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spi-bcm2835: Disable forced software CS

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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>
This commit is contained in:
Phil Elwell
2016-07-01 22:09:24 +01:00
parent 96994fca28
commit e68c1e6e6d
2 changed files with 3 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/boot/dts/bcm2708_common.dtsi
View File

@@ -183,7 +183,7 @@
* add more gpios if necessary as <&gpio 6 1>
* (but do not forget to make them output!)
*/
cs-gpios = <0>, <0>;
cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
};
i2c0: i2c@7e205000 {

2
drivers/spi/spi-bcm2835.c
View File

@@ -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;
@@ -761,6 +762,7 @@ static int bcm2835_spi_setup(struct spi_device *spi)
* so we are setting it here explicitly
*/
gpio_set_value(spi->cs_gpio, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
#endif
return 0;
}