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

[Tudor Ambarus]

On 08.02.2023 07:53, tkuw584924 at gmail.com wrote:
> 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;

ndice maybe?

> +	u32				*vreg_offset;
>   
>   	struct spi_nor_hwcaps		hwcaps;
>   	struct spi_nor_read_command	reads[SNOR_CMD_READ_MAX];