<apritzel>
junari: if all you need is to bump up the voltage for the DDR rail in the SPL, it should be fairly easy, look at what jernej did back then for the H616
<apritzel>
U-Boot commit fbd37d8d2845
<MoeIcenowy>
apritzel: the document title being wrong seems to be a common situation for AXP datasheets
<apritzel>
MoeIcenowy: well, in this case the 1530 and 313 seem to be only similar, but not the same, as a few rails are slightly different
<MoeIcenowy>
apritzel: my AXP818 datasheet self-identify as AXP288 ;-)
<MoeIcenowy>
(AXP288 is an X-Power for not Allwinner but Intel
<apritzel>
what's the difference between having an AXP for Intel or Arm chips? Just some specific customisation, for typical voltages?
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<MoeIcenowy>
apritzel: in addition AXP288 does not claim RSB at all, only AXP
<MoeIcenowy>
sorry, only I2C
<MoeIcenowy>
and it seems to claim no ACIN
<MoeIcenowy>
only Vbus
<MoeIcenowy>
the regulators inside it looks just the same with AXP81X
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<junari>
apritzel: thanks for info. I followed the jernej's way for voltage set
<junari>
But I ran into something weird
<junari>
In the documentation for dcdc3 rail I can see 33+36 steps. 1200mv should match to 36 step but actually I get something about 950mv. When I read register after vendor spl I get 66 step
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<apritzel>
ah, interesting! did you actually measure the voltage?
<apritzel>
junari: the point is what you observes matches more the AXP1530 BSP rail, that Martin had in its Linux driver: