mtd: rawnand: timings: Add mode information to the timings structure

Convert the timings union into a structure containing the mode and the
actual values. The values are still a union in prevision of the
addition of the NVDDR modes.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://lore.kernel.org/linux-mtd/20200428094302.14624-2-miquel.raynal@bootlin.com

drivers/mtd/nand/raw/nand_timings.c

@@ -16,6 +16,7 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	/* Mode 0 */
 	{
 		.type = NAND_SDR_IFACE,
+		.timings.mode = 0,
 		.timings.sdr = {
 			.tCCS_min = 500000,
 			.tR_max = 200000000,
@@ -58,6 +59,7 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	/* Mode 1 */
 	{
 		.type = NAND_SDR_IFACE,
+		.timings.mode = 1,
 		.timings.sdr = {
 			.tCCS_min = 500000,
 			.tR_max = 200000000,
@@ -100,6 +102,7 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	/* Mode 2 */
 	{
 		.type = NAND_SDR_IFACE,
+		.timings.mode = 2,
 		.timings.sdr = {
 			.tCCS_min = 500000,
 			.tR_max = 200000000,
@@ -142,6 +145,7 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	/* Mode 3 */
 	{
 		.type = NAND_SDR_IFACE,
+		.timings.mode = 3,
 		.timings.sdr = {
 			.tCCS_min = 500000,
 			.tR_max = 200000000,
@@ -184,6 +188,7 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	/* Mode 4 */
 	{
 		.type = NAND_SDR_IFACE,
+		.timings.mode = 4,
 		.timings.sdr = {
 			.tCCS_min = 500000,
 			.tR_max = 200000000,
@@ -226,6 +231,7 @@ static const struct nand_data_interface onfi_sdr_timings[] = {
 	/* Mode 5 */
 	{
 		.type = NAND_SDR_IFACE,
+		.timings.mode = 5,
 		.timings.sdr = {
 			.tCCS_min = 500000,
 			.tR_max = 200000000,

include/linux/mtd/rawnand.h

@@ -491,13 +491,17 @@ enum nand_data_interface_type {
 /**
  * struct nand_data_interface - NAND interface timing
  * @type:	 type of the timing
- * @timings:	 The timing, type according to @type
+ * @timings:	 The timing information
+ * @timings.mode: Timing mode as defined in the specification
  * @timings.sdr: Use it when @type is %NAND_SDR_IFACE.
  */
 struct nand_data_interface {
 	enum nand_data_interface_type type;
-	union {
-		struct nand_sdr_timings sdr;
+	struct nand_timings {
+		unsigned int mode;
+		union {
+			struct nand_sdr_timings sdr;
+		};
 	} timings;
 };