#linux-sunxi on 2022-07-31 — irc logs at oftc.irclog.whitequark.org

2022-03-22 11:56 ChanServ changed the topic of #linux-sunxi to: Allwinner/sunxi development - Did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait for an answer! - This channel is logged at https://oftc.irclog.whitequark.org/linux-sunxi

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10:37 <rm_> hello

10:38 <rm_> I have a mini-USB female port on my A20 board, it doesn't work as host when connected with an USB-A adapter

10:38 <rm_> /sys/firmware/devicetree/base/soc/usb@1c13000/status = disabled

10:38 <rm_> /sys/firmware/devicetree/base/soc/usb@1c13000/dr_mode = otg

10:39 <rm_> I believe it could be this one

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10:39 <rm_> any way to switch that to "enabled" and to "host" from a running system, without editing the DTB?

10:44 <hramrach> doesn't disabled mean that it's just completely disabled?

10:46 <hramrach> if we had general ovelay loading intrface you should edit the DT but there is some resistance to making DT useful in Linux upstream that I don't really understand

10:47 <hramrach> yes, randomly editing the DT can make your board explode (if it has batteries) or at least burn down, and some drivers holding references to DT nodes that get removed can crash the kernel

10:48 <hramrach> and the result onf not alloing changes to DT in the krnel? People make random changes to DT, install that changed DT *permanently*, and reboot. Significantly decreases options for recovering from nalfunction.

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10:51 <rm_> yeah it is also seems like a mess that u-boot and Linux have separate differing DTs

10:53 <hramrach> so without more detailed information it's hard to tell if that USB port is what's connected to that connector, and what would emabling it do.

10:55 <hramrach> for CPU pins directly connected to external connector you could enable the GPIO function and check if the voltage changes when you change the GPIO state but for USB the pins are likely connected through some additional peripherial so it's not so easy

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11:15 <jernej> rm_: no, U-Boot uses DT from Linux, it's just usually slightly out of date and syncs are done now and then

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