diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0135-spi-spi-bcm2835-Disable-forced-software-CS.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0135-spi-spi-bcm2835-Disable-forced-software-CS.patch | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0135-spi-spi-bcm2835-Disable-forced-software-CS.patch b/target/linux/bcm27xx/patches-5.4/950-0135-spi-spi-bcm2835-Disable-forced-software-CS.patch new file mode 100644 index 0000000000..92b2378571 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0135-spi-spi-bcm2835-Disable-forced-software-CS.patch @@ -0,0 +1,59 @@ +From dc1e3fefce7abd7532fbc74e26df61a8ced1dcd6 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Tue, 15 Jan 2019 12:41:15 +0000 +Subject: [PATCH] spi: spi-bcm2835: Disable forced software CS + +With GPIO CS used by the DTBs, allow hardware CS to be selected by an +overlay. + +Signed-off-by: Phil Elwell <phil@raspberrypi.org> +--- + drivers/spi/spi-bcm2835.c | 37 ------------------------------------- + 1 file changed, 37 deletions(-) + +--- a/drivers/spi/spi-bcm2835.c ++++ b/drivers/spi/spi-bcm2835.c +@@ -1279,43 +1279,6 @@ static int bcm2835_spi_setup(struct spi_ + return -EINVAL; + } + +- /* +- * Translate native CS to GPIO +- * +- * FIXME: poking around in the gpiolib internals like this is +- * not very good practice. Find a way to locate the real problem +- * and fix it. Why is the GPIO descriptor in spi->cs_gpiod +- * sometimes not assigned correctly? Erroneous device trees? +- */ +- +- /* get the gpio chip for the base */ +- chip = gpiochip_find("pinctrl-bcm2835", chip_match_name); +- if (!chip) +- return 0; +- +- /* +- * Retrieve the corresponding GPIO line used for CS. +- * The inversion semantics will be handled by the GPIO core +- * code, so we pass GPIOS_OUT_LOW for "unasserted" and +- * the correct flag for inversion semantics. The SPI_CS_HIGH +- * on spi->mode cannot be checked for polarity in this case +- * as the flag use_gpio_descriptors enforces SPI_CS_HIGH. +- */ +- if (of_property_read_bool(spi->dev.of_node, "spi-cs-high")) +- lflags = GPIO_ACTIVE_HIGH; +- else +- lflags = GPIO_ACTIVE_LOW; +- spi->cs_gpiod = gpiochip_request_own_desc(chip, 8 - spi->chip_select, +- DRV_NAME, +- lflags, +- GPIOD_OUT_LOW); +- if (IS_ERR(spi->cs_gpiod)) +- return PTR_ERR(spi->cs_gpiod); +- +- /* and set up the "mode" and level */ +- dev_info(&spi->dev, "setting up native-CS%i to use GPIO\n", +- spi->chip_select); +- + return 0; + } + |