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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<geertu>
So my comment was wrong: it was truncated to (signed) int
<ukleinek>
geertu: I wrote: "Another side effect is that values bigger than INT_MAX for period and duty_cyle are not wrongly discarded any more." which I consider to cover that issue.
<geertu>
ukleinek: Bummer. Please ignore my comment.
<geertu>
Sorry for the fuzz.
<ukleinek>
geertu: no problem, my question was honest, I just wanted to prevent me not catching a joke :-)
<javierm>
geertu: but thanks for the confirmation, then I know that shouldn't wait for your R-b :)
<geertu>
javierm: I'm send one right now...
<geertu>
sending
<javierm>
geertu: great, thanks!
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* wens
sent a bulk edit patch that was too large for the mailing lists ...
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<milkylainen>
Does anyone know if there is someone on IRC to ask about the Intel IGB ethernet nic driver, rather than just the netdev list?
<milkylainen>
The osuosl list didn't generate anything useful. :\
<krzk>
Hi all, anyone knows the Kconfig trick for not allowing another symbol to be a module, if I am not a module? IOW, (CONFIG_XXX=y => CONFIG_YYY=y|n) && (XXX=m => YYY=y|m|n)?
<javierm>
krzk: on XXX Kconfig definition have depends on YYY=y || (YYY=m && m) maybe ?
<javierm>
krzk: I see in that thread that select was used, that will also make sure that the selected symbol matches the tristate, i.e: CONFIG_XXX=y selects CONFIG_YYY={y,m}
<krzk>
javierm: yes, but I want to be able to disable the YYY as well. select does not allow that.
<javierm>
krzk: then I think that a depends on in the reverse direction but with =y || (=m && m) should do it
<javierm>
that is, instead of making XXX select YYY make YYY depend on XXX=y || (XXX=m && m)
<krzk>
javierm: depends on USB_ROLE_SWITCH=y || (USB_ROLE_SWITCH=m && m) <- does not work
<krzk>
ah, wait you mean YYY should depend on XXX? this cannot do easily :( (YYY is the core driver, XXX is a regular driver like many of such)
<krzk>
javierm: maybe if I create some intermediary symbol... but that also won't get accepted :/
<javierm>
krzk: I see... let me try here to better understanding the issue
<javierm>
krzk: so you want CONFIG_EXTCON_PTN5150=y if CONFIG_USB_ROLE_SWITCH=y and CONFIG_EXTCON_PTN5150=m if CONFIG_USB_ROLE_SWITCH=m ?
<krzk>
javierm: not entirely CONFIG_EXTCON_PTN5150=y if CONFIG_USB_ROLE_SWITCH=y|n and CONFIG_EXTCON_PTN5150=m if CONFIG_USB_ROLE_SWITCH=y|m|n
<krzk>
javierm: the USB_ROLE_SWITCH is entirely optional (and it has necessary stubs), so it should be allowed to disable it.
<javierm>
krzk: ah, so EXTCON_PTN5150 doesn't fully depend on USB_ROLE_SWITCH ?
<krzk>
javierm: exactly, role switch is optional
<krzk>
so actually I want to disallow only one choice: (CONFIG_EXTCON_PTN5150=y if CONFIG_USB_ROLE_SWITCH=m) <- this won't work
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<arnd>
krzk: the idiomatic way for that is 'depends on USB_ROLE_SWITCH || !USB_ROLE_SWITCH'
<arnd>
krzk: it's what a number of other drivers already use
<arnd>
see drivers/usb/typec/Kconfig
<arnd>
krzk: an alternative is to have a helper symbol like we do for CONFIG_PTP_1588_CLOCK_OPTIONAL
<krzk>
arnd: ah, I checked that idiomatic way and was sure it did not work, but it actually works, just limits the XXX (PTN5150) choices, so this confused me.
<krzk>
arnd: The helper symbol is interesting choice but will spread all over, so maybe the depends is better. Thanks, that solves my problem.
<javierm>
interesting, I wasn't aware of that Kconfig idiom
<mvaittin>
krzk: I think I've hit this exactly same issue with the BD70528 WDG and RTC in the past. Back the it was Guenter who helped me out. It'd be great if there was some slightly more clear 'define' (like depends on NOT_MODULE(FOO)) for doing this - at least to me the depends on FOO || !FOO is counter intuitive... Unfortunately I have never studied the Kconfig so I have no idea if buiding such was possible.
