spi-bcm2835: Disable forced software CS

Select software CS in bcm2708_common.dtsi, and disable the automatic
conversion in the driver to allow hardware CS to be re-enabled with an
overlay.

See: https://github.com/raspberrypi/linux/issues/1547

Signed-off-by: Phil Elwell <phil@raspberrypi.org>

diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index 5dfe20ffc2866fa6789825016c585175a29705b6..8493474d286f7a1ac6454a22c61c8c2cef9121bf 100644 (file)
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -707,6 +707,7 @@ static int bcm2835_spi_setup(struct spi_device *spi)
                return -EINVAL;
        }
 
+#if 0
        /* now translate native cs to GPIO */
        /* first look for chip select pins in the devices pin groups */
        for (pingroup_index = 0;
@@ -756,6 +757,7 @@ static int bcm2835_spi_setup(struct spi_device *spi)
                        spi->chip_select, spi->cs_gpio, err);
                return err;
        }
+#endif
 
        return 0;
 }