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Some triggers can only be attached to the IIO device that corresponds to the same physical device. Implement generic helper which can be used as a validate_trigger callback for such devices. Suggested-by: Jonathan Cameron <jic23@kernel.org> Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com> Link: https://lore.kernel.org/r/51cd3e3e74a6addf8d333f4a109fb9c5a11086ee.1683541225.git.mazziesaccount@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>