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<arnd>
geertu: I sent a patch for removing ISA_DMA_API on m68k earlier today, after another look I think that GENERIC_ISA_DMA can go away as well -- if there are any ISA cards on Q40 or AMIGA_PCMCIA, I'm fairly sure they never worked with bus-master DMA
<arnd>
geertu: are there any non-DMA ISA cards that are commonly used on either machine, and that still have a driver in the kernel?
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<geertu>
Amiga big boxes (A[234]000) also have ISA slots, but to use these, you need to install a bridgeboard first.
<geertu>
Not supported by Linux, although you can probably find some very old preliminary patches.
<geertu>
(GoldenGate II, not to be confused with the VLSI VAS96011/12 on CHRP LongTrail)
<geertu>
arnd: Old bits are slowly being refreshed in my aging memory. Q40 relies on an ISA card for e.g. IDE
<geertu>
But nowadays it uses the atari-falcon-ide driver for that.
<arnd>
Ah right, that makes sense. IDE clearly works in PIO mode, unlike floppy.
<arnd>
ne2k would also work in PIO mode, and again seems to have Q40 bits
<geertu>
arnd: Nothing should use ISA DMA
<milkylainen>
4000/040. Those were the days.
<arnd>
geertu: ok, then I'll update the patch to drop GENERIC_ISA_DMA from m68k entirely
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<geertu>
arnd: Ah, the GG2 relics were removed in 808fa62f1b0f75ee ("m68k: Remove dead GG2 config option")
<arnd>
geertu: but AMIGA_PCMCIA still works, right?
<arnd>
with ISA cards behind a PCMCIA bridge
<geertu>
arnd: You mean real ISA cards on a PCMCIA-to-ISA bridge?
<arnd>
yes, that is what CONFIG_ISA refers to
<geertu>
(diving into history: originally GENERIC_ISA_DMA was def_bool y when introduced on m68k, and restricted to AMIGA PCMCIA, Q40, and GG2 later)
<geertu>
arnd: AFAIK the Amiga PCMCIA has only been used succesfully with 8390/apne.c
<geertu>
not with real ISA cards on an expansion board that plugs into the PCMCIA slot
<arnd>
ok, then I think we should drop ISA and GENERIC_ISA_DMA for AMIGA_PCMCIA as well
<arnd>
oh, it's possible that CONFIG_ISA interacts with the PCMCIA subsystem in other ways as well, it appears to implicitly enable CONFIG_PCMCIA_PROBE in order to pick a free IRQ
<arnd>
:qa
<arnd>
oops
<geertu>
arnd: Probably PCMCIA and ISA are entangled deeply :-(
<arnd>
not too much really. We assume that you can have PCMCIA support if ISA or PCI are available, and the drivers can share most of the internals, but aside from that, the PCMCIA subsystem lacks all the worst parts of the ISA code (which doesn't really have a subsystem)
<arnd>
ah, I had not noticed that AMIGA_PCMCIA is completely detached from CONFIG_PCMCIA, that sure simplifies things
<geertu>
arnd: yeah, we only support the real basic stuff
<arnd>
geertu: nothing wrong with that, I suppose arch/m68k/amiga/pcmcia.c could in fact get merged into drivers/net/ethernet/8390/apne.c if anyone cared, but it doesn't hurt to keep the option for a second device either
<arnd>
looks like that is only one standalone function it actually needs. Need to keep that in mind when brodo finally deletes the 16-bit PCMCIA support as he's been planning for a while. I think the function can simply be moved into apne or amiga_pcmcia if it comes to that
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<mwalle>
But I don't understand how it should work. Does it work with shared level interrupts? or does that fasteio thing only prevent the second edge interrupt from being fired
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<arnd>
second patch bomb of the day, converting pxa and omap1 to multiplatform
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<jn>
nice!
<geertu>
mwalle: A shared level interrupts stays asserted until the last source has been acked.
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<mwalle>
geertu: right. thats clear. But the hardware will can only generate interrupts on pin state changes. So I don't know how that was mapped to "the driver will accept level triggered interrupts"
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<broonie>
mwalle: Wishful thinking with someone having attached a level triggered device to an edge triggered interrupt controller?
<broonie>
You can bodge it well enough for some uses by polling the GPIO (there's examples upstream) but not usually in the interrupt controller.
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<mwalle>
broonie: to be fair its the GPIO controller which can do interrupts too (there is a dedicated ARM GICv2 where you can mux some external pins,.. but its high level only)
<mwalle>
broonie: but I'd like to understand what the intention of the EOI handler was. I mean it wasn't an oversight as it was explicitly explained in the commit message. unfortunately, the original authors mail bounces
<mwalle>
(i may just found his new mail though)
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