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mtd: spi-nor-core: Add support for Read/Write Any Register

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Some of Spansion/Cypress chips support Read/Write Any Register commands.
These commands are mainly used to write volatile registers and access to
the registers in second and subsequent die for multi-die package parts.

The Read Any Register instruction (65h) is followed by register address
and dummy cycles, then the selected register byte is returned.

The Write Any Register instruction (71h) is followed by register address
and register byte to write.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
This commit is contained in:
Takahiro Kuwano
2021-06-29 15:00:58 +09:00
committed by Jagan Teki
parent c95a914aed
commit 2d20f34485
2 changed files with 27 additions and 0 deletions
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2
include/linux/mtd/spi-nor.h
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@@ -123,6 +123,8 @@
#define SPINOR_OP_BRWR 0x17 /* Bank register write */
#define SPINOR_OP_BRRD 0x16 /* Bank register read */
#define SPINOR_OP_CLSR 0x30 /* Clear status register 1 */
#define SPINOR_OP_RDAR 0x65 /* Read any register */
#define SPINOR_OP_WRAR 0x71 /* Write any register */
/* Used for Micron flashes only. */
#define SPINOR_OP_RD_EVCR 0x65 /* Read EVCR register */