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    Subject[RFC PATCH v3 04/13] 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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