From 44493062abc38e5895e0cf8d22698f2ca39a1e4d Mon Sep 17 00:00:00 2001 From: Heikki Krogerus Date: Thu, 29 Aug 2019 17:22:33 +0800 Subject: [PATCH] device connection: Add fwnode_connection_find_match() The fwnode_connection_find_match() function is exactly the same as device_connection_find_match(), except it takes struct fwnode_handle as parameter instead of struct device. That allows locating device connections before the device entries have been created. Signed-off-by: Heikki Krogerus Signed-off-by: Chunfeng Yun Link: https://lore.kernel.org/r/1567070558-29417-7-git-send-email-chunfeng.yun@mediatek.com Signed-off-by: Greg Kroah-Hartman --- drivers/base/devcon.c | 43 ++++++++++++++++++++++++++++++------------ include/linux/device.h | 10 +++++++--- 2 files changed, 38 insertions(+), 15 deletions(-) diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c index 09f28479b243..986ad89de2f9 100644 --- a/drivers/base/devcon.c +++ b/drivers/base/devcon.c @@ -12,9 +12,6 @@ static DEFINE_MUTEX(devcon_lock); static LIST_HEAD(devcon_list); -typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep, - void *data); - static void * fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id, void *data, devcon_match_fn_t match) @@ -60,6 +57,34 @@ fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id, return NULL; } +/** + * fwnode_connection_find_match - Find connection from a device node + * @fwnode: Device node with the connection + * @con_id: Identifier for the connection + * @data: Data for the match function + * @match: Function to check and convert the connection description + * + * Find a connection with unique identifier @con_id between @fwnode and another + * device node. @match will be used to convert the connection description to + * data the caller is expecting to be returned. + */ +void *fwnode_connection_find_match(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match) +{ + void *ret; + + if (!fwnode || !match) + return NULL; + + ret = fwnode_graph_devcon_match(fwnode, con_id, data, match); + if (ret) + return ret; + + return fwnode_devcon_match(fwnode, con_id, data, match); +} +EXPORT_SYMBOL_GPL(fwnode_connection_find_match); + /** * device_connection_find_match - Find physical connection to a device * @dev: Device with the connection @@ -83,15 +108,9 @@ void *device_connection_find_match(struct device *dev, const char *con_id, if (!match) return NULL; - if (fwnode) { - ret = fwnode_graph_devcon_match(fwnode, con_id, data, match); - if (ret) - return ret; - - ret = fwnode_devcon_match(fwnode, con_id, data, match); - if (ret) - return ret; - } + ret = fwnode_connection_find_match(fwnode, con_id, data, match); + if (ret) + return ret; mutex_lock(&devcon_lock); diff --git a/include/linux/device.h b/include/linux/device.h index 47ccb2029bc3..b3aa7295b4cb 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -781,10 +781,14 @@ struct device_connection { struct list_head list; }; +typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep, + void *data); + +void *fwnode_connection_find_match(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match); void *device_connection_find_match(struct device *dev, const char *con_id, - void *data, - void *(*match)(struct device_connection *con, - int ep, void *data)); + void *data, devcon_match_fn_t match); struct device *device_connection_find(struct device *dev, const char *con_id); -- 2.45.2