diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0595-spi-bcm2835-Increase-the-CS-limit-to-24.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0595-spi-bcm2835-Increase-the-CS-limit-to-24.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0595-spi-bcm2835-Increase-the-CS-limit-to-24.patch b/target/linux/bcm27xx/patches-5.10/950-0595-spi-bcm2835-Increase-the-CS-limit-to-24.patch new file mode 100644 index 0000000000..0d4573430e --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0595-spi-bcm2835-Increase-the-CS-limit-to-24.patch @@ -0,0 +1,38 @@ +From c3fbb1e6771dabb14571552c036a049ffa470eb1 Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.com> +Date: Fri, 30 Apr 2021 08:34:36 +0100 +Subject: [PATCH] spi: bcm2835: Increase the CS limit to 24 + +Increase the maximum number of CS lines to 24, and ensure this limit is +not exceeded. + +See: https://github.com/raspberrypi/linux/pull/4281 + +Suggested-by: Joe Burmeister <joe.burmeister@devtank.co.uk> +Signed-off-by: Phil Elwell <phil@raspberrypi.com> +--- + drivers/spi/spi-bcm2835.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +--- a/drivers/spi/spi-bcm2835.c ++++ b/drivers/spi/spi-bcm2835.c +@@ -28,6 +28,7 @@ + #include <linux/gpio/consumer.h> + #include <linux/gpio/machine.h> /* FIXME: using chip internals */ + #include <linux/gpio/driver.h> /* FIXME: using chip internals */ ++#include <linux/of_gpio.h> + #include <linux/of_irq.h> + #include <linux/spi/spi.h> + +@@ -1299,6 +1300,11 @@ static int bcm2835_spi_probe(struct plat + struct bcm2835_spi *bs; + int err; + ++ if (of_gpio_named_count(pdev->dev.of_node, "cs-gpios") > ++ BCM2835_SPI_NUM_CS) ++ return dev_err_probe(&pdev->dev, -EINVAL, ++ "too many chip selects\n"); ++ + ctlr = devm_spi_alloc_master(&pdev->dev, ALIGN(sizeof(*bs), + dma_get_cache_alignment())); + if (!ctlr) |