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platform: Add platform_find_device_by_driver() helper

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Provide a helper to lookup platform devices by matching device
driver in order to avoid drivers trying to use platform bus
internals.

Cc: Eric Anholt <eric@anholt.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Sandy Huang <hjc@rock-chips.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20190723221838.12024-8-suzuki.poulose@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose
2019-07-23 23:18:38 +01:00
committed by Greg Kroah-Hartman
parent 6bf85ba9e5
commit 36f3313d6b
6 changed files with 23 additions and 12 deletions
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14
drivers/base/platform.c
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@@ -1197,6 +1197,20 @@ struct bus_type platform_bus_type = {
};
EXPORT_SYMBOL_GPL(platform_bus_type);
/**
* platform_find_device_by_driver - Find a platform device with a given
* driver.
* @start: The device to start the search from.
* @drv: The device driver to look for.
*/
struct device *platform_find_device_by_driver(struct device *start,
const struct device_driver *drv)
{
return bus_find_device(&platform_bus_type, start, drv,
(void *)platform_match);
}
EXPORT_SYMBOL_GPL(platform_find_device_by_driver);
int __init platform_bus_init(void)
{
int error;