spi: cs42l43: Correct SPI root clock speed

[ Upstream commit 4eecb644b8b82f5279a348f6ebe77e3d6e5b1b05 ]

The root clock is actually 49.152MHz not 40MHz, as it is derived from
the primary audio clock, update the driver to match. This error can
cause the actual clock rate to be higher than the requested clock rate
on the SPI bus.

Fixes: ef75e767167a ("spi: cs42l43: Add SPI controller support")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://msgid.link/r/20240604131704.3227500-1-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-cs42l43.c b/drivers/spi/spi-cs42l43.c
index c1556b652909226b9e1a7ce0eeacf3ed80595809..3169febd8051468bd699685b7c78f2076135ee66 100644 (file)
--- a/drivers/spi/spi-cs42l43.c
+++ b/drivers/spi/spi-cs42l43.c
@@ -19,7 +19,7 @@
 #include <linux/units.h>
 
 #define CS42L43_FIFO_SIZE              16
-#define CS42L43_SPI_ROOT_HZ            (40 * HZ_PER_MHZ)
+#define CS42L43_SPI_ROOT_HZ            49152000
 #define CS42L43_SPI_MAX_LENGTH         65532
 
 enum cs42l43_spi_cmd {