Query: Clock driver requests mailbox channel

[Leo Yan <leo.yan@linaro.org>]

Hi all,

i'm working with one clock driver, which will invoke mailbox API to
request the mailbox channel and send message.

Usually clock driver will init with devicetree, below is the example:
CLK_OF_DECLARE(hi6220_clk_power, "hisilicon,hi6220-clock-power",
hi6220_clk_power_init);

Clock init function it will pass the pointer of struct device_node
but not the pointer of struct device. So finally it's difficult to
invoke mailbox API *mbox_request_channel()*, due it need use the
struct device to search DT's property "mboxes".

I want to find which is the best way to resolve this issue, so do you
suggest clock driver to manually register one device? Or can we add
one more API to request the mailbox channel directly with device_node?

Welcome any suggestion.

Thanks,
Leo Yan