On Tue, May 30, 2017 at 11:50:41PM +0200, Alexandre Belloni wrote: > Hi, > > This series reworks the Atmel Timer counter Block drivers. Those blocks > each have 3 counters with 2 channels each and can be used for > multiple functions: > - timers > - PWMs > - Quadrature decoders > - Stepper motor counters > > Up until now, each TCB was fully used by each driver, possibly wasting > counters/channels. > > There is a second issue motivating that rework. Until now, the PIT is > still used to boot then later in the boot sequence, the clocksource is > switched to the TCB. This ends up not working well with preempt-rt > because on some SoCs, the PIT interrupt is shared with the DBGU uart. > When using preempt-rt the interrupt flags for the PIT and the DBGU end > up being incompatible. > > The rework breaks the DT ABI. Backward compatibility can be kept by > keeping tcb_clksrc and atmel_tclib but as AVR32 is now gone from the > kernel, I don't think it makes much sense to keep them. > > Also, there is no other choice than breaking the mainly unused > pwm-atmel-tcb binding. Only the kizbox is actually using it. > > I think the bindings are now ok and I hope we can take the DT changes > for 4.13. Has anyone volunteered to pick this up? What are the dependencies here and how did you plan to get this merged? Thierry
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