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7d7aa2fd92
This change makes the names of Broadcom targets consistent by using the common notation based on SoC/CPU ID (which is used internally anyway), bcmXXXX instead of brcmXXXX. This is even used for target TITLE in make menuconfig already, only the short target name used brcm so far. Despite, since subtargets range from bcm2708 to bcm2711, it seems appropriate to use bcm27xx instead of bcm2708 (again, as already done for BOARDNAME). This also renames the packages brcm2708-userland and brcm2708-gpu-fw. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de> Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
81 lines
2.5 KiB
Diff
81 lines
2.5 KiB
Diff
From 61ca6adb1fc93622bb85acc18b6ce4f620c8c690 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Wed, 24 Jun 2015 14:10:44 +0100
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Subject: [PATCH] spi-bcm2835: Support pin groups other than 7-11
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The spi-bcm2835 driver automatically uses GPIO chip-selects due to
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some unreliability of the native ones. In doing so it chooses the
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same pins as the native chip-selects would use, but the existing
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code always uses pins 7 and 8, wherever the SPI function is mapped.
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Search the pinctrl group assigned to the driver for pins that
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correspond to native chip-selects, and use those for GPIO chip-
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selects.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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drivers/spi/spi-bcm2835.c | 45 ++++++++++++++++++++++++++++++++-------
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1 file changed, 37 insertions(+), 8 deletions(-)
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--- a/drivers/spi/spi-bcm2835.c
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+++ b/drivers/spi/spi-bcm2835.c
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@@ -687,6 +687,8 @@ static int bcm2835_spi_setup(struct spi_
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{
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int err;
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struct gpio_chip *chip;
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+ struct device_node *pins;
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+ u32 pingroup_index;
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/*
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* sanity checking the native-chipselects
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*/
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@@ -703,15 +705,42 @@ static int bcm2835_spi_setup(struct spi_
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"setup: only two native chip-selects are supported\n");
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return -EINVAL;
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}
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- /* now translate native cs to GPIO */
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- /* get the gpio chip for the base */
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- chip = gpiochip_find("pinctrl-bcm2835", chip_match_name);
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- if (!chip)
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- return 0;
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+ /* now translate native cs to GPIO */
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+ /* first look for chip select pins in the devices pin groups */
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+ for (pingroup_index = 0;
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+ (pins = of_parse_phandle(spi->master->dev.of_node,
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+ "pinctrl-0",
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+ pingroup_index)) != 0;
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+ pingroup_index++) {
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+ u32 pin;
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+ u32 pin_index;
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+ for (pin_index = 0;
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+ of_property_read_u32_index(pins,
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+ "brcm,pins",
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+ pin_index,
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+ &pin) == 0;
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+ pin_index++) {
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+ if (((spi->chip_select == 0) &&
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+ ((pin == 8) || (pin == 36) || (pin == 46))) ||
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+ ((spi->chip_select == 1) &&
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+ ((pin == 7) || (pin == 35)))) {
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+ spi->cs_gpio = pin;
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+ break;
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+ }
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+ }
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+ of_node_put(pins);
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+ }
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+ /* if that fails, assume GPIOs 7-11 are used */
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+ if (!gpio_is_valid(spi->cs_gpio) ) {
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+ /* get the gpio chip for the base */
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+ chip = gpiochip_find("pinctrl-bcm2835", chip_match_name);
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+ if (!chip)
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+ return 0;
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- /* and calculate the real CS */
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- spi->cs_gpio = chip->base + 8 - spi->chip_select;
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+ /* and calculate the real CS */
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+ spi->cs_gpio = chip->base + 8 - spi->chip_select;
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+ }
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/* and set up the "mode" and level */
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dev_info(&spi->dev, "setting up native-CS%i as GPIO %i\n",
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