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Subject[PATCH v4 05/15] drivers: platform: add fwnode base platform devices retrieval
Date
The platform device kernel API does not provide functions to
retrieve a platform device through the corresponding struct
device fwnode pointer.

Implement the fwnode platform_device look-up in drivers core
code by using the bus_find_device() API and a corresponding
matching function. The OF equivalent (eg of_find_device_by_node())
will reuse the newly introduced function when OF code will
take care of setting up the device->fwnode value that is
currently left dangling for platform devices instantiated out
of device tree nodes.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
---
drivers/base/platform.c | 23 +++++++++++++++++++++++
include/linux/platform_device.h | 3 +++
2 files changed, 26 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 6482d47..3ef150d 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -760,6 +760,29 @@ err_out:
}
EXPORT_SYMBOL_GPL(__platform_create_bundle);

+static int fwnode_dev_match(struct device *dev, void *data)
+{
+ return dev->fwnode == data;
+}
+
+/**
+ * platform_find_device_by_fwnode() - Find the platform_device associated
+ * with a fwnode
+ * @fwnode: Pointer to firmware node
+ *
+ * Returns platform_device pointer, or NULL if not found
+ */
+struct platform_device *
+platform_find_device_by_fwnode(struct fwnode_handle *fwnode)
+{
+ struct device *dev;
+
+ dev = bus_find_device(&platform_bus_type, NULL, fwnode,
+ fwnode_dev_match);
+ return dev ? to_platform_device(dev) : NULL;
+}
+EXPORT_SYMBOL(platform_find_device_by_fwnode);
+
/**
* __platform_register_drivers - register an array of platform drivers
* @drivers: an array of drivers to register
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 98c2a7c..01a3eb2 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -276,6 +276,9 @@ extern struct platform_device *__platform_create_bundle(
struct resource *res, unsigned int n_res,
const void *data, size_t size, struct module *module);

+extern struct platform_device *
+platform_find_device_by_fwnode(struct fwnode_handle *fwnode);
+
int __platform_register_drivers(struct platform_driver * const *drivers,
unsigned int count, struct module *owner);
void platform_unregister_drivers(struct platform_driver * const *drivers,
--
2.6.4
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