Commit 4a3cc7fb authored by Miquel Raynal's avatar Miquel Raynal
Browse files

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: default avatarMiquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: default avatarPratyush Yadav <p.yadav@ti.com>
Reviewed-by: default avatarBoris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: default avatarTudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/linux-mtd/20220127091808.1043392-2-miquel.raynal@bootlin.com
parent 70e038f8

include/linux/spi/spi-mem.h

+11 −0
Original line number Diff line number Diff line
@@ -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

include/linux/spi/spi.h

+3 −0
Original line number Diff line number Diff line
@@ -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;