brcm2708: rename all patches from raspberrypi git tree to use 950 prefix

Right now all brcm2708 patches are extracted from the non-mainline
raspberrypi/linux git tree. Many of them are hacks and/or are unneeded
in LEDE. Raspberry Pi is getting better and better mainline support so
it would be nice to finally start maintaining patches in a cleaner way:
1) Backport patches accepted in upstream tree
2) Start using upstream drivers
3) Pick only these patches that are needed for more complete support

Handling above tasks requires grouping patches - ideally using the same
prefixes as generic ones. It means we should rename existing patches to
use some high prefix. This will allow e.g. use 0xx for backported code.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Stijn Tintel <stijn@linux-ipv6.be>

1 files changed, 80 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.9/950-0015-spi-bcm2835-Support-pin-groups-other-than-7-11.patch b/target/linux/brcm2708/patches-4.9/950-0015-spi-bcm2835-Support-pin-groups-other-than-7-11.patch
new file mode 100644
index 0000000000..62145a2f07
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.9/950-0015-spi-bcm2835-Support-pin-groups-other-than-7-11.patch
@@ -0,0 +1,80 @@
+From 6603973d0897c1a9b3b1a813c8ab1204efe98fe0 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Wed, 24 Jun 2015 14:10:44 +0100
+Subject: [PATCH] spi-bcm2835: Support pin groups other than 7-11
+
+The spi-bcm2835 driver automatically uses GPIO chip-selects due to
+some unreliability of the native ones. In doing so it chooses the
+same pins as the native chip-selects would use, but the existing
+code always uses pins 7 and 8, wherever the SPI function is mapped.
+
+Search the pinctrl group assigned to the driver for pins that
+correspond to native chip-selects, and use those for GPIO chip-
+selects.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/spi/spi-bcm2835.c | 45 +++++++++++++++++++++++++++++++++++++--------
+ 1 file changed, 37 insertions(+), 8 deletions(-)
+
+--- a/drivers/spi/spi-bcm2835.c
++++ b/drivers/spi/spi-bcm2835.c
+@@ -688,6 +688,8 @@ static int bcm2835_spi_setup(struct spi_
+ {
+ 	int err;
+ 	struct gpio_chip *chip;
++	struct device_node *pins;
++	u32 pingroup_index;
+ 	/*
+ 	 * sanity checking the native-chipselects
+ 	 */
+@@ -704,15 +706,42 @@ static int bcm2835_spi_setup(struct spi_
+ 			"setup: only two native chip-selects are supported\n");
+ 		return -EINVAL;
+ 	}
+-	/* now translate native cs to GPIO */
+ 
+-	/* get the gpio chip for the base */
+-	chip = gpiochip_find("pinctrl-bcm2835", chip_match_name);
+-	if (!chip)
+-		return 0;
++	/* now translate native cs to GPIO */
++	/* first look for chip select pins in the devices pin groups */
++	for (pingroup_index = 0;
++	     (pins = of_parse_phandle(spi->master->dev.of_node,
++				     "pinctrl-0",
++				      pingroup_index)) != 0;
++	     pingroup_index++) {
++		u32 pin;
++		u32 pin_index;
++		for (pin_index = 0;
++		     of_property_read_u32_index(pins,
++						"brcm,pins",
++						pin_index,
++						&pin) == 0;
++		     pin_index++) {
++			if (((spi->chip_select == 0) &&
++			     ((pin == 8) || (pin == 36) || (pin == 46))) ||
++			    ((spi->chip_select == 1) &&
++			     ((pin == 7) || (pin == 35)))) {
++				spi->cs_gpio = pin;
++				break;
++			}
++		}
++		of_node_put(pins);
++	}
++	/* if that fails, assume GPIOs 7-11 are used */
++	if (!gpio_is_valid(spi->cs_gpio) ) {
++		/* get the gpio chip for the base */
++		chip = gpiochip_find("pinctrl-bcm2835", chip_match_name);
++		if (!chip)
++			return 0;
+ 
+-	/* and calculate the real CS */
+-	spi->cs_gpio = chip->base + 8 - spi->chip_select;
++		/* and calculate the real CS */
++		spi->cs_gpio = chip->base + 8 - spi->chip_select;
++	}
+ 
+ 	/* and set up the "mode" and level */
+ 	dev_info(&spi->dev, "setting up native-CS%i as GPIO %i\n",