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spi: Remove unused function spi_busnum_to_master() 

The last user is gone since commit

	2962db71c7 ("staging/fbtft: Remove fbtft_device")

in 2019.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20211007121415.2401638-3-u.kleine-koenig@pengutronix.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Uwe Kleine-König 2021-10-07 14:14:13 +02:00 committed by Mark Brown
parent 6bfb15f34d
commit bdc7ca008e
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3 changed files with 0 additions and 45 deletions
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8
Documentation/spi/spi-summary.rst
View File

@ -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.

35
drivers/spi/spi.c
View File

@ -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 */

2
include/linux/spi/spi.h
View File

@ -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
*/