On 21/10/2022 11:16, B. Niedermayr wrote: > From: Benedikt Niedermayr <benedikt.niedermayr@xxxxxxxxxxx> > > Currently it is not possible to configure the WAIT0PINPOLARITY and > WAIT1PINPOLARITY bits of the GPMC_CONFIG register directly via > device tree properties. > > It is also not possible to 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 > * Updated eMail recipients list > Changes since v2: > * Remove the gpmc register configuration out of the gpiochip > callbacks. In this case the memory interface configuration > is not done via gpio bindings. > * Some minor code fixes > * Changed git commit descriptions > Change since v3: > * Use a uint32 dt-property instean a boolean one > * If the dt-property is not set, then don't touch the > GPMC_CONFIG register > * Changed git commit descriptions > Changes since v4: > * Use checkpatch with "--strict" option > * Moved wait-pin sanity checks to gpmc_read_settings_dt() > * Always assign WAITPINPOLARITY_DEFAULT on error cases > * Track waitpin allocation within gpmc for determine > allocation origin > Changes since v5: > * Tracking of wait-pin allocations with polarity change detection > * Introduced a new struct gpmc_waitpin > * Add GPMC_* to global header definitions > * Don't allow GPMC_WAITPINPOLARITY_DEFAULT when parsing dt-properties > * Squashed wait-pin-polarity and shared-wait-pin patches, since they > should not be separated > Changes since v6: > * Move wait-pin allocation into gpmc_probe() > * Fix s/gpmc/GPMC/ in commit description > * use ti,wait-pin-polarity instead of gpmc,wait-pin-polarity > * Refactored if clause in gpmc_alloc_waitpin() > * Revert values for GPMC_WAITPINPOLARITY_ACTIVE_LOW and > GPMC_WAITPINPOLARITY_ACTIVE_HIGH. > Use the exact same values which are written into the register. > Changes since v7: > * Renamed GPMC_WAITPINPOLARITY_DEFAULT to GPMC_WAITPINPOLARITY_INVALID > * Call gpiochip_request_own_desc() only on first wait-pin allocation > * Fixed use of old "gpmc,wait-pin-polarity" property. > > Benedikt Niedermayr (2): > memory: omap-gpmc: wait pin additions > dt-bindings: memory-controllers: gpmc-child: add wait-pin polarity > > .../memory-controllers/ti,gpmc-child.yaml | 7 + > drivers/memory/omap-gpmc.c | 122 ++++++++++++++++-- > include/linux/platform_data/gpmc-omap.h | 8 ++ > 3 files changed, 124 insertions(+), 13 deletions(-) for this series Reviewed-by: Roger Quadros <rogerq@xxxxxxxxxx> cheers, -roger
