summaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.1/0099-spi-bcm2835-Support-pin-groups-other-than-7-11.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0099-spi-bcm2835-Support-pin-groups-other-than-7-11.patch')
-rw-r--r--target/linux/brcm2708/patches-4.1/0099-spi-bcm2835-Support-pin-groups-other-than-7-11.patch80
1 files changed, 0 insertions, 80 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0099-spi-bcm2835-Support-pin-groups-other-than-7-11.patch b/target/linux/brcm2708/patches-4.1/0099-spi-bcm2835-Support-pin-groups-other-than-7-11.patch
deleted file mode 100644
index 2577571d6e..0000000000
--- a/target/linux/brcm2708/patches-4.1/0099-spi-bcm2835-Support-pin-groups-other-than-7-11.patch
+++ /dev/null
@@ -1,80 +0,0 @@
-From 335b089500be59c664c88ac0ca62d3205e68a5ee Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Wed, 24 Jun 2015 14:10:44 +0100
-Subject: [PATCH 099/222] 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
-@@ -376,6 +376,8 @@ 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
- */
-@@ -392,15 +394,42 @@ 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",