On Mon, Feb 15, 2016 at 9:59 PM, Andre Przywara <andre.przywara@xxxxxxx> wrote: > Hi Hans, > > .... > >> >> p.s. >> >> I love the work you've been doing on the A64, I've not had a chance >> to try it out yet though. Have you made any progress with getting >> the mmc slot to work ? If not maybe I can make some time I've >> prior experience in bringing up the mmc slot on other Allwinner SoCs > > Thanks for that! > > So we made some progress on the weekend (with the help of #linux-sunxi): > 1) The regulator node was stupidly put by me into a separate child node > without putting address and size cells into. So I just moved it into > /soc directly now and that seems to fixed the missing regulator. > 2) The reset node is a allwinner,sun6i-a31-ahb1-reset, which does not > get registered automatically, but by an explicit call from mach-sunxi/. > I wonder why we do this (yes, I saw that comment, but still...) and if > it would work with a normal MODULE_DEVICE_TABLE() declaration. > There is and will be no equivalent to the mach- directory on arm64. On sun6i, we supported the high resolution timer, which had a reset control. Timers (or clocksources) are registered before device model kicks in, so the reset had to be explicitly registered before the timer, or the system would hang. I think we phased that out though. Maxime should know. ChenYu > 3) As Jens pointed out, the MMC IP block isn't really compatible. > Changing the clocks is easy (done already), but we need to come up with > code to cover the new phase setting registers in the A64 MMC register block. > > Interestingly somehow hacking this (pretending it is compatible) seems > to work, though I got reports from people about mysterious kernel > crashes, so I'm inclined to leave MMC out of the first patch series. > > So if you could take a look at the new registers (starting at offset > 0x140) and work out what we actually need to do here, that would be > great. I have no real clue about what they actually do and how they > relate to the current output and sample clock phase. > To me it looks like we might get away with just triggering the automatic > calibration and the hardware does the rest for us - keep your fingers > crossed ;-) > > Cheers, > Andre. > > -- > You received this message because you are subscribed to the Google Groups "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscribe@xxxxxxxxxxxxxxxx. > For more options, visit https://groups.google.com/d/optout. -- 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
