<suprothunderbolt>
I'm not sure I understand this process, when things are submitted to this dri development list, do they then appear in the mainline kernel or is there another staging area I could checkout?
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<suprothunderbolt>
or is the approach to find the patches on patchwork?
<megi>
you can check linux-next for patches queued up for next linux kernel release (in this case 5.6)
<smaeul>
even though the DT patches are in sunxi-next
<megi>
it will usually all be integrated in linux-next/master
<suprothunderbolt>
smaeul: Thanks for explaining it! I was just hunting around thinking oh only the DT part has been merged!
<suprothunderbolt>
i was having a problem with the previous patches the sometimes the panel wouldn't start up... and it seems intermittent so I thought I'd check if the more recent patches just fix it before spending time trying to work out what's going on
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<suprothunderbolt>
new patches appear to work! Thanks smaeul and megi. The new I2S TDM patches don't so I'll just run my old version of i2s...
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<mripard>
suprothunderbolt: can you report on the ML what is not working?
<suprothunderbolt>
yeah, If I can work it out, I think it's the interaction with the codec I'm using
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<damex>
would it be realistic to expect h5 boards to work with 1.5-2a? microSD + ethernet is all that is externally connected. no load on GPU planned.
<mru>
2A at what voltage?
<karlp>
"fine"
<damex>
mru: 5v/2a
<damex>
well, i am trying to pick a decent 'desktop' charger to power 4 boards, maybe 5 boards at the same time.
<KotCzarny>
just buy dedicated psu
<KotCzarny>
single or dual voltage one
<damex>
uh... like what?
<KotCzarny>
meanwell rs-50-5
<KotCzarny>
or rd-65b i think
<damex>
i can pick 60 or 63w anker 'portport speed 5 or 5 pd' which can do 2.4a per port but exhausting all ports won't let 2.4a happen
<KotCzarny>
psu, not a charger
<damex>
oh... sadly meanwell is pretty hard to get here in Kazakhstan :(
<KotCzarny>
how about aliexpress?
<damex>
well, i originally planned getting that charger from aliexpress. aliexpress is doable/accessible. is there a way to spot original/fake one?
<KotCzarny>
only reviews, unfortunatelly
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<damex>
what is bad about getting charger with enough juice and using usbA -> microUSB cables to power boards?
<damex>
bad or wrong
<KotCzarny>
charger relies on device having power regulation
<KotCzarny>
and can be noisy a lot
<KotCzarny>
and not keeping voltage straight
<karlp>
boards _should_ be accepting that anyway.
<KotCzarny>
psu is usually made to hold the voltage for the given amps range
<karlp>
so is a usb charger?
<KotCzarny>
ya, and make the owners wtf about 'why did that sdcard no booot'
<KotCzarny>
having 12V at the psu is nice for plethora of reasons
<KotCzarny>
and lowers number of required power bricks
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<karlp>
(unless you just want to power a bunch of 5v devices, then it's just surplus "for later")
<KotCzarny>
lots of devices use 12v
<karlp>
given damex's questions, I kinda feel they just want to power a bunch of specific boards they were going to use usb cables with, so, yeah, maybe, but maybe also not :)
<KotCzarny>
but handy even to power 3.5" hdds
<karlp>
that's totally outside the specified problem realm :)
<KotCzarny>
agreed on the use case
<KotCzarny>
but he didnt state any
<karlp>
all we've got is, "I want to use a a bunch of 5V usb ports to power ~5 boards"
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<willmore>
phone chargers often have poor voltage regulation (noisey, spikes, etc.) as they're mean to charge batteries which just don't care about such things. SBCs do care about that.
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<willmore>
If you're completely familiar with the power circuitry on the particular SBC and are confident that it can tolerate the output of a phone charger, then feel free to use one. But I would not be comfortable making a blanket assertion that phone chargers are fine for all SBCs.
<willmore>
I would really like to encourage SBC vendors to use chips with a wider voltage range on the front ends of their power circuitry.
<karlp>
if they've designed ones with usb ports, I consider them to have failed if they're nto accepting common charger behaviour :)
<willmore>
12V is really handy as it's readily available and currents will be a good deal less than they would be at 5V. 19V is wonderful as there's tons of cheap laptop bricks for that voltage.
<willmore>
karlp, oh, I agree, but there's a lot of failed boards out there. ;)
<willmore>
Look at the RPI boards.
<karlp>
I'd way rather have a usb cable from a usb outlet than go leaving 19V laptop bricks all over the place
<willmore>
Those things freak out if the input voltage drops under 4.75V.
<KotCzarny>
anyway, phone chargers are often the reason of failed mmc controller reads/writes
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<montjoie>
sun8i-ss prng on the way!
