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- From ca5ffeeb576e6392ed1331f01fb2ac5be4524d24 Mon Sep 17 00:00:00 2001
- From: Phil Elwell <phil@raspberrypi.org>
- Date: Fri, 1 Jul 2016 22:09:24 +0100
- Subject: [PATCH] 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>
- ---
- arch/arm/boot/dts/bcm2708_common.dtsi | 2 +-
- drivers/spi/spi-bcm2835.c | 2 ++
- 2 files changed, 3 insertions(+), 1 deletion(-)
- --- a/arch/arm/boot/dts/bcm2708_common.dtsi
- +++ b/arch/arm/boot/dts/bcm2708_common.dtsi
- @@ -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 {
- --- a/drivers/spi/spi-bcm2835.c
- +++ b/drivers/spi/spi-bcm2835.c
- @@ -706,6 +706,7 @@ static int bcm2835_spi_setup(struct 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;
- @@ -760,6 +761,7 @@ static int bcm2835_spi_setup(struct spi_
- * so we are setting it here explicitly
- */
- gpio_set_value(spi->cs_gpio, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
- +#endif
-
- return 0;
- }
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