On Tue, Nov 13, 2018 at 10:08:22AM +0800, Ryder Lee wrote: > The flag 'has_clks' and related checks are superfluous as the CCF > subsystem does this for you.
Both of these mechanisms aren't equivalent. While CCF can deal with optional clocks, what the has_clks flag actually means is that the device doesn't need a clock (or doesn't have a clock input) on the devices where it is cleared. So I'd actually be in favor of keeping the has_clks property because it serves as an additional sanity check. For example if you run this driver on an SoC that "has clocks" but if you don't list them in DT, then after this patch the driver will happily continue without clocks, even though it may break completely without those clocks. I've seen SoCs respond to disabled clocks for a hardware block in different ways, in many cases an access to any of the registers will completely hang the CPU. In other cases it may just crash in some other way or give you some sort of machine exception. None of those are good, and make the tiny bit of additional code required to support the has_clks flag very attractive. But that's just my opinion. If you prefer to throw away that safety barrier, be my guest. But if you do, please move this functionality into the clock framework first and then make the driver use it. Thierry
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