[PATCH v2 1/2] mtd: spi-nor: core: add flag for doing optional SFDP

[Tudor Ambarus]

On 6/3/24 14:09, Esben Haabendal wrote:
> A dedicated flag for triggering call to
> spi_nor_sfdp_init_params_deprecated() allows enabling optional SFDP read
> and parse, with fallback to legacy flash parameters, without having dual,
> quad or octal parameters set in the legacy flash parameters.
> 
> With this, spi-nor flash parts without SFDP that is replaced with a
> different flash NOR flash part that does have SFDP, but shares the same
> manufacturer and device ID is easily handled.
> 
> Signed-off-by: Esben Haabendal <esben at geanix.com>
> ---
>  drivers/mtd/spi-nor/core.c | 3 ++-
>  drivers/mtd/spi-nor/core.h | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 3e1f1913536b..1c4d66fc993b 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -2933,7 +2933,8 @@ static void spi_nor_init_params_deprecated(struct spi_nor *nor)
>  
>  	spi_nor_manufacturer_init_params(nor);
>  
> -	if (nor->info->no_sfdp_flags & (SPI_NOR_DUAL_READ |
> +	if (nor->info->no_sfdp_flags & (SPI_NOR_TRY_SFDP |

I don't like that we update deprecated methods. The solution though is
elegant.

> +					SPI_NOR_DUAL_READ |
>  					SPI_NOR_QUAD_READ |
>  					SPI_NOR_OCTAL_READ |
>  					SPI_NOR_OCTAL_DTR_READ))
> diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
> index 442786685515..77f61a984cb3 100644
> --- a/drivers/mtd/spi-nor/core.h
> +++ b/drivers/mtd/spi-nor/core.h
> @@ -535,6 +535,7 @@ struct flash_info {
>  	u8 no_sfdp_flags;
>  #define SPI_NOR_SKIP_SFDP		BIT(0)
>  #define SECT_4K				BIT(1)
> +#define SPI_NOR_TRY_SFDP		BIT(2)
>  #define SPI_NOR_DUAL_READ		BIT(3)
>  #define SPI_NOR_QUAD_READ		BIT(4)
>  #define SPI_NOR_OCTAL_READ		BIT(5)
>