spi: spi-fsl-dspi: Re-use one volatile regmap for both device types

max_register overrides anything in the volatile ranges, so we can get
away with sharing the same one for both types. In a later commit we'll
add more devices so this avoids adding even more duplication. Also
replace the max_register magic numbers with their register definitions
so it's clearer what's going on.

No functional changes.

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: James Clark <james.clark@linaro.org>
Link: https://patch.msgid.link/20250522-james-nxp-spi-v2-4-bea884630cfb@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: james-c-linaro

drivers/spi/spi-fsl-dspi.c

@@ -1209,6 +1209,7 @@ static const struct regmap_range dspi_volatile_ranges[] = {
 	regmap_reg_range(SPI_MCR, SPI_TCR),
 	regmap_reg_range(SPI_SR, SPI_SR),
 	regmap_reg_range(SPI_PUSHR, SPI_RXFR3),
+	regmap_reg_range(SPI_SREX, SPI_SREX),
 };
 
 static const struct regmap_access_table dspi_volatile_table = {
@@ -1220,31 +1221,19 @@ static const struct regmap_config dspi_regmap_config = {
 	.reg_bits	= 32,
 	.val_bits	= 32,
 	.reg_stride	= 4,
-	.max_register	= 0x88,
+	.max_register	= SPI_RXFR3,
 	.volatile_table	= &dspi_volatile_table,
 	.rd_table	= &dspi_access_table,
 	.wr_table	= &dspi_access_table,
 };
 
-static const struct regmap_range dspi_xspi_volatile_ranges[] = {
-	regmap_reg_range(SPI_MCR, SPI_TCR),
-	regmap_reg_range(SPI_SR, SPI_SR),
-	regmap_reg_range(SPI_PUSHR, SPI_RXFR3),
-	regmap_reg_range(SPI_SREX, SPI_SREX),
-};
-
-static const struct regmap_access_table dspi_xspi_volatile_table = {
-	.yes_ranges	= dspi_xspi_volatile_ranges,
-	.n_yes_ranges	= ARRAY_SIZE(dspi_xspi_volatile_ranges),
-};
-
 static const struct regmap_config dspi_xspi_regmap_config[] = {
 	{
 		.reg_bits	= 32,
 		.val_bits	= 32,
 		.reg_stride	= 4,
-		.max_register	= 0x13c,
-		.volatile_table	= &dspi_xspi_volatile_table,
+		.max_register	= SPI_SREX,
+		.volatile_table	= &dspi_volatile_table,
 		.rd_table	= &dspi_access_table,
 		.wr_table	= &dspi_access_table,
 	},