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<
suprothunderbolt >
is the clock issue on A64 properly fixed?
07:43
<
suprothunderbolt >
or at least effectively worked around
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<
LordDoskias >
how do i change the functionality of GPIO pins on A64?
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aalm >
LordDoskias, the same way as on other sunxi boards.
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aalm >
err, s/boards/socs/
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LordDoskias >
aalm, which ?
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<
LordDoskias >
dt overlays or some other, run time way ?
12:46
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aalm >
changing the dt, with or without overlays. personally i've never used dt overlays on anything but rpi.
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aalm >
what kind of a change you need btw.?
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LordDoskias >
i'm looking into pine64A lts board, it has an a64 chip
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LordDoskias >
and some pins have UARTs
12:57
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LordDoskias >
i just want to figure out how to switch from UART to GPIO and vice-versa
12:57
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LordDoskias >
this is generally controlled by the mmio control registers
12:58
<
LordDoskias >
seems pinctrl subsys is exactly for this (i'm new to embedded stuff)
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aalm >
oic, yeah, and it is documented too
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aalm >
LordDoskias, i suggest searching the "user manual" (.pdf) for A64
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LordDoskias >
i read the manual
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LordDoskias >
there are a bunch of mmaped registers that control the various bits
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LordDoskias >
the question is if there is some usual way of doing that
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LordDoskias >
or i have to write the code mmaping the register and settings the bits appropriately
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aalm >
writing your own kernel/os or ?
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<
LordDoskias >
no, no
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LordDoskias >
from linux
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LordDoskias >
from user space
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aalm >
for linux there's the pinctrl driver already
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LordDoskias >
yeah but how do you itnerface with it ?
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LordDoskias >
from user perspective?
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LordDoskias >
is there some utility or just a bunch of sysfs files perhahps?
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aalm >
oh but that's under /driver-api/, so nvm. back to googling:x
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aalm >
(i actually have a usecase too for switching pins between uart&gpio..)
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LordDoskias >
so far what i have found
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<
LordDoskias >
is that it depends on the setup in dt and the pinctrl should switch them
13:36
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LordDoskias >
in this what the dt overlay does is set the given uart4 ode to status okay
13:37
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LordDoskias >
by default status is disabled
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aalm >
mm, i got a simple script giving me "in-place-edits" with vim for .dtb files making .orig-backup in the process, so i can do small changes to the dt with just # sdtc /boot/sun....dtb && reboot
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