On 2016년 06월 29일 06:18, Michael Turquette wrote:

Quoting Rob Herring (2016-06-28 13:55:18)

quoted

On Fri, Jun 24, 2016 at 01:12:52PM +0900, Jongsung Kim wrote:

quoted

There is no way to set additional flags for a DT-initialized fixed-
factor-clock, and it can be problematic i.e., when the clock rate
needs to be changed. [1][2]

This patch introduces an optional dt-binding named "clock-flags" to
be used for passing any needed flags from dts.

I don't think we want this in DT. If we did, the flags would need some 
documentation about what the flags mean.

Flags are specific to Linux implementation, so I agree with Rob. Better
to create a compatible string for your hardware that bakes in the flags.

Thank you for your comment, Mike. This conversation starts from lacking method to set CLK_SET_RATE_PARENT from DT. I understand compatible string can be a solution. But.. if someone starts talking about lacking method to set another flag, i.e., CLK_SET_PARENT_GATE, then we'll need another compatible string list.
How do you think about defining possible required subset of the flags and using some more neutral flag-names acceptable in DT?