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spi: export of_find_spi_controller_by_node()

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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: Oder Chiou <oder_chiou@realtek.com>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/0e572a00aa305e588357162d400ba9472ce56dd3.1767148150.git.oder_chiou@realtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Oder Chiou 2025-12-31 10:35:44 +08:00 committed by Mark Brown
parent 9ace4753a5
commit ee69f55eb1
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2 changed files with 11 additions and 1 deletions
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3
drivers/spi/spi.c
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@ -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)

9
include/linux/spi/spi.h
View File

@ -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,