Re: [PATCH 1/2] mtd: spi-nor: spansion: Consider reserved bits in CFR5 register

[Takahiro Kuwano <tkuw584924@gmail.com>]

On 1/11/2023 1:47 AM, Tudor Ambarus wrote:
> CFR5[6] is reserved bit and must be always 1. Set it to comply with flash
> requirements. While fixing SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_{EN, DS}
> definition, stop using magic numbers and describe the missing bit fields
> in CFR5 register. This is useful for both readability and future possible
> addition of Octal STR mode support.
> 
> Fixes: c3266af101f2 ("mtd: spi-nor: spansion: add support for Cypress Semper flash")
> Cc: stable@vger.kernel.org
> Reported-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
> ---
>  drivers/mtd/spi-nor/spansion.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spansion.c b/drivers/mtd/spi-nor/spansion.c
> index b621cdfd506f..07fe0f6fdfe3 100644
> --- a/drivers/mtd/spi-nor/spansion.c
> +++ b/drivers/mtd/spi-nor/spansion.c
> @@ -21,8 +21,13 @@
>  #define SPINOR_REG_CYPRESS_CFR3V		0x00800004
>  #define SPINOR_REG_CYPRESS_CFR3V_PGSZ		BIT(4) /* Page size. */
>  #define SPINOR_REG_CYPRESS_CFR5V		0x00800006
> -#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN	0x3
> -#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS	0
> +#define SPINOR_REG_CYPRESS_CFR5_BIT6		BIT(6)
> +#define SPINOR_REG_CYPRESS_CFR5_DDR		BIT(1)
> +#define SPINOR_REG_CYPRESS_CFR5_OPI		BIT(0)
> +#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_EN				\
> +	(SPINOR_REG_CYPRESS_CFR5_BIT6 |	SPINOR_REG_CYPRESS_CFR5_DDR |	\
> +	 SPINOR_REG_CYPRESS_CFR5_OPI)
> +#define SPINOR_REG_CYPRESS_CFR5V_OCT_DTR_DS	SPINOR_REG_CYPRESS_CFR5_BIT6
>  #define SPINOR_OP_CYPRESS_RD_FAST		0xee
>  
>  /* Cypress SPI NOR flash operations. */

Thank you, Tudor!
I will fix u-boot in the same manner.

Takahiro