spi: spi-nxp-fspi: Add OCT-DTR mode support

JIRA: https://issues.redhat.com/browse/RHEL-104570

commit 0f67557
Author: Haibo Chen <haibo.chen@nxp.com>
Date:   Wed Sep 17 15:27:10 2025 +0800

    spi: spi-nxp-fspi: Add OCT-DTR mode support

    Add OCT-DTR mode support in default, since flexspi do not supports
    swapping bytes on a 16 bit boundary in OCT-DTR mode, so mark swap16
    as false.

    lx2160a do not support DQS, so add a quirk to disable DTR mode for this
    platform.

    Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
    Reviewed-by: Frank Li <Frank.Li@nxp.com>
    Link: https://patch.msgid.link/20250917-flexspi-ddr-v2-5-bb9fe2a01889@nxp.com
    Signed-off-by: Mark Brown <broonie@kernel.org>

Signed-off-by: Mattijs Korpershoek <mkorpershoek@redhat.com>

Author: makohoek

drivers/spi/spi-nxp-fspi.c

@@ -330,6 +330,8 @@
 
 /* Access flash memory using IP bus only */
 #define FSPI_QUIRK_USE_IP_ONLY	BIT(0)
+/* Disable DTR */
+#define FSPI_QUIRK_DISABLE_DTR	BIT(1)
 
 struct nxp_fspi_devtype_data {
 	unsigned int rxfifo;
@@ -344,7 +346,7 @@ static struct nxp_fspi_devtype_data lx2160a_data = {
 	.rxfifo = SZ_512,       /* (64  * 64 bits)  */
 	.txfifo = SZ_1K,        /* (128 * 64 bits)  */
 	.ahb_buf_size = SZ_2K,  /* (256 * 64 bits)  */
-	.quirks = 0,
+	.quirks = FSPI_QUIRK_DISABLE_DTR,
 	.lut_num = 32,
 	.little_endian = true,  /* little-endian    */
 };
@@ -1232,6 +1234,13 @@ static const struct spi_controller_mem_ops nxp_fspi_mem_ops = {
 };
 
 static const struct spi_controller_mem_caps nxp_fspi_mem_caps = {
+	.dtr = true,
+	.swap16 = false,
+	.per_op_freq = true,
+};
+
+static const struct spi_controller_mem_caps nxp_fspi_mem_caps_disable_dtr = {
+	.dtr = false,
 	.per_op_freq = true,
 };
 
@@ -1347,7 +1356,12 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	ctlr->bus_num = -1;
 	ctlr->num_chipselect = NXP_FSPI_MAX_CHIPSELECT;
 	ctlr->mem_ops = &nxp_fspi_mem_ops;
-	ctlr->mem_caps = &nxp_fspi_mem_caps;
+
+	if (f->devtype_data->quirks & FSPI_QUIRK_DISABLE_DTR)
+		ctlr->mem_caps = &nxp_fspi_mem_caps_disable_dtr;
+	else
+		ctlr->mem_caps = &nxp_fspi_mem_caps;
+
 	ctlr->dev.of_node = np;
 
 	ret = devm_add_action_or_reset(dev, nxp_fspi_cleanup, f);