spi: spi-qpic-snand: extend FIELD_PREP() macro usage

Large part of the code uses the FIELD_PREP() macro already to construct
values to be written to hardware registers. Change the code to use also
the macro for more registers of which the corresponding bitmasks are
defined already.

This makes the code more readable. It also syncs the affected
codes with their counterparts in the 'qcom_nandc' driver, so it
makes it easier to spot the differences between the two
implementations.

No functional changes intended.

Signed-off-by: Gabor Juhos <j4g8y7@gmail.com>
Reviewed-by: Md Sadre Alam <quic_mdalam@quicinc.com>
Link: https://patch.msgid.link/20250515-qpic-snand-use-bitmasks-v1-2-11729aeae73b@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: juhosg

drivers/spi/spi-qpic-snand.c

@@ -130,9 +130,9 @@ static void qcom_spi_set_read_loc_first(struct qcom_nand_controller *snandc,
 					int is_last_read_loc)
 {
 	__le32 locreg_val;
-	u32 val = (((cw_offset) << READ_LOCATION_OFFSET) |
-		  ((read_size) << READ_LOCATION_SIZE) | ((is_last_read_loc)
-		  << READ_LOCATION_LAST));
+	u32 val = FIELD_PREP(READ_LOCATION_OFFSET_MASK, cw_offset) |
+		  FIELD_PREP(READ_LOCATION_SIZE_MASK, read_size) |
+		  FIELD_PREP(READ_LOCATION_LAST_MASK, is_last_read_loc);
 
 	locreg_val = cpu_to_le32(val);
 
@@ -151,9 +151,9 @@ static void qcom_spi_set_read_loc_last(struct qcom_nand_controller *snandc,
 				       int is_last_read_loc)
 {
 	__le32 locreg_val;
-	u32 val = (((cw_offset) << READ_LOCATION_OFFSET) |
-		  ((read_size) << READ_LOCATION_SIZE) | ((is_last_read_loc)
-		  << READ_LOCATION_LAST));
+	u32 val = FIELD_PREP(READ_LOCATION_OFFSET_MASK, cw_offset) |
+		  FIELD_PREP(READ_LOCATION_SIZE_MASK, read_size) |
+		  FIELD_PREP(READ_LOCATION_LAST_MASK, is_last_read_loc);
 
 	locreg_val = cpu_to_le32(val);
 
@@ -352,7 +352,7 @@ static int qcom_spi_ecc_init_ctx_pipelined(struct nand_device *nand)
 			       FIELD_PREP(ECC_MODE_MASK, 0) |
 			       FIELD_PREP(ECC_PARITY_SIZE_BYTES_BCH_MASK, ecc_cfg->ecc_bytes_hw);
 
-	ecc_cfg->ecc_buf_cfg = 0x203 << NUM_STEPS;
+	ecc_cfg->ecc_buf_cfg = FIELD_PREP(NUM_STEPS_MASK, 0x203);
 	ecc_cfg->clrflashstatus = FS_READY_BSY_N;
 	ecc_cfg->clrreadstatus = 0xc0;