spi: spi-nxp-fspi: Add the DDR LUT command support

For DTR mode, flexspi need to use DDR LUT command, flexspi will switch
to DDR mode when detect the DDR LUT command.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Link: https://patch.msgid.link/20250917-flexspi-ddr-v2-3-bb9fe2a01889@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index a1c9ad03379682dc1fc2908fbd83e1ae8e91588f..bd61f951d6befdb78cdd84d4531aab378a47c56f 100644 (file)
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -559,12 +559,21 @@ static void nxp_fspi_prepare_lut(struct nxp_fspi *f,
        u32 target_lut_reg;
 
        /* cmd */
-       lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth),
-                            op->cmd.opcode);
+       if (op->cmd.dtr) {
+               lutval[0] |= LUT_DEF(0, LUT_CMD_DDR, LUT_PAD(op->cmd.buswidth),
+                                    op->cmd.opcode >> 8);
+               lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_CMD_DDR,
+                                             LUT_PAD(op->cmd.buswidth),
+                                             op->cmd.opcode & 0xFF);
+               lutidx++;
+       } else {
+               lutval[0] |= LUT_DEF(0, LUT_CMD, LUT_PAD(op->cmd.buswidth),
+                                    op->cmd.opcode);
+       }
 
        /* addr bytes */
        if (op->addr.nbytes) {
-               lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_ADDR,
+               lutval[lutidx / 2] |= LUT_DEF(lutidx, op->addr.dtr ? LUT_ADDR_DDR : LUT_ADDR,
                                              LUT_PAD(op->addr.buswidth),
                                              op->addr.nbytes * 8);
                lutidx++;
@@ -572,7 +581,7 @@ static void nxp_fspi_prepare_lut(struct nxp_fspi *f,
 
        /* dummy bytes, if needed */
        if (op->dummy.nbytes) {
-               lutval[lutidx / 2] |= LUT_DEF(lutidx, LUT_DUMMY,
+               lutval[lutidx / 2] |= LUT_DEF(lutidx, op->dummy.dtr ? LUT_DUMMY_DDR : LUT_DUMMY,
                /*
                 * Due to FlexSPI controller limitation number of PAD for dummy
                 * buswidth needs to be programmed as equal to data buswidth.
@@ -587,7 +596,8 @@ static void nxp_fspi_prepare_lut(struct nxp_fspi *f,
        if (op->data.nbytes) {
                lutval[lutidx / 2] |= LUT_DEF(lutidx,
                                              op->data.dir == SPI_MEM_DATA_IN ?
-                                             LUT_NXP_READ : LUT_NXP_WRITE,
+                                             (op->data.dtr ? LUT_READ_DDR : LUT_NXP_READ) :
+                                             (op->data.dtr ? LUT_WRITE_DDR : LUT_NXP_WRITE),
                                              LUT_PAD(op->data.buswidth),
                                              0);
                lutidx++;