brcm2708: add linux 4.19 support

Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709)

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.19/950-0012-spi-bcm2835-Disable-forced-software-CS.patch b/target/linux/brcm2708/patches-4.19/950-0012-spi-bcm2835-Disable-forced-software-CS.patch
new file mode 100644
index 0000000000..091ede137d
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0012-spi-bcm2835-Disable-forced-software-CS.patch
@@ -0,0 +1,34 @@
+From 8d654c03c8e0730e67fc4e7d6435da05ddf4e284 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Fri, 1 Jul 2016 22:09:24 +0100
+Subject: [PATCH 012/703] 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>
+---
+ drivers/spi/spi-bcm2835.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/spi/spi-bcm2835.c
++++ b/drivers/spi/spi-bcm2835.c
+@@ -705,6 +705,7 @@ 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;
+@@ -754,6 +755,7 @@ static int bcm2835_spi_setup(struct spi_
+ 			spi->chip_select, spi->cs_gpio, err);
+ 		return err;
+ 	}
++#endif
+ 
+ 	return 0;
+ }