[PATCH resend 0/5] spi: mpc8xxx_spi: bug fixes, real ->set_speed and a pseudo-gpio driver

Rasmus Villemoes rasmus.villemoes at prevas.dk
Tue Feb 11 16:20:21 CET 2020

This is a combination of a single patch and a 4-part series sent
previously [1,2], this time with Jagan on Cc.

Patch 1 is a convenient pseudo-gpio driver for controlling a single
output signal on mpc830x. Since it's (usually) used as a chip select,
representing it as a gpio (without the gp or i) makes it simple to use
in device tree.

The remaining four fix bugs in the mpc8xxx_spi driver, most
importantly patch 4. Without it, reads and writes of certain lengths
from spi-nor fails, and stuff at physical address 0x0 gets overwritten
even if no input buffer is supplied (e.g. when sending a command).

Tested on an mpc8309-derived board. It would be nice if someone with
access to the gazerbeam board can test that this doesn't break that -
in particular, the "only do transfers that are multiple of 8 bits"

[1] https://patchwork.ozlabs.org/patch/1219513/
[2] https://patchwork.ozlabs.org/cover/1218170/

Klaus H. Sorensen (1):
  gpio/mpc83xx_spisel_boot.c: gpio driver for SPISEL_BOOT signal

Rasmus Villemoes (4):
  gazerbeam: add clocks property to SPI node
  mpc8xxx_spi: put max_cs to use
  mpc8xxx_spi: always use 8-bit characters, don't read or write garbage
  mpc8xxx_spi: implement real ->set_speed

 arch/powerpc/dts/gdsys/mpc8308.dtsi           |   7 +
 .../gpio/fsl,mpc83xx-spisel-boot.txt          |  22 +++
 drivers/gpio/Kconfig                          |   8 +
 drivers/gpio/Makefile                         |   1 +
 drivers/gpio/mpc83xx_spisel_boot.c            | 148 ++++++++++++++++++
 drivers/spi/mpc8xxx_spi.c                     | 141 ++++++++++-------
 6 files changed, 267 insertions(+), 60 deletions(-)
 create mode 100644 doc/device-tree-bindings/gpio/fsl,mpc83xx-spisel-boot.txt
 create mode 100644 drivers/gpio/mpc83xx_spisel_boot.c


More information about the U-Boot mailing list