2016-12-02 10:50:26 +00:00
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From ca5ffeeb576e6392ed1331f01fb2ac5be4524d24 Mon Sep 17 00:00:00 2001
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2016-07-07 07:22:07 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 1 Jul 2016 22:09:24 +0100
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] spi-bcm2835: Disable forced software CS
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2016-07-07 07:22:07 +00:00
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Select software CS in bcm2708_common.dtsi, and disable the automatic
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conversion in the driver to allow hardware CS to be re-enabled with an
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overlay.
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See: https://github.com/raspberrypi/linux/issues/1547
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/bcm2708_common.dtsi | 2 +-
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drivers/spi/spi-bcm2835.c | 2 ++
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2 files changed, 3 insertions(+), 1 deletion(-)
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--- a/arch/arm/boot/dts/bcm2708_common.dtsi
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+++ b/arch/arm/boot/dts/bcm2708_common.dtsi
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@@ -183,7 +183,7 @@
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* add more gpios if necessary as <&gpio 6 1>
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* (but do not forget to make them output!)
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*/
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- cs-gpios = <0>, <0>;
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+ cs-gpios = <&gpio 8 1>, <&gpio 7 1>;
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};
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i2c0: i2c@7e205000 {
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--- a/drivers/spi/spi-bcm2835.c
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+++ b/drivers/spi/spi-bcm2835.c
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@@ -707,6 +707,7 @@ static int bcm2835_spi_setup(struct spi_
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return -EINVAL;
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}
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+#if 0
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/* now translate native cs to GPIO */
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/* first look for chip select pins in the devices pin groups */
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for (pingroup_index = 0;
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@@ -761,6 +762,7 @@ static int bcm2835_spi_setup(struct spi_
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* so we are setting it here explicitly
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*/
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gpio_set_value(spi->cs_gpio, (spi->mode & SPI_CS_HIGH) ? 0 : 1);
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+#endif
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return 0;
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}
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