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

[stephanolbrich at gmx.de]

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
 acace73df2c1913a526c1b41e4741a4a6704c863

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(-)

-- 
2.5.0