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<qschulz>
tlwoerner: i'm trying to get the PHY id from U-Boot on RK3588 as well
<qschulz>
tlwoerner: never works when I call get_phy_id, similarly `mii info` also always returns zeroes
<qschulz>
tlwoerner: I'll be most likely giving up on this because I only need the PHY clock to be running for the Linux kernel to find the proper PHY for me
<qschulz>
tlwoerner: FYI, once the PHY is probed by some parts of the code in U-Boot, the phy_id is cached for each mdio bus address, so you can access it without get_phy_id
<qschulz>
overrides board_phy_config, where you have direct access to the phy_device structure
<qschulz>
but this only called when the phy is initialized
<qschulz>
(which it isn't as part of the default/normal boot process until reaching U-Boot cli
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<qschulz>
i also had to remove the if check in *eth_phy_get_mdio_bus, I don't understand why it's there
<marex>
qschulz: that get_phy_id , are you sure it enabled all the clock ?
<marex>
qschulz: I think I had this problem with DWMAC on STM32MP15xx , it didnt enable some internal EQoS/DWMAC clock and the mii command returned all zeroes or ones or something
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<qschulz>
marex: PHY clk and PHY reset are proper, didn't check the MAC clk
<marex>
qschulz: since the MAC interacts with the MDIO bus, you might want to check that too
<marex>
qschulz: maybe check the MDIO clk line with a scope and measure the frequency too, if it is too high, the PHY might go nuts too
<qschulz>
yeah but the whole thing is way too involved for what I need to do
<qschulz>
U-Boot currently always do PHY negotiation when starting
* marex
rolls eyes
<qschulz>
I don't need any of that
<marex>
eh ?
<qschulz>
in order for the PHY to be properly configured, you need to call its phy_startup function AFAICT
<qschulz>
and this always does link negotiation
<qschulz>
which is overkill when I literally only want its PHY ID
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<marex>
qschulz: ah, uh ... this horrorshow ...
<marex>
qschulz: the crappy thing about reading out PHY ID is that you may have to do whatever weird power sequencing for the PHY before you can access its registers
<marex>
cfr LAN8710 :(
<marex>
and to figure out what weird power sequencing you have to do , you need the PHY ID , so this is circular depenency
<marex>
that's why it is often a better idea to put the PHY ID into DT and be done with it
<marex>
there have been many discussions about this on netdev@ too
<qschulz>
Yes, and this is where I am coming from
<qschulz>
we can NOT have the PHY ID in the Device Tree
<marex>
uh
<qschulz>
because we can place two different ones in HW
<qschulz>
so I need to support both
<marex>
qschulz: do you have any way of telling the boards apart , other than reading out the PHY ID ?
<marex>
qschulz: hold on, I did this nasty hack ...
<qschulz>
no
<marex>
see 32a41b7c378
<qschulz>
I mean, we have an empty EEPROM right now, but I'd rather do something that doens't involve it
<qschulz>
because... well, then you have to make sure they are coherent :)
<marex>
qschulz: I misused property of the board, one has a pull up on one of the PHY lines, the other doesnt
<qschulz>
marex: AFAICT from the schematics, we have only one resistor value changed, and it's not routed to anything on the SoC side, so not an option
<marex>
qschulz: oh well :(
<qschulz>
so for the net PHY subsystem to be able to detect our PHY properly, we need to have the PHY clock running, that's all
<qschulz>
so I'll just force-enable the PHY clock before booting the kernel I guess
<marex>
qschulz: what about networking in uboot ?
<qschulz>
and then the day this makes me not sleep at night anymore, I may work on making this prettier
<marex>
qschulz: can you do MDIO GPIO bitbang btw ?
<qschulz>
marex: somehow it works without doing anything special, i'll need to dig a bit to understand stuff
<marex>
that way you might avoid dealing with the MAC clock
<qschulz>
marex: it's not the MDIO, it's the clock for the PHY
<qschulz>
ah, I see what you mean
<qschulz>
whew, not sure I want to go this route, but that may be an option indeed
<qschulz>
thx for the pointer
<marex>
qschulz: sure
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<tlwoerner>
qschulz: just to be clear, i'm trying to get it on a rk3328 (rock-pi-e)
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<qschulz>
tlwoerner: yeah I gathered, but the hoops to go through would probably be the same
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<tlwoerner>
qschulz: yes, your description of what you're seeing sounds very familiar
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<tlwoerner>
curious. the older rock-pi-e boards, with the 8211e PHY, _appear_ to have networking working (because initialization completes successfully)
<tlwoerner>
but on closer examination, networking is not working on that board either
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