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A significant number of RaspberryPi drivers using the firmware don't have a phandle to it, so end up scanning the device tree to find a node with the firmware compatible. That code is duplicated everywhere, so let's introduce a helper instead. Acked-by: Florian Fainelli <f.fainelli@gmail.com> Link: https://lore.kernel.org/r/20220815-rpi-fix-4k-60-v5-1-fe9e7ac8b111@cerno.tech Signed-off-by: Maxime Ripard <maxime@cerno.tech>