On 25/07/2017 at 17:44:19 +0200, Nicolas Ferre wrote: > On 25/07/2017 at 09:37, Quentin Schulz wrote: > > This patch series adds support for the audio PLLs and enables ClassD that > > can be found in ATMEL Sama5d2 SoC. > > > > There are two audio PLLs (PMC and PAD) that shares the same parent (FRAC). > > FRAC can output between 620 and 700MHz and only multiply the rate of its > > parent. The two audio PLLs then divide the FRAC rate to best match the > > asked rate. > > > > I basically took an old patch series posted by Nicolas on December, 6th > > 2016[1][2][3] and the comments Boris did on the first version[4] Nicolas > > sent on July, 15th 2015. > > > > I also fixed the function used to compute the divisors, removed useless > > spinlocks and added a range to the audio frac PLL to stay within vendor's > > supported range. Clocks that are children of gclk (generated-clk) are now > > able to propagate rate to the audio PLL clocks when needed. > > > > However, there are multiple children clocks that could technically > > change the rate of audio_pll (via gck). With the rate locking introduced > > in Jerome Brunet's patch series[5], the first consumer to enable the clock > > will be the one definitely setting the rate of the clock. Without the rate > > locking, the last consumer to set the rate will be able to mess with the > > rate. > > Since audio IPs are most likely to request the same rate, we enforce > > that the only clks able to modify gck rate are those of audio IPs. > > > > To remain consistent, we deny other clocks to be children of audio_pll. > > Quentin, > > Thanks for having revived this series. Everything's okay on my side for > this v4. I think that my tag isn't missing from any patch of this > series. Now we surely need to define which path it must take... > I'll take the two dts patches now as the bindings have been acked. Everything else should probably go through the clk tree. -- Alexandre Belloni, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
