RPI kernel 4.19 support

root/target/linux/brcm2708/patches-4.19/0012-spi-bcm2835-Disable-forced-software-CS.patch

@@ -0,0 +1,39 @@
+From 874dfddbc5d590a74738efc6a211a8fab0660d08 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Fri, 1 Jul 2016 22:09:24 +0100
+Subject: [PATCH 012/432] 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(+)
+
+diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
+index 23ec074b1fb6..f9f9bf7d0df8 100644
+--- a/drivers/spi/spi-bcm2835.c
++++ b/drivers/spi/spi-bcm2835.c
+@@ -705,6 +705,7 @@ 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;
+@@ -754,6 +755,7 @@ static int bcm2835_spi_setup(struct spi_device *spi)
+ 			spi->chip_select, spi->cs_gpio, err);
+ 		return err;
+ 	}
++#endif
+ 
+ 	return 0;
+ }
+-- 
+2.19.1
+