Setting the status register write disable (SRWD) bit in the status
register (SR) with WP# signal of the flash not connected or wrongly tied to
GND (that includes internal pull-downs), will configure the SR permanently
as read-only. To avoid this a boolean type DT property "no-wp" is
introduced. If this property is defined, the spi-nor doesn't set the SRWD
bit in SR while performing flash protection operation.
---
BRANCH: for-next
Changes in v4:
- Added SNOR_F_NO_WP flag info in debugfs.c file.
- Updated comments in swp.c file.
- Added Reviewed-by tags in 1/2.
Changes in v3:
- Updated DT property name to "no-wp".
- Removed Reviewed-by tag from 1/2 as the DT property name has changed.
- Updated spi-nor flag name to SNOR_F_NO_WP.
- Updated DT property description.
- Updated patch description.
- Updated comments in swp.c file.
- Replaced WP with WP# in patch descriptions, comments & DT property
description.
Changes in v2:
- Modified DT property description to add information about a
valid use case.
- Added Reviewed-by tag in 1/2.
- Updated comment description in 2/2.
---
Amit Kumar Mahapatra (2):
dt-bindings: mtd: jedec, spi-nor: Add DT property to avoid setting
SRWD bit in status register
mtd: spi-nor: Avoid setting SRWD bit in SR if WP# signal not connected
.../devicetree/bindings/mtd/jedec,spi-nor.yaml | 15 +++++++++++++++
drivers/mtd/spi-nor/core.c | 3 +++
drivers/mtd/spi-nor/core.h | 1 +
drivers/mtd/spi-nor/debugfs.c | 1 +
drivers/mtd/spi-nor/swp.c | 9 +++++++--
5 files changed, 27 insertions(+), 2 deletions(-)
--
2.17.1
