[RFC PATCH v3 04/13] drivers: platform: add fwnode base platform devices retrieval
From: Lorenzo Pieralisi <hidden>
Date: 2016-07-20 11:27:04
Also in:
linux-acpi, linux-iommu, linux-pci, lkml
Subsystem:
driver core, kobjects, debugfs and sysfs, the rest · Maintainers:
Greg Kroah-Hartman, "Rafael J. Wysocki", Danilo Krummrich, Linus Torvalds
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 <redacted> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <redacted> --- 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,
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2.6.4