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<guest_1234>
Hello
<guest_1234>
I've got a question regarding OTG PHY: how to find out which PHY controller has been used in R40 SoC and where to find the documentation for it?
<guest_1234>
In Mentor spec there is info that there is some spec: musbhdrc_ulpi_an.pdf but I cannot find it in the net
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<wens>
behind NDA maybe?
<guest_1234>
NDA - I have not any - so seems I will have to analyse linux driver sources
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<ElBarto>
wens: you might have better chance using the mailing list for ipfw question
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<paulk-leonov>
I changed my lamobo-r1 ddr freq from 432 MHz to 408 MHz because it was showing some "Unable to handle page request" errors, and now they're even more frequent
<paulk-leonov>
how strange
<paulk-leonov>
should I try an even lower frequency?
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<diego71_>
paulk-leonov: u-boot default was 384Mhz for many boards.
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<diego71_>
and 360 Mhz it's considered a fine choice if you're in doubt :)
<paulk-leonov>
diego71_, alright, I'll keep that in mind
<paulk-leonov>
anyway my issue definitely seems related to dram clock
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<KotCzarny>
paulk-leonov: my bpi-r1 runs fine on default
<KotCzarny>
not doing heavy work, but not idle neither
<paulk-leonov>
KotCzarny, on 432 MHz, it tended to show the same fault on heavy disk access or so
<KotCzarny>
i'm using mine as a nfs server and didnt trigger any issues
<KotCzarny>
i should update my kernel tho, still on 4.9.0
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<guest_1234>
A question about USB OTG: if I'm planning to write simple usb device driver - should I touch ULPI/UTMI PHY registers or not?
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<paulk-leonov>
guest_1234, probably not
<paulk-leonov>
if you're working on a usb device driver, it should be independent of the platform and use the USB API
<guest_1234>
so if I understood you properly - the Mentor USB dual role controller should do all the things properly?
<guest_1234>
but I'm trying to write USB device driver for MUSB in R40
<guest_1234>
I mean low-level driver - which talks with MUSB on the register level
<wens>
dont reinvent the wheel
<wens>
it's the same hardware. port an existing driver
<guest_1234>
I could, but I'm trying to do as much as possible by myself, to gain some experience before I get some serious task to port uboot/linux to new embedded board
<KotCzarny>
porting existing driver is a task in itself
<KotCzarny>
you will be learning innards anyway
<guest_1234>
but doing it from scratch will give me more knowledge and experence, I think so
<guest_1234>
but I may be wrong in my opinion of course
<wens>
learning from existing code is better
<wens>
and pick something other than the really broken musb
<wens>
there are only register defs. for allwinner stuff
<wens>
it says nothing about how the hardware is supposed to work, how the software should configure it, or what responses to look for
<guest_1234>
oops, broken? I didn't know...
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<guest_1234>
I'm afraid that most of the usb controllers don't have the proper docs and info how to configure it. As I remember drivers for UHCI and OHCI weren't easy to write to me
<guest_1234>
just as you said - nobody knew how to configure it
<guest_1234>
most of work was to use trial and error method :/
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<Net147>
mripard: my LCD no longer turns on after applying LVDS patchset from linux-next
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