From: Stefan Mätje <stefan.maetje@esd.eu>
Date: Tue, 30 Nov 2021 00:06:56 +0000 (+0100)
Subject: Fix wrong QSPI clock calculation for AM4372
X-Git-Tag: v2025.01-rc5-pxa1908~1578^2~2
X-Git-Url: http://git.dujemihanovic.xyz/img/%7B%7B?a=commitdiff_plain;h=a6e562fe36b2bae780589a81a11fceb6e1b4a9f7;p=u-boot.git

Fix wrong QSPI clock calculation for AM4372

On AM4372 the SPI_GCLK input gets its clock from the PRCM module which
divides the PER_CLKOUTM2 frequency (192MHz) by a fixed factor of 4.
See AM437x Reference Manual in section 27 QSPI >> 27.2 Integration.

The QSPI_FCLK therefore needs to take this factor into account and
becomes (192000000 / 4).

Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
---

diff --git a/drivers/spi/ti_qspi.c b/drivers/spi/ti_qspi.c
index c542f40c7d..99acb10882 100644
--- a/drivers/spi/ti_qspi.c
+++ b/drivers/spi/ti_qspi.c
@@ -30,7 +30,8 @@ DECLARE_GLOBAL_DATA_PTR;
 
 /* ti qpsi register bit masks */
 #define QSPI_TIMEOUT                    2000000
-#define QSPI_FCLK			192000000
+/* AM4372: QSPI gets SPI_GCLK from PRCM unit as PER_CLKOUTM2 divided by 4. */
+#define QSPI_FCLK                       (192000000 / 4)
 #define QSPI_DRA7XX_FCLK                76800000
 #define QSPI_WLEN_MAX_BITS		128
 #define QSPI_WLEN_MAX_BYTES		(QSPI_WLEN_MAX_BITS >> 3)