Hi, On Mon, Jan 27, 2014 at 4:43 PM, Jyri Sarha <[email protected]> wrote: > On 01/24/2014 07:35 PM, Fabio Estevam wrote: >> >> On Mon, Jan 20, 2014 at 2:48 PM, Russell King - ARM Linux >> <[email protected]> wrote: >> >>> So far so good. Now, what about this external oscillator which has its >>> own separate power control. My immediate thought is that this can be >>> specified via card_ext_clock - I would simply need to declare a >>> fixed-rate >>> clock with either a regulator (power switch) controlled via a gpio (which >>> would probably be closer to the hardware) or a gpio as an enable... ah, >>> that requires me to write a common clock driver for that bit since this >>> is currently not modelled by CCF... >> >> >> Jiry Sarha posted a gpio controlled clock proposal: >> http://www.spinics.net/lists/devicetree/msg16651.html >> > > I have not received too much feedback to my patch yet. CCF is a bit new > territory to me, but I think having a separate stackable clk-gpio would be > more flexible than having the gpio property implemented in clk-fixed-rate.
Not sure where stacking external clocks would be used, but sounds like a fixed factor clock? Maybe you should add DT support to that if that's what you need or have. > Anyway, I am happy do it either way as long as I can get a gpio -controlled > clock implementation into the main line. Cheers, ChenYu -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
