[PATCH 00/21] spi: s3c64xx: winter cleanup and gs101 support

[Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>]

Hi,

The patch set cleans a bit the driver and adds support for gs101 SPI.

Apart of the SPI patches, I added support for iowrite{8,16}_32 accessors
in asm-generic/io.h. This will allow devices that require 32 bits
register accesses to write data in chunks of 8 or 16 bits (a typical use
case is SPI, where clients can request transfers in words of 8 bits for
example). GS101 only allows 32bit register accesses otherwise it raisses
a Serror Interrupt and hangs the system, thus the accessors are needed
here. If the accessors are fine, I expect they'll be queued either to
the SPI tree or to the ASM header files tree, but by providing an
immutable tag, so that the other tree can merge them too.

The SPI patches were tested with the spi-loopback-test on the gs101
controller.

Thanks!
ta

Tudor Ambarus (21):
  spi: dt-bindings: samsung: add google,gs101-spi compatible
  spi: s3c64xx: sort headers alphabetically
  spi: s3c64xx: remove extra blank line
  spi: s3c64xx: remove unneeded (void *) casts in of_match_table
  spi: s3c64xx: explicitly include <linux/bits.h>
  spi: s3c64xx: remove else after return
  spi: s3c64xx: use bitfield access macros
  spi: s3c64xx: move error check up to avoid rechecking
  spi: s3c64xx: use full mask for {RX, TX}_FIFO_LVL
  spi: s3c64xx: move common code outside if else
  spi: s3c64xx: check return code of dmaengine_slave_config()
  spi: s3c64xx: propagate the dma_submit_error() error code
  spi: s3c64xx: rename prepare_dma() to s3c64xx_prepare_dma()
  spi: s3c64xx: return ETIMEDOUT for wait_for_completion_timeout()
  spi: s3c64xx: simplify s3c64xx_wait_for_pio()
  spi: s3c64xx: add missing blank line after declaration
  spi: s3c64xx: downgrade dev_warn to dev_dbg for optional dt props
  asm-generic/io.h: add iowrite{8,16}_32 accessors
  spi: s3c64xx: add support for google,gs101-spi
  spi: s3c64xx: make the SPI alias optional for newer SoCs
  MAINTAINERS: add Tudor Ambarus as R for the samsung SPI driver

 .../devicetree/bindings/spi/samsung,spi.yaml  |   1 +
 MAINTAINERS                                   |   1 +
 drivers/spi/spi-s3c64xx.c                     | 447 +++++++++---------
 include/asm-generic/io.h                      |  50 ++
 4 files changed, 276 insertions(+), 223 deletions(-)

-- 
2.43.0.429.g432eaa2c6b-goog