[PATCH v2 0/3] omap-gpmc wait pin additions

B. Niedermayr
2022-09-05T07:22:10Z

From: Benedikt Niedermayr <benedikt.niedermayr@siemens.com>

There is currently no possibility for the gpmc to set either the
waitp-pin polarity or use the same wait-pin for different cs-regions.

While the current implementation may fullfill most usecases, it may not
be sufficient for more complex setups (e.g. FPGA/ASIC interfaces), where
more complex interfacing options where possible.

For example interfacing an ASIC which offers multiple cs-regions but
only one waitpin the current driver and dt-bindings are not sufficient.

While using the same waitpin for different cs-regions worked for older
kernels (4.14) the omap-gpmc.c driver refused to probe (-EBUSY) with
newer kernels (>5.10).

Changes since v1:
* Rebase against recent 6.0.0-rc3 kernel, but the maintainers list
stays the same!
* Updated eMail recipients list

Benedikt Niedermayr (3):
memory: omap-gpmc: allow shared wait pins
memory: omap-gpmc: add support for wait pin polarity
dt-bindings: memory-controllers: gpmc-child: Add binding for
wait-pin-polarity

.../memory-controllers/ti,gpmc-child.yaml | 7 ++++
drivers/memory/omap-gpmc.c | 38 +++++++++++++++----
include/linux/platform_data/gpmc-omap.h | 1 +
3 files changed, 39 insertions(+), 7 deletions(-)

--
2.25.1