diff --git a/target/linux/ath79/patches-5.10/412-spi-ath79-set-number-of-chipselect-lines.patch b/target/linux/ath79/patches-5.10/412-spi-ath79-set-number-of-chipselect-lines.patch
new file mode 100644
index 00000000000..614bcbcded3
--- /dev/null
+++ b/target/linux/ath79/patches-5.10/412-spi-ath79-set-number-of-chipselect-lines.patch
@@ -0,0 +1,26 @@
+From e2e9f6d9f9bd7449ff113c157b639ce1a24b9d3f Mon Sep 17 00:00:00 2001
+From: David Bauer <mail@david-bauer.net>
+Date: Sat, 24 Apr 2021 16:14:48 +0200
+Subject: [PATCH 2/2] spi: ath79: set number of chipselect lines
+
+All chipsets from AR7100 up to QCA9563 have three dedicated chipselect
+lines for the integrated SPI controller. Remove the number of
+chipselects from the platform data, as there is no need to manually set
+this to a different value.
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+---
+ drivers/spi/spi-ath79.c                 | 2 +-
+ include/linux/platform_data/spi-ath79.h | 1 -
+ 2 files changed, 1 insertion(+), 2 deletions(-)
+
+--- a/drivers/spi/spi-ath79.c
++++ b/drivers/spi/spi-ath79.c
+@@ -187,6 +187,7 @@ static int ath79_spi_probe(struct platfo
+ 	master->use_gpio_descriptors = true;
+ 	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
+ 	master->flags = SPI_MASTER_GPIO_SS;
++	master->num_chipselect = 3;
+ 
+ 	sp->bitbang.master = master;
+ 	sp->bitbang.chipselect = ath79_spi_chipselect;