linux-kernel - [RFC PATCH v2 08/12] spi: cadence-quadspi: read 'has-dqs' DT property

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Message-ID: <20260113141617.1905039-9-s-k6@ti.com>
Date: Tue, 13 Jan 2026 19:46:13 +0530
From: Santhosh Kumar K <s-k6@...com>
To: <broonie@...nel.org>, <robh@...nel.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <miquel.raynal@...tlin.com>, <richard@....at>,
	<vigneshr@...com>, <tudor.ambarus@...aro.org>, <pratyush@...nel.org>,
	<mwalle@...nel.org>
CC: <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	<praneeth@...com>, <u-kumar1@...com>, <p-mantena@...com>, <a-dutta@...com>,
	<s-k6@...com>
Subject: [RFC PATCH v2 08/12] spi: cadence-quadspi: read 'has-dqs' DT property

Add a boolean field to struct cqspi_flash_pdata to store whether the
attached flash device supports DQS (Data Strobe) mode. Read this from
the 'spi-has-dqs' device tree property during flash node parsing.

This is preparatory infrastructure for PHY tuning support. The field
will be used by subsequent patches to configure read data capture timing
with DQS enabled for improved margins in high-speed operations.

Signed-off-by: Santhosh Kumar K <s-k6@...com>
---
 drivers/spi/spi-cadence-quadspi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index 1d708dde4463..0df286d24256 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -70,6 +70,7 @@ struct cqspi_flash_pdata {
 	u32		tsd2d_ns;
 	u32		tchsh_ns;
 	u32		tslch_ns;
+	bool		has_dqs;
 	u8		cs;
 };
 
@@ -1583,6 +1584,8 @@ static int cqspi_of_get_flash_pdata(struct platform_device *pdev,
 		return -ENXIO;
 	}
 
+	f_pdata->has_dqs = of_property_read_bool(np, "spi-has-dqs");
+
 	return 0;
 }
 
-- 
2.34.1