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spi: Remove unused function spi_busnum_to_master()

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	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 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 When Linux includes support for MMC/SD/SDIO/DataFlash cards through SPI, those
configurations will also be dynamic. Fortunately, such devices all support configurations will also be dynamic. Fortunately, such devices all support
basic device identification probes, so they should hotplug normally. 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); 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 */ /* 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); struct spi_controller *ctlr);
extern void spi_unregister_controller(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 * SPI resource management while processing a SPI message
*/ */