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<paulk-leonov>
wens: jernej: hi, it looks like axp803 support was submitted to u-boot a couple of times but wasn't merged
<paulk-leonov>
is it needed at all?
<paulk-leonov>
(all a64 boards I see are booting fine without it, so I maybe all defaults are fine?)
<paulk-leonov>
kmaincent ^^^^
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<MoeIcenowy>
paulk-leonov: well in fact something will need non-default things
<MoeIcenowy>
but ATF now does the dirty work for us
<paulk-leonov>
ahh right
<MoeIcenowy>
the only thing that relies on default is DRAM voltage
<MoeIcenowy>
which is usually correct (or at least usable) on A64 boards
<MoeIcenowy>
because SPL boots before ATF
<MoeIcenowy>
on H616 board Orange Pi Zero 2, we got wrong default DRAM vol
<MoeIcenowy>
so it's then needed to tweak DRAM voltage in SPL
<paulk-leonov>
I see
<paulk-leonov>
but I guess board-specific voltage config should in u-boot as well, not ATF?
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<MoeIcenowy>
paulk-leonov: theortically I think so.
<paulk-leonov>
ok, thanks :)
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<MoeIcenowy>
(BTW ATF now tries to read U-Boot control DT\
<paulk-leonov>
nice to see h616 work underway btw
<MoeIcenowy>
(and do regulator configuration according to the DT
<paulk-leonov>
right I've seen that
<paulk-leonov>
so it could also work to just describe it dt then
<MoeIcenowy>
I'm thinking whether to buy a OPi Zero 2
<MoeIcenowy>
(if Xunlong has already finished their vacation
<paulk-leonov>
hehe I have one on its way
<paulk-leonov>
yeah they shipped my package a few days ago
<paulk-leonov>
but not sure I'll have so much time to actually contribute
<paulk-leonov>
I might rather have a go at the new camera subsystem
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<prefixcactus>
speaking of which
<prefixcactus>
my whole deal with sunxi in the workplace weirdly made me want a mostly well-supported sunxi board to play with for myself
<prefixcactus>
Which one would you recommend I get?
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<libv>
prefixcactus: olimex is always a good bet
<prefixcactus>
MoeIcenowy: trying to merge your patch kills my emacs :D
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<libv>
prefixcactus: please do not use manufacturers pictures on our device pages
<libv>
i will have to delete that one
<libv>
please take some pics yourself, most modern cellphones do a well enough job of that :)
<MoeIcenowy>
prefixcactus: are you using emacs on some 640KiB memory IBM PC compatible? ;-)
<prefixcactus>
libv: that one was inserted by apritzel. I wanted to put my own in and actually made it, but decided that the manufacturer's one was better :)
<prefixcactus>
MoeIcenowy: sure, the latest and greatest. Should be more than enough for anyone, right?
<MoeIcenowy>
prefixcactus: well, using the manufacturer image has some copyright problem
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<MoeIcenowy>
please note the foot of any page on linux-sunxi
<MoeIcenowy>
`Content is available under Creative Commons Attribution unless otherwise noted`
<MoeIcenowy>
prefixcactus: did you just try out my branch?
<MoeIcenowy>
I just wonder whether the SPL works or not now
<libv>
prefixcactus: please add your own pics :)
<MoeIcenowy>
(because I'm trying to make it wise
<MoeIcenowy>
the R40 memory initializartion is currently too dumb
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<prefixcactus>
MoeIcenowy: but I need my defconfig and devicetree to make it work on this board :)
<prefixcactus>
well, just the defconfig, but still
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<prefixcactus>
MoeIcenowy: er, the compilation fails with:
<prefixcactus>
my experience with submitting patches is "I've read the kernel's guide to patch submission"
<apritzel>
(in the Linux tree)
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<apritzel>
bloody lazy Github, chickening out on displaying the whole of arch/arm/dts
<prefixcactus>
hehe
<apritzel>
(for the records, it's the "..." button in the diff view, then "View file")
<prefixcactus>
oh, apparently I forgot to stage the new .dtsi
<apritzel>
prefixcactus: ah, I just started to wonder where it ended up ...
<apritzel>
prefixcactus: the .dts file looks OK, I have some smaller comments, but we can have this discussion on the list
<apritzel>
prefixcactus: you can delete the whole license text and replace it with "// SPDX-License-Identifier: GPL-2.0+ OR MIT" at the very top
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<apritzel>
plus add your own Copyright line. If you copied and want to give credit, you can use (after your line): "Based on the ....dts, which is\n\tCopyright ..."
<prefixcactus>
so, remove the whole thing, put the SPDX line, and my own copyright line under that?
<prefixcactus>
apritzel: also, could you please clarify how to post a Tested-by for MoeIcenowy's patch? Is the patch already there and I should write somewhere to add the line, or do I just drop it here so that he/she could include it, or what?
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<apritzel>
MoeIcenowy: did you post the patches to the U-Boot list? I don't see anything. There is the asymmetric dual rank patch posted by someone else, but not the R40 dual rank patch
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<MoeIcenowy>
apritzel: not yet
<MoeIcenowy>
I will push it now
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<MoeIcenowy>
apritzel: pushed
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<jernej>
paulk-leonov: axp803 (and others not yet implemented) drivers would be actually very useful in U-Boot, but only if they use DM regulator framework
<jernej>
current approach is to set voltages in SPL, but some 64-bit SoCs don't have much space there
<jernej>
additionally, DM driver would allow a bit more fine tuned control
<paulk-leonov>
jernej: how would that play out with ATF then?
<jernej>
why would there be a problem with ATF?
<jernej>
current approach in ATF works on most board, but on some causes issues, like OrangePi 3
<jernej>
of course, Linux driver could do full reset to avoid that, but then again, some regulator might be enabled even if no needed (can't give you example right away, but it can happen=
<jernej>
apritzel: do you know if anyone works on more featureful U-Boot clock driver?
<apritzel>
jernej: not that I know of
<jernej>
it would be much easier to decouple TCON code to standalone driver for DE2 if clock rate could be set through DM clock framework
<apritzel>
jernej: yes, but please keep it simple ;-)
<jernej>
which part?
<apritzel>
jernej: I mean don't port the Linux driver and its structures over
<jernej>
first, I'm not sure I have motivation to do anything about clocks yet
<apritzel>
it should be fairly straight-forward to just move the existing clock setter code (like clock_set_pll10) into the DM file
<apritzel>
I can give it a try
<apritzel>
so far there was no real need
<jernej>
second, it's not simple, so even if first solution may be simple, it can get more complicated and starts to look much like Linux driver over time
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<apritzel>
but we won't need all of those clocks in U-Boot, will we?
<jernej>
no, but video related clocks are unfortunately on more complicated side, especially with interdependencies
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<jernej>
still, it's easier than on Linux
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<jernej>
minimum that it's needed is PLL rate set with min and max allowed rate, allowing to set parent rate or not (flag) for module clocks
<jernej>
LCD panels might be more complex, but I have no experience with them
<apritzel>
jernej: I was hoping that for U-Boot's purpose the setup would be rather static, so there would be no reparenting or the like, just a fixed mux setting, and then adjusting the dividers or PLL parameters
<jernej>
you might get away with fixed parents - but note that defaults are not always good
<jernej>
but cetainly there is a need to find best dividers across module clock and PLL (check how video clock setup works)
<apritzel>
jernej: yes, the plan was to set the parent (and other fixed parameters) when clk_set_rate() is called
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