diff options
| -rw-r--r-- | drivers/tty/serdev/core.c | 19 | ||||
| -rw-r--r-- | include/linux/serdev.h | 9 |
2 files changed, 28 insertions, 0 deletions
diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c index 8f25510f89b6..bf88b95f7458 100644 --- a/drivers/tty/serdev/core.c +++ b/drivers/tty/serdev/core.c @@ -514,6 +514,25 @@ err_free: } EXPORT_SYMBOL_GPL(serdev_controller_alloc); +#ifdef CONFIG_OF +/** + * of_find_serdev_controller_by_node() - Find the serdev controller associated + * with the devicetree node + * @node: Devicetree node + * + * Return: Pointer to the serdev controller associated with the node. NULL if + * the controller is not found. Caller is responsible for calling + * serdev_controller_put() to drop the reference. + */ +struct serdev_controller *of_find_serdev_controller_by_node(struct device_node *node) +{ + struct device *dev = bus_find_device_by_of_node(&serdev_bus_type, node); + + return (dev && dev->type == &serdev_ctrl_type) ? to_serdev_controller(dev) : NULL; +} +EXPORT_SYMBOL_GPL(of_find_serdev_controller_by_node); +#endif + static int of_serdev_register_devices(struct serdev_controller *ctrl) { struct device_node *node; diff --git a/include/linux/serdev.h b/include/linux/serdev.h index 0c7d3c27d1f8..188c0ba62d50 100644 --- a/include/linux/serdev.h +++ b/include/linux/serdev.h @@ -334,4 +334,13 @@ static inline bool serdev_acpi_get_uart_resource(struct acpi_resource *ares, } #endif /* CONFIG_ACPI */ +#ifdef CONFIG_OF +struct serdev_controller *of_find_serdev_controller_by_node(struct device_node *node); +#else +static inline struct serdev_controller *of_find_serdev_controller_by_node(struct device_node *node) +{ + return NULL; +} +#endif /* CONFIG_OF */ + #endif /*_LINUX_SERDEV_H */ |