linux-kernel - [PATCH v2 1/5] spi: spi-nxp-fspi: extract function nxp_fspi_dll

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Message-Id: <20250917-flexspi-ddr-v2-1-bb9fe2a01889@nxp.com>
Date: Wed, 17 Sep 2025 15:27:06 +0800
From: Haibo Chen <haibo.chen@....com>
To: Han Xu <han.xu@....com>, Yogesh Gaur <yogeshgaur.83@...il.com>, 
 Mark Brown <broonie@...nel.org>, Frank Li <frank.li@....com>
Cc: linux-spi@...r.kernel.org, imx@...ts.linux.dev, 
 linux-kernel@...r.kernel.org, Haibo Chen <haibo.chen@....com>
Subject: [PATCH v2 1/5] spi: spi-nxp-fspi: extract function
 nxp_fspi_dll_override()

Extract function nxp_fspi_dll_override(), this is the suggested setting
when clock rate < 100MHz. Just the preparation of supportting DTR mode.

Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/spi/spi-nxp-fspi.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 848fa9319e36d65e8152931324b8e34eb162f5d3..db4b92490de957580c6298baeb8b68a310c23615 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -674,6 +674,17 @@ static void nxp_fspi_dll_calibration(struct nxp_fspi *f)
 		dev_warn(f->dev, "DLL lock failed, please fix it!\n");
 }
 
+/*
+ * Config the DLL register to default value, enable the target 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.
+ */
+static void nxp_fspi_dll_override(struct nxp_fspi *f)
+{
+	fspi_writel(f, FSPI_DLLACR_OVRDEN, f->iobase + FSPI_DLLACR);
+	fspi_writel(f, FSPI_DLLBCR_OVRDEN, f->iobase + FSPI_DLLBCR);
+}
+
 /*
  * In FlexSPI controller, flash access is based on value of FSPI_FLSHXXCR0
  * register and start base address of the target device.
@@ -1071,13 +1082,7 @@ static int nxp_fspi_default_setup(struct nxp_fspi *f)
 	/* Disable the module */
 	fspi_writel(f, FSPI_MCR0_MDIS, base + FSPI_MCR0);
 
-	/*
-	 * Config the DLL register to default value, enable the target 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);
+	nxp_fspi_dll_override(f);
 
 	/* enable module */
 	fspi_writel(f, FSPI_MCR0_AHB_TIMEOUT(0xFF) |

-- 
2.34.1