  spi: s3c64xx: switch exynos850 to new port config data

 .../bindings/spi/spi-controller.yaml          |  27 ++++
 drivers/spi/spi-s3c64xx.c                     | 142 ++++++++++++++----
 2 files changed, 138 insertions(+), 31 deletions(-)