<willmore>
montjoie, you rock!
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<montjoie>
prng is easy, I fear the trng
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<montjoie>
oh the TRNG seems to work out of the box
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<damex>
willmore: so usb chargers 'with better implementation' has to be used in that case? i have had enough of extra bricks and all up for convenience. meanwell does not seem like a solution i am ready to opt for
<willmore>
Then it looks like they'll be fine with a usb charger type of supply as long as the cables are good enough.
<willmore>
The power circuitry should have decent filtration and regulation. 5V in is only passed through to HDMI and USB host. All other voltages go through regulators.
<willmore>
If you're powering a lot of boards in a small area, one large supply is generally a superior idea, but if they're spread around, then you don't have much choice.
<damex>
as for the cables - i plan to stick to ugreen and anker 25cm and 3a rated usbA -> microUSB cables
<willmore>
Shorter and thicker are better.
* willmore
is not an Anker fan
<damex>
willmore: boards is gonna be stacked using brass or nylon standoffs
<damex>
willmore: well, anker seem like a decent solution when you need to choose something :)
<willmore>
I'll propose another solution for you.
<damex>
Sometimes the only choices you have are bad ones, but you still have to choose (c) Capaldi as The Doctor
<willmore>
For the cost of all of those chargers and cables, you may wish to go with the unified 5V supply and power the boards directly over the GPIO headers.
<KotCzarny>
so, meanwell rs-50-5 it is
<KotCzarny>
;)
<KotCzarny>
(single voltage)
<willmore>
Looking at the schematic, they lack any input voltage protection over the GPIO--which is completely normal.
<willmore>
You just have to be very careful you wire things properly--color code things, etc. Don't let a monkey play with it....
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<willmore>
As much as I want to give them credit for putting input protection on the 5V input (polyfuse and a reverse voltage diode), it's fron an inherently polarized connector! If it were a barrel jack or something that could be wired a number of ways, I'd forgive them, but it's a freaking micro-USB connector!
<willmore>
Unless you made your custom power cable or got some charger that was completely backwards, those components are simply a waste.
<willmore>
Should have put a polyfuse to the GPIO (and kept the reverse diode).
<willmore>
KotCzarny, yeah, I'd strongly recommend using a supply like that and GPIO wiring for this application. micro-USB is just too unreliable for this application.
<willmore>
Looks like there are polyfuses on the USB ports as well, so if you use GPIO for input a short on the USB won't burn the board up. That's good.
<KotCzarny>
so meanwell + bunch of microusb leads
<KotCzarny>
:>
<KotCzarny>
with optional diodes on them
<willmore>
KotCzarny, no, meanwell + bunch of 0.1" headers to go to GPIO.
<KotCzarny>
that could work too
<willmore>
I would recommend getting a 2x5 shell and using both 5V pins and two GND pins. That will ensure a solid connection--any connector will have noise as the two mating surfaces move against each other--which happens even in stationary applications, thermal expansion is a thing.
<willmore>
And the caps on the board will filter out most of that, but using redundant contacts is always better.
<damex>
2x5 shell?
<willmore>
Yeah, the data I'm seeing says that a single dupont cable has a max current of 3A and that's for name brand connectors installed perfectly. I'd safely say 2A or 1.5A is a more practical limit. That makes two in parallel sound even better.
<willmore>
damex, are you familiar with 0.1" headers?
<damex>
willmore: well, 2.54 header that is used on gpio/serial/etc, yeah
<willmore>
yes, those.
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<willmore>
If you used a two row 5 long connector (2x5) you would fit over the end of the 40pin GPIO connector where the two 5V pins and two GND pins are.
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<willmore>
You only need to put in pins for the four wires you would need. You can leave the other ones empty.
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<damex>
yeah, sounds reasonable, never liked separate pins over gpio header unless you need to connect it just once :/
<willmore>
They're power, so we'd want them in proper connectors and putting them in the big shell helps make sure they won't be connected to the wrong pins.
<willmore>
Shells are cheap as are the connectors. The crimp tools are cheap as well.
<willmore>
damex, no, KotCzarny agrees that you only need the single 5V one. How many of these boards do you expect to have?
<damex>
willmore: plan to start with 5 of them.
<willmore>
They spec 2A (which is way more than you'll be using by just running the CPU.) so that's 5x2A or 10A. Look for a 50-60W supply.
<willmore>
damex, the RS-50-5 looks to be enough for what you're doing now.
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<willmore>
It's 10A (50W) max. I don't know their product line specifically, but most supplies of this type need some cooling when you get above about 2/3 of their capacity. You'll probably want some for the boards anyway, so that shouldn't be an issue.
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