On 2016/8/15 23:23, Lorenzo Pieralisi wrote:
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@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
---
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);
As SMMU is registered as platform devices, I think we need such
API to retrieve the platform device with fwnode handle, actually
Kefeng introduced a similar patch [1], but your patch is more
generic, so this patch make sense to me,
Reviewed-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Thanks
Hanjun
[1]: https://patchwork.kernel.org/patch/7743661/
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