On Tue, Feb 19, 2019 at 03:10:41PM +0000, Gareth Williams wrote:
> From: Phil Edworthy <phil.edworthy@renesas.com>
> 
> The driver requires an undocumented clock property, so detail it.
> Add documentation for a separate, optional, bus clock.

Is it named "bus clock" in the datasheets? If so, then be it, but if
possible, I'd avoid this term because it is ambigious (Is it the I2C bus
or the interconnect bus or...?). pclk sounds more precise to me.