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authorSaravana Kannan <saravanak@google.com>2021-02-06 01:26:41 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-02-09 16:31:06 +0300
commit74c782cff77b3533290148df1fa6f8c7db5e60d5 (patch)
treee0ddd425b9a87cda66d3e559e4f74beff26a5e66 /include/linux/fwnode.h
parenta9dd8f3c2cf3413d9302ef12e88181cf001c3ed8 (diff)
downloadlinux-74c782cff77b3533290148df1fa6f8c7db5e60d5.tar.xz
driver core: fw_devlink: Handle suppliers that don't use driver core
Device links only work between devices that use the driver core to match and bind a driver to a device. So, add an API for frameworks to let the driver core know that a fwnode has been initialized by a driver without using the driver core. Then use this information to make sure that fw_devlink doesn't make the consumers wait indefinitely on suppliers that'll never bind to a driver. Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Saravana Kannan <saravanak@google.com> Link: https://lore.kernel.org/r/20210205222644.2357303-6-saravanak@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/fwnode.h')
-rw-r--r--include/linux/fwnode.h19
1 files changed, 17 insertions, 2 deletions
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index d5caefe39d93..dfefd43a737c 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -11,6 +11,7 @@
#include <linux/types.h>
#include <linux/list.h>
+#include <linux/err.h>
struct fwnode_operations;
struct device;
@@ -18,11 +19,13 @@ struct device;
/*
* fwnode link flags
*
- * LINKS_ADDED: The fwnode has already be parsed to add fwnode links.
- * NOT_DEVICE: The fwnode will never be populated as a struct device.
+ * LINKS_ADDED: The fwnode has already be parsed to add fwnode links.
+ * NOT_DEVICE: The fwnode will never be populated as a struct device.
+ * INITIALIZED: The hardware corresponding to fwnode has been initialized.
*/
#define FWNODE_FLAG_LINKS_ADDED BIT(0)
#define FWNODE_FLAG_NOT_DEVICE BIT(1)
+#define FWNODE_FLAG_INITIALIZED BIT(2)
struct fwnode_handle {
struct fwnode_handle *secondary;
@@ -161,6 +164,18 @@ static inline void fwnode_init(struct fwnode_handle *fwnode,
INIT_LIST_HEAD(&fwnode->suppliers);
}
+static inline void fwnode_dev_initialized(struct fwnode_handle *fwnode,
+ bool initialized)
+{
+ if (IS_ERR_OR_NULL(fwnode))
+ return;
+
+ if (initialized)
+ fwnode->flags |= FWNODE_FLAG_INITIALIZED;
+ else
+ fwnode->flags &= ~FWNODE_FLAG_INITIALIZED;
+}
+
extern u32 fw_devlink_get_flags(void);
extern bool fw_devlink_is_strict(void);
int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);