[PATCH 0/4] spi: bcm2835aux: auxiliary spi improvements

stephanolbrich at gmx.de stephanolbrich at gmx.de
Tue Feb 9 10:10:31 PST 2016

From: Stephan Olbrich <stephanolbrich at gmx.de>

This patch series has some improvements and fixes for the auxiliary spi.

1. fix bitmask defines
 just fixes a typo (needed in 2.)

2. disable tx fifo empty irq
 reduces the numer of interrupts with nothing to do

3. set up spi-mode before asserting cs-gpio
 As Martin Sperl suggested this is done in the same way as in spi-bcm2835.c

4. fix CPOL/CPHA setting
 From what I've seen in the documentation [1] and seen on the scope this chip
 doesn't support modes with CPHA=1. With this patch spi mode 0 and 2 should
 work correctly whereas mode 1 and 3 do not. 

[1] https://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

Stephan Olbrich (4):
  spi: bcm2835aux: fix bitmask defines
  spi: bcm2835aux: disable tx fifo empty irq
  spi: bcm2835aux: set up spi-mode before asserting cs-gpio
  spi: bcm2835aux: fix CPOL/CPHA setting

 drivers/spi/spi-bcm2835aux.c | 64 +++++++++++++++++++++++++++++++-------------
 1 file changed, 46 insertions(+), 18 deletions(-)


More information about the linux-rpi-kernel mailing list