firmware: raspberrypi: Provide a helper to query a clock max rate
The firmware allows to query for its clocks the operating range of a given clock. We'll need this for some drivers (KMS, in particular) to infer the state of some configuration options, so let's create a function to do so. Acked-by:Stephen Boyd <sboyd@kernel.org> Reviewed-by:
Florian Fainelli <f.fainelli@gmail.com> Signed-off-by:
Maxime Ripard <maxime@cerno.tech>
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