Unverified Commit bdc7ca00 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Mark Brown
Browse files

spi: Remove unused function spi_busnum_to_master() 



The last user is gone since commit

	2962db71 ("staging/fbtft: Remove fbtft_device")

in 2019.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20211007121415.2401638-3-u.kleine-koenig@pengutronix.de


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 6bfb15f3

Documentation/spi/spi-summary.rst

+0 −8
Original line number Diff line number Diff line
@@ -336,14 +336,6 @@ certainly includes SPI devices hooked up through the card connectors! 
Non-static Configurations

^^^^^^^^^^^^^^^^^^^^^^^^^



Developer boards often play by different rules than product boards, and one

example is the potential need to hotplug SPI devices and/or controllers.



For those cases you might need to use spi_busnum_to_master() to look

up the spi bus master, and will likely need spi_new_device() to provide the

board info based on the board that was hotplugged.  Of course, you'd later

call at least spi_unregister_device() when that board is removed.



When Linux includes support for MMC/SD/SDIO/DataFlash cards through SPI, those

configurations will also be dynamic.  Fortunately, such devices all support

basic device identification probes, so they should hotplug normally.

drivers/spi/spi.c

+0 −35
Original line number Diff line number Diff line
@@ -3033,41 +3033,6 @@ int spi_controller_resume(struct spi_controller *ctlr) 
}

EXPORT_SYMBOL_GPL(spi_controller_resume);



static int __spi_controller_match(struct device *dev, const void *data)

{

	struct spi_controller *ctlr;

	const u16 *bus_num = data;



	ctlr = container_of(dev, struct spi_controller, dev);

	return ctlr->bus_num == *bus_num;

}



/**

 * spi_busnum_to_master - look up master associated with bus_num

 * @bus_num: the master's bus number

 * Context: can sleep

 *

 * This call may be used with devices that are registered after

 * arch init time.  It returns a refcounted pointer to the relevant

 * spi_controller (which the caller must release), or NULL if there is

 * no such master registered.

 *

 * Return: the SPI master structure on success, else NULL.

 */

struct spi_controller *spi_busnum_to_master(u16 bus_num)

{

	struct device		*dev;

	struct spi_controller	*ctlr = NULL;



	dev = class_find_device(&spi_master_class, NULL, &bus_num,

				__spi_controller_match);

	if (dev)

		ctlr = container_of(dev, struct spi_controller, dev);

	/* reference got in class_find_device */

	return ctlr;

}

EXPORT_SYMBOL_GPL(spi_busnum_to_master);



/*-------------------------------------------------------------------------*/



/* Core methods for SPI resource management */

include/linux/spi/spi.h

+0 −2
Original line number Diff line number Diff line
@@ -760,8 +760,6 @@ extern int devm_spi_register_controller(struct device *dev, 
					struct spi_controller *ctlr);

extern void spi_unregister_controller(struct spi_controller *ctlr);



extern struct spi_controller *spi_busnum_to_master(u16 busnum);



/*

 * SPI resource management while processing a SPI message

 */