[PATCH v2 1/8] mtd: spi-nor: core: Introduce number of dice and volatile register offset params

[tkuw584924 at gmail.com]

From: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>

In use of mult-chip devices, we need to access registers in each die for
configuration and status check. The number of dice in the device and
volatile register offset for each die are essential to iterate register
access ops.

The number of dice must be initialized as 1 and may be updated through
SFDP parse.

The volatile register offset table is dinamically allocated based on
the number of dice then filled with offset values collected from SFDP.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano at infineon.com>
---
 drivers/mtd/spi-nor/core.c | 1 +
 drivers/mtd/spi-nor/core.h | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index b500655f7937..f18be6283740 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2576,6 +2576,7 @@ static void spi_nor_init_default_params(struct spi_nor *nor)
 	params->writesize = 1;
 	params->size = (u64)info->sector_size * info->n_sectors;
 	params->page_size = info->page_size;
+	params->num_of_dice = 1;
 
 	if (!(info->flags & SPI_NOR_NO_FR)) {
 		/* Default to Fast Read for DT and non-DT platform devices. */
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index f6d012e1f681..c876ece62f13 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -349,6 +349,8 @@ struct spi_nor_otp {
  *			in octal DTR mode.
  * @rdsr_addr_nbytes:	dummy address bytes needed for Read Status Register
  *			command in octal DTR mode.
+ * @num_of_dice:	number of dice in the flash memory.
+ * @vreg_offset:	volatile register offset for each die.
  * @hwcaps:		describes the read and page program hardware
  *			capabilities.
  * @reads:		read capabilities ordered by priority: the higher index
@@ -381,6 +383,8 @@ struct spi_nor_flash_parameter {
 	u8				addr_mode_nbytes;
 	u8				rdsr_dummy;
 	u8				rdsr_addr_nbytes;
+	u8				num_of_dice;
+	u32				*vreg_offset;
 
 	struct spi_nor_hwcaps		hwcaps;
 	struct spi_nor_read_command	reads[SNOR_CMD_READ_MAX];
-- 
2.25.1