Unverified Commit ee69f55e authored by Oder Chiou's avatar Oder Chiou Committed by Mark Brown
Browse files

spi: export of_find_spi_controller_by_node() 



Some devices are primarily described on another bus (e.g. I2C) but also
have an additional SPI connection that serves as a transport for
firmware loading. Export of_find_spi_controller_by_node() so drivers can
obtain the SPI controller referenced by a DT phandle.

Signed-off-by: default avatarOder Chiou <oder_chiou@realtek.com>
Reviewed-by: default avatarCezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/0e572a00aa305e588357162d400ba9472ce56dd3.1767148150.git.oder_chiou@realtek.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 9ace4753

drivers/spi/spi.c

+2 −1
Original line number Diff line number Diff line
@@ -4771,7 +4771,7 @@ static struct spi_device *of_find_spi_device_by_node(struct device_node *node) 
}



/* The spi controllers are not using spi_bus, so we find it with another way */

static struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)

struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)

{

	struct device *dev;
@@ -4784,6 +4784,7 @@ static struct spi_controller *of_find_spi_controller_by_node(struct device_node 
	/* Reference got in class_find_device */

	return container_of(dev, struct spi_controller, dev);

}

EXPORT_SYMBOL_GPL(of_find_spi_controller_by_node);



static int of_spi_notify(struct notifier_block *nb, unsigned long action,

			 void *arg)

include/linux/spi/spi.h

+9 −0
Original line number Diff line number Diff line
@@ -882,6 +882,15 @@ extern int devm_spi_register_controller(struct device *dev, 
					struct spi_controller *ctlr);

extern void spi_unregister_controller(struct spi_controller *ctlr);



#if IS_ENABLED(CONFIG_OF_DYNAMIC)

extern struct spi_controller *of_find_spi_controller_by_node(struct device_node *node);

#else

static inline struct spi_controller *of_find_spi_controller_by_node(struct device_node *node)

{

	return NULL;

}

#endif



#if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SPI_MASTER)

extern struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev);

extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,