target/linux/brcm2708/patches-4.19/950-0011-spi-bcm2835-Disable-forced-software-CS.patch

   1 From 2610aceda837370048f86b4af27852463c3b5a47 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 1 Jul 2016 22:09:24 +0100
   4 Subject: [PATCH] spi-bcm2835: Disable forced software CS
   5
   6 Select software CS in bcm2708_common.dtsi, and disable the automatic
   7 conversion in the driver to allow hardware CS to be re-enabled with an
   8 overlay.
   9
  10 See: https://github.com/raspberrypi/linux/issues/1547
  11
  12 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  13 ---
  14  drivers/spi/spi-bcm2835.c | 2 ++
  15  1 file changed, 2 insertions(+)
  16
  17 --- a/drivers/spi/spi-bcm2835.c
  18 +++ b/drivers/spi/spi-bcm2835.c
  19 @@ -706,6 +706,7 @@ static int bcm2835_spi_setup(struct spi_
  20                 return -EINVAL;
  21         }
  22
  23 +#if 0
  24         /* now translate native cs to GPIO */
  25         /* first look for chip select pins in the devices pin groups */
  26         for (pingroup_index = 0;
  27 @@ -755,6 +756,7 @@ static int bcm2835_spi_setup(struct spi_
  28                         spi->chip_select, spi->cs_gpio, err);
  29                 return err;
  30         }
  31 +#endif
  32
  33         return 0;
  34  }