media: rcar-csi2: Negotiate data lanes number
Upstream https://patchwork.linuxtv.org/patch/64675/ Use the newly introduced get_mbus_config() subdevice pad operation to retrieve the remote subdevice MIPI CSI-2 bus configuration and configure the number of active data lanes accordingly. In order to be able to call the remote subdevice operation cache the index of the remote pad connected to the single CSI-2 input port. Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
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