[PATCH v9 07/18] spi: cadence-quadspi: add DQS support to read data capture
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COLD44d
SUPERSEDED: 1 (1M)
From: Santhosh Kumar K <hidden>
Date: 2026-08-25 17:18:47
Also in:
linux-spi, lkml
Subsystem:
spi subsystem, the rest · Maintainers:
Mark Brown, Linus Torvalds
Revision v9 of 9 in this series; 1 review trailer.
Revisions (9)
Add DQS (Data Strobe) parameter to cqspi_readdata_capture() to control data capture timing. DQS mode uses a dedicated strobe signal for improved timing margins in high-speed SPI modes. Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Santhosh Kumar K <redacted> --- drivers/spi/spi-cadence-quadspi.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index f8e266372367..046fa5d69b0f 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c@@ -192,6 +192,7 @@ struct cqspi_driver_platdata { #define CQSPI_REG_READCAPTURE_BYPASS_LSB 0 #define CQSPI_REG_READCAPTURE_DELAY_LSB 1 #define CQSPI_REG_READCAPTURE_DELAY_MASK 0xF +#define CQSPI_REG_READCAPTURE_DQS_LSB 8 #define CQSPI_REG_SIZE 0x14 #define CQSPI_REG_SIZE_ADDRESS_LSB 0
@@ -458,7 +459,7 @@ static int cqspi_wait_idle(struct cqspi_st *cqspi) } static void cqspi_readdata_capture(struct cqspi_st *cqspi, const bool bypass, - const unsigned int delay) + const bool dqs, const unsigned int delay) { void __iomem *reg_base = cqspi->iobase; unsigned int reg;
@@ -476,6 +477,11 @@ static void cqspi_readdata_capture(struct cqspi_st *cqspi, const bool bypass, reg |= (delay & CQSPI_REG_READCAPTURE_DELAY_MASK) << CQSPI_REG_READCAPTURE_DELAY_LSB; + if (dqs) + reg |= BIT(CQSPI_REG_READCAPTURE_DQS_LSB); + else + reg &= ~BIT(CQSPI_REG_READCAPTURE_DQS_LSB); + writel(reg, reg_base + CQSPI_REG_READCAPTURE); }
@@ -1317,7 +1323,7 @@ static void cqspi_configure(struct cqspi_flash_pdata *f_pdata, cqspi->sclk = sclk; cqspi_config_baudrate_div(cqspi); cqspi_delay(f_pdata); - cqspi_readdata_capture(cqspi, !cqspi->rclk_en, + cqspi_readdata_capture(cqspi, !cqspi->rclk_en, false, f_pdata->read_delay); }
--
2.34.1