ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<tlwoerner>
mmind00: i'm trying to investigate ways that the rock-pi-e could autodetect in u-boot whether or not it is an older model and therefore has the rtl8211e or a newer model with the rtl8211f chipset
<tlwoerner>
my hope was that i could do something in, say, early_board_init_f() to fixup the device-tree if the f variant was detected
<tlwoerner>
the most certain way would be to read the realtek id register, which says whether it's the e or the f variant
<tlwoerner>
but i can only access that register if the net/phy interface is already initialized since that id register is behind a on-device paging mechanism
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<CounterPillow>
If the on-device paging mechanism is anything like in the motorcomm phy I touched once then a hacky solution to just flip to the right page, read the reg, and flip back to leave hardware in a known state is probably the least painful solution, even if it's icky.
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<mmind00>
tlwoerner: I vaguely remember your phy-patch, but not details anymore, sorry ... was the phy just missing a clock to be detected or did some gpio change?
<mmind00>
tlwoerner: but I haven't touched u-boot for a while now ... though wouldn't you need to fixup the dt you want to pass to the kernel?
<tlwoerner>
mmind00: a new spin of the rock-pi-e board exists that changed the phy, i sent a patch that would work on the new revision but not on older ones
<mmind00>
tlwoerner: I remember there were special places in uboot for dt-fixups (also doing reserved memory and such), before it gets passed to the kernel
<tlwoerner>
so the suggestion was, as is my understanding, detect the board revision in u-boot and fixup the dt
<tlwoerner>
yes
<mmind00>
tlwoerner: exactly ... I ran into a similar problem recently ... where the phy needs a clock to run to get detected at all ... and network people strongly suggested that all of that (setting a full phy-id) should be done in the bootloader before the dt gets passed to the kernel
<tlwoerner>
mmind00: that's the chicken-and-egg issue i seem to be facing. in order to flip pages and read registers in the phy, it has to be running, but in order to run it has to get its configuration from dt
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<CounterPillow>
yolo it in the board setup, if it fails you know you've got the wrong one and can retry (if the hardware didn't let any magic smoke escape)
<mmind00>
tlwoerner: that would be my suggestion as well ... from the patch https://lore.kernel.org/all/20231221062244.11871-1-twoerner@gmail.com/ it looks like only really the delays are different? That shouldn't prevent the phy from starting up to at least read one of its registers
<CounterPillow>
hell the longer reset assert/deassert probably works for both variants
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<tlwoerner>
pfft, upstream u-boot doesn't have networking working for the rock-pi-e
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