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[1/2] spi: spi-nxp-fspi: correct the comment for the DLL config

Message ID 20230322090451.3179431-1-haibo.chen@nxp.com
State Accepted
Commit 1ab09f1d070c4774175dab95e55d2b72c2a054ab
Headers show
Series [1/2] spi: spi-nxp-fspi: correct the comment for the DLL config | expand

Commit Message

Bough Chen March 22, 2023, 9:04 a.m. UTC 
From: Haibo Chen <haibo.chen@nxp.com>

Current DLL config is just to use the default setting, this means
enable the DLL override mode, and use 1 fixed delay cell in the
DLL delay chain, not means "reset" the DLL, so correct this to
avoid confuse.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 drivers/spi/spi-nxp-fspi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 76168cc1e00d..6735c22b9137 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -997,7 +997,11 @@  static int nxp_fspi_default_setup(struct nxp_fspi *f)
 	/* Disable the module */
 	fspi_writel(f, FSPI_MCR0_MDIS, base + FSPI_MCR0);
 
-	/* Reset the DLL register to default value */
+	/*
+	 * Config the DLL register to default value, enable the slave clock delay
+	 * line delay cell override mode, and use 1 fixed delay cell in DLL delay
+	 * chain, this is the suggested setting when clock rate < 100MHz.
+	 */
 	fspi_writel(f, FSPI_DLLACR_OVRDEN, base + FSPI_DLLACR);
 	fspi_writel(f, FSPI_DLLBCR_OVRDEN, base + FSPI_DLLBCR);