Hi Russell, On 18 July 2018 14:19, Geert Uytterhoeven wrote: > On Wed, Jul 18, 2018 at 3:02 PM Russell King - ARM Linux wrote: > > On Wed, Jul 18, 2018 at 01:57:38PM +0100, Phil Edworthy wrote: > > > Behaves the same as (devm_)clk_get except where there is no clock > > > producer. In this case, instead of returning -ENOENT, the function > > > returns NULL. This makes error checking simpler and allows > > > clk_prepare_enable, etc to be called on the returned reference > > > without additional checks. > > > > How does this work with non-DT systems, where looking a clock up which > > isn't yet registered with clkdev returns -ENOENT ? > > > > (clkdev doesn't know when all clocks are registered with it.) > > Good question. > > I guess all drivers trying to handle optional clocks this way are already > broken > on non-DT systems where clocks may be registered late...
So how do non-DT systems that look a clock up which isn't yet registered with clkdev, determine that an optional clock is there or not? Thanks Phil
