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spi: spi-mem: Introduce a capability structure 

Create a spi_controller_mem_caps structure and put it within the
spi_controller structure close to the spi_controller_mem_ops
strucure. So far the only field in this structure is the support for dtr
operations, but soon we will add another parameter.

Also create a helper to parse the capabilities and check if the
requested capability has been set or not.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20220127091808.1043392-2-miquel.raynal@bootlin.com
This commit is contained in:
Miquel Raynal 2022-01-27 10:17:56 +01:00
parent 70e038f89b
commit 4a3cc7fb6e
2 changed files with 14 additions and 0 deletions
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11
include/linux/spi/spi-mem.h
View File

@ -285,6 +285,17 @@ struct spi_controller_mem_ops {
unsigned long timeout_ms);
};
/**
* struct spi_controller_mem_caps - SPI memory controller capabilities
* @dtr: Supports DTR operations
*/
struct spi_controller_mem_caps {
bool dtr;
};
#define spi_mem_controller_is_capable(ctlr, cap) \
((ctlr)->mem_caps && (ctlr)->mem_caps->cap)
/**
* struct spi_mem_driver - SPI memory driver
* @spidrv: inherit from a SPI driver

3
include/linux/spi/spi.h
View File

@ -23,6 +23,7 @@ struct ptp_system_timestamp;
struct spi_controller;
struct spi_transfer;
struct spi_controller_mem_ops;
struct spi_controller_mem_caps;
/*
* INTERFACES between SPI master-side drivers and SPI slave protocol handlers,
@ -415,6 +416,7 @@ extern struct spi_device *spi_new_ancillary_device(struct spi_device *spi, u8 ch
* @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.
* @mem_caps: controller capabilities for the handling of memory operations.
* @unprepare_message: undo any work done by prepare_message().
* @slave_abort: abort the ongoing transfer request on an SPI slave controller
* @cs_gpios: LEGACY: array of GPIO descs to use as chip select lines; one per
@ -639,6 +641,7 @@ struct spi_controller {
/* Optimized handlers for SPI memory-like operations. */
const struct spi_controller_mem_ops *mem_ops;
const struct spi_controller_mem_caps *mem_caps;
/* gpio chip select */
int *cs_gpios;