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linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 9/16/20 3:44 PM, Pratyush Yadav wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > A Soft Reset sequence will return the flash to Power-on-Reset (POR) > state. It consists of two commands: Soft Reset Enable and Soft Reset. > Find out if the sequence is supported from BFPT DWORD 16. > > Signed-off-by: Pratyush Yadav > --- > drivers/mtd/spi-nor/core.h | 1 + > drivers/mtd/spi-nor/sfdp.c | 4 ++++ > drivers/mtd/spi-nor/sfdp.h | 2 ++ > 3 files changed, 7 insertions(+) > > diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h > index fcb5f071ebed..e2c7324d997e 100644 > --- a/drivers/mtd/spi-nor/core.h > +++ b/drivers/mtd/spi-nor/core.h > @@ -26,6 +26,7 @@ enum spi_nor_option_flags { > SNOR_F_HAS_SR_TB_BIT6 = BIT(11), > SNOR_F_HAS_4BIT_BP = BIT(12), > SNOR_F_HAS_SR_BP3_BIT6 = BIT(13), > + SNOR_F_SOFT_RESET = BIT(14), > }; > > struct spi_nor_read_command { > diff --git a/drivers/mtd/spi-nor/sfdp.c b/drivers/mtd/spi-nor/sfdp.c > index cadb1ed27ffe..f192710aca31 100644 > --- a/drivers/mtd/spi-nor/sfdp.c > +++ b/drivers/mtd/spi-nor/sfdp.c > @@ -604,6 +604,10 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor, > break; > } > > + /* Soft Reset support. */ > + if (bfpt.dwords[BFPT_DWORD(16)] & BFPT_DWORD16_SOFT_RST) > + nor->flags |= SNOR_F_SOFT_RESET; minimal support for SWRST but we can extend it later. Looks good. > + > /* Stop here if not JESD216 rev C or later. */ > if (bfpt_header->length == BFPT_DWORD_MAX_JESD216B) > return spi_nor_post_bfpt_fixups(nor, bfpt_header, &bfpt, > diff --git a/drivers/mtd/spi-nor/sfdp.h b/drivers/mtd/spi-nor/sfdp.h > index 6d7243067252..8ae55e98084e 100644 > --- a/drivers/mtd/spi-nor/sfdp.h > +++ b/drivers/mtd/spi-nor/sfdp.h > @@ -90,6 +90,8 @@ struct sfdp_bfpt { > #define BFPT_DWORD15_QER_SR2_BIT1_NO_RD (0x4UL << 20) > #define BFPT_DWORD15_QER_SR2_BIT1 (0x5UL << 20) /* Spansion */ > > +#define BFPT_DWORD16_SOFT_RST BIT(12) the name is too generic. How about #define BFPT_DWORD16_SWRST_EN_RST BIT(12) > + > #define BFPT_DWORD18_CMD_EXT_MASK GENMASK(30, 29) > #define BFPT_DWORD18_CMD_EXT_REP (0x0UL << 29) /* Repeat */ > #define BFPT_DWORD18_CMD_EXT_INV (0x1UL << 29) /* Invert */ > -- > 2.28.0 > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/