diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0012-spi-bcm2835-Support-pin-groups-other-than-7-11.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0012-spi-bcm2835-Support-pin-groups-other-than-7-11.patch | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0012-spi-bcm2835-Support-pin-groups-other-than-7-11.patch b/target/linux/brcm2708/patches-4.4/0012-spi-bcm2835-Support-pin-groups-other-than-7-11.patch deleted file mode 100644 index 162a052adc..0000000000 --- a/target/linux/brcm2708/patches-4.4/0012-spi-bcm2835-Support-pin-groups-other-than-7-11.patch +++ /dev/null @@ -1,80 +0,0 @@ -From 24fb0aecbadfc9bc8ebfb0c836ef7379b8fc5888 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", |