The body of the loop is taken from the exynos driver. It appears to
also be useful in msm, and I've used it in vc4.
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
---
This is separated from converting exynos to use it, to let it land
separately and not have to sync between trees.
drivers/base/component.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/linux/component.h | 5 +++++
2 files changed, 45 insertions(+)
diff --git a/drivers/base/component.c b/drivers/base/component.c
index f748430..08167a3 100644
--- a/drivers/base/component.c
+++ b/drivers/base/component.c
@@ -16,6 +16,7 @@
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
+#include <linux/platform_device.h>
#include <linux/slab.h>
struct component_match {
@@ -283,6 +284,45 @@ void component_match_add(struct device *dev, struct component_match **matchptr,
}
EXPORT_SYMBOL(component_match_add);
+static int compare_dev(struct device *dev, void *data)
+{
+ return dev == (struct device *)data;
+}
+
+/**
+ * component_match_add_platform_drivers - For each driver passed in,
+ * finds each device that probed with it and adds it as a component
+ * driver to the match list.
+ * @dev: master device for the components
+ * @match: pointer to the match structure pointer. For the first
+ * component_match_add(), this should be a pointer to a NULL
+ * pointer, which will get filled in by the call.
+ * @drivers: array of platform drivers whose devices should all be
+ * added to the match
+ * @count: number of platform drivers to match
+ */
+void component_match_add_platform_drivers(struct device *dev,
+ struct component_match **match,
+ struct platform_driver *const *drivers,
+ int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ struct device_driver *drv = &drivers[i]->driver;
+ struct device *p = NULL, *d;
+
+ while ((d = bus_find_device(&platform_bus_type, p, drv,
+ (void *)platform_bus_type.match))) {
+ put_device(p);
+ component_match_add(dev, match, compare_dev, d);
+ p = d;
+ }
+ put_device(p);
+ }
+}
+EXPORT_SYMBOL_GPL(component_match_add_platform_drivers);
+
int component_master_add_with_match(struct device *dev,
const struct component_master_ops *ops,
struct component_match *match)
diff --git a/include/linux/component.h b/include/linux/component.h
index c00dcc3..2d74420 100644
--- a/include/linux/component.h
+++ b/include/linux/component.h
@@ -2,6 +2,7 @@
#define COMPONENT_H
struct device;
+struct platform_driver;
struct component_ops {
int (*bind)(struct device *, struct device *, void *);
@@ -35,5 +36,9 @@ int component_master_add_with_match(struct device *,
const struct component_master_ops *, struct component_match *);
void component_match_add(struct device *, struct component_match **,
int (*compare)(struct device *, void *), void *compare_data);
+void component_match_add_platform_drivers(struct device *dev,
+ struct component_match **match,
+ struct platform_driver *const *drivers,
+ int count);
#endif
--
2.1.4
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