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| author | Boris Brezillon <boris.brezillon@bootlin.com> | 2018-04-26 18:18:14 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-05-11 11:32:43 +0900 |
| commit | c36ff266dc82f4ae797a6f3513c6ffa344f7f1c7 (patch) | |
| tree | ed98cb9350de4166e7ae2fd0e6850b8e9b8e62fe /include/linux/spi/spi.h | |
| parent | 055ed0dabc3043d660f20bfc3b68b644ac58baac (diff) | |
| download | linux-c36ff266dc82f4ae797a6f3513c6ffa344f7f1c7.tar.bz2 | |
spi: Extend the core to ease integration of SPI memory controllers
Some controllers are exposing high-level interfaces to access various
kind of SPI memories. Unfortunately they do not fit in the current
spi_controller model and usually have drivers placed in
drivers/mtd/spi-nor which are only supporting SPI NORs and not SPI
memories in general.
This is an attempt at defining a SPI memory interface which works for
all kinds of SPI memories (NORs, NANDs, SRAMs).
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@exceet.de>
Tested-by: Frieder Schrempf <frieder.schrempf@exceet.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi/spi.h')
| -rw-r--r-- | include/linux/spi/spi.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index bc6bb325d1bf..a7e0bbed738c 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -27,6 +27,7 @@ struct property_entry; struct spi_controller; struct spi_transfer; struct spi_flash_read_message; +struct spi_controller_mem_ops; /* * INTERFACES between SPI master-side drivers and SPI slave protocol handlers, @@ -376,6 +377,9 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * transfer_one callback. * @handle_err: the subsystem calls the driver to handle an error that occurs * in the generic implementation of transfer_one_message(). + * @mem_ops: optimized/dedicated operations for interactions with SPI memory. + * This field is optional and should only be implemented if the + * controller has native support for memory like operations. * @unprepare_message: undo any work done by prepare_message(). * @slave_abort: abort the ongoing transfer request on an SPI slave controller * @spi_flash_read: to support spi-controller hardwares that provide @@ -564,6 +568,9 @@ struct spi_controller { void (*handle_err)(struct spi_controller *ctlr, struct spi_message *message); + /* Optimized handlers for SPI memory-like operations. */ + const struct spi_controller_mem_ops *mem_ops; + /* gpio chip select */ int *cs_gpios; |