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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<dougg3>
is anyone else out there using tty/serial/8250/8250_pxa.c or tty/serial/pxa.c? 6.9 broke pxa.c for me on PXA168 (already bisected it). that driver is marked as deprecated so I thought I'd try 8250_pxa instead. 8250_pxa behaves even worse -- drops tons of TX characters, even on older kernels. I'm wondering if it's just a PXA168 thing, or if it's totally broken for everyone...
<ukleinek>
(only a side quest, I'm debugging why perf doesn't show symbols for me, enabling PROC_KCORE is possible on ARM, but doesn't help)
<arnd>
ukleinek: I have no idea, you need to ask rmk about that one
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<conchuod>
broonie: I got sent some patches for a spi driver that doesn't implement transfer_one_message() that introduces fiddling with the chip select in transfer_one() to work around some "unfortunate" controller behaviour. I would imagine that that is grounds for just implementing transfer_one_message() instead of transfer_one()?
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<broonie>
Probably, yes. Depends on what exactly the bodges are.
<conchuod>
broonie: That's the main bodge, but there's other changes trying to avoid other disables (e.g. for the per-xfer setting of the clock rate)
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<broonie>
That's probably fine yeah.
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<conchuod>
broonie: cheers
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<krzk>
geertu: yes :), because various people hang out in different bars and the question should be directed to all, not only to me.
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<pivi>
krzk: next time I meat you at a bar I will ask you about device tree (that is probably what I did for real when it happened ;-)
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<dougg3>
ukleinek: definitely, I have a feeling I might be the only one. I was mostly thinking about all the other PXAxxx devices out there, wouldn't want to break them while fixing mine...
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<ukleinek>
dougg3: I might be wrong, but maybe linusw__ still uses pxa??
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<linusw__>
ukleinek: no but I think there are other users. Mark Brown used one specimen for a long time but maybe not anymore.
<broonie>
It's been a very long time since I had mainstone/zylonite, and wolfson threw them out which was annoying :(
<broonie>
I do have some Zaurus devices but they're not sensible for development.
<dougg3>
how likely is it that if 8250_pxa misbehaves on PXA168, it also misbehaves on the other PXA devices?
<ukleinek>
broonie: how does regmap caching work? Writes are always performed and only reading is served from the cache?
<broonie>
ukleinek: Yes (modulo volatile/cache not present yet).
<ukleinek>
broonie: it would help me if writes would also be skipped if they match the cache. Is regmap the right layer to address that, or should I adapt the driver using regmap (here: pca953x)
<ukleinek>
?
<broonie>
If you want to do that use regmap_update_bits()
<broonie>
It will suppress a noop write.
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<ukleinek>
broonie: thanks
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* ukleinek
now only needs regmap_bulk_update_bits()
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<pinchartl>
am I missing something, or is there no generic DT property to set the voltage of a regulator, in a similar way to the assigned-clock* properties ?
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