mtd: spi-nor: provide default erase_sector implementation

Some spi-nor drivers perform sector erase by duplicating their
write_reg() command. Let's not require that the driver fill this out,
and provide a default instead.

Tested on m25p80.c and Medatek's MT8173 SPI NOR flash driver.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index 955f268d159a..7bed97471e53 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -143,7 +143,8 @@ struct mtd_info;
  * @read:               [DRIVER-SPECIFIC] read data from the SPI NOR
  * @write:              [DRIVER-SPECIFIC] write data to the SPI NOR
  * @erase:              [DRIVER-SPECIFIC] erase a sector of the SPI NOR
- *                      at the offset @offs
+ *                      at the offset @offs; if not provided by the driver,
+ *                      spi-nor will send the erase opcode via write_reg()
  * @flash_lock:         [FLASH-SPECIFIC] lock a region of the SPI NOR
  * @flash_unlock:       [FLASH-SPECIFIC] unlock a region of the SPI NOR
  * @flash_is_locked:    [FLASH-SPECIFIC] check if a region of the SPI NOR is