dt-bindings: reset: document Broadcom's BCM4908 PCIe reset binding
BCM4908 was built using older PCIe hardware block that requires using external reset block controlling PERST# signals. Signed-off-by: NRafał Miłecki <rafal@milecki.pl> Acked-by: NFlorian Fainelli <f.fainelli@gmail.com> Reviewed-by: NRob Herring <robh@kernel.org> Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
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