linux-kernel - [PATCH v2 2/5] spi: spi-nxp-fspi: set back to dll override mode when clock rate

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Message-Id: <20250917-flexspi-ddr-v2-2-bb9fe2a01889@nxp.com>
Date: Wed, 17 Sep 2025 15:27:07 +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 2/5] spi: spi-nxp-fspi: set back to dll override mode
 when clock rate < 100MHz

Preparation of supportting DTR mode. In nor suspend, driver will disable
DTR mode, and enable DTR mode back in nor resume. This require the flexspi
driver has the ability to set back to dll override mode in STR mode when
clock rate < 100MHz.

Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/spi/spi-nxp-fspi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index db4b92490de957580c6298baeb8b68a310c23615..a1c9ad03379682dc1fc2908fbd83e1ae8e91588f 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -767,6 +767,8 @@ static void nxp_fspi_select_mem(struct nxp_fspi *f, struct spi_device *spi,
 	 */
 	if (rate > 100000000)
 		nxp_fspi_dll_calibration(f);
+	else
+		nxp_fspi_dll_override(f);
 
 	f->selected = spi_get_chipselect(spi, 0);
 }

-- 
2.34.1