linux-kernel - [PATCH] spi: cs42l43: Correct SPI root clock speed

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Date: Tue, 4 Jun 2024 14:17:04 +0100
From: Charles Keepax <ckeepax@...nsource.cirrus.com>
To: <broonie@...nel.org>
CC: <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>
Subject: [PATCH] spi: cs42l43: Correct SPI root clock speed

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@...nsource.cirrus.com>
---
 drivers/spi/spi-cs42l43.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-cs42l43.c b/drivers/spi/spi-cs42l43.c
index 9d747ea69926..902a0734cc36 100644
--- a/drivers/spi/spi-cs42l43.c
+++ b/drivers/spi/spi-cs42l43.c
@@ -26,7 +26,7 @@
 #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 {
-- 
2.39.2