On Mon, 2 Mar 2009, Alessandro Zummo wrote:
On Mon, 2 Mar 2009 11:28:01 +0100 (CET)
Geert Uytterhoeven <Geert.Uytterhoeven@xxxxxxxxxxx> wrote:
So I can solve my problem (autoloading the RTC driver on PS3 by udev) by
converting the old genrtc driver into a platform device driver and creating
platform devices where appropriate.
yes. btw, if you are building a kernel specific for the PS3, I would
compile the rtc driver statically, otherwise it won't be available
early on boot.
However, this doesn't solve the distro's problem: as the old RTC framework
depends on RTC_LIB=n, you cannot have both old and new RTC drivers in your
(single) distro kernel. That's why dmwm2 created drivers/rtc/rtc-ppc.c: Fedora
had to support machines with both old and new RTC drivers. As all of the old
drivers are actually behind the ppc_md.[sg]et_rtc_time() abstraction, this was
very easy.
ok, generic kernel. you will have to load the modules on initrd. no, sadly you
can't have both of them. you might stick with the old interface or
convert them all.
Hence it's all or nothing, and we have to convert all of them.
drivers/rtc/rtc-generic.c would allow to have a working system without old
RTC drivers, until all low-level code has been converted to individual RTC
drivers.
I know but I have enough experience to foresee that once a generic over generic
framework is in place it's very hard to get rid of it because people
will have no incentives.
I know.
If you really need rtc-generic you can keep using it even if it's
not in the kernel, distributions often have their specific
set of kernel patches.
rtc-generic is already in the kernel, it's just called rtc-parisc ;-)
But I'd strongly suggest to plan and execute a conversion process.
So would you accept a patch series that:
1. Adds the missing module aliases to rtc-parisc (which is a bugfix),
2. Moves the platform device creation out of rtc-ppc and into arch-specific
code (which is also a bugfix),
3. Consolidates rtc-parisc and rtc-ppc into rtc-generic (which is a cleanup),
4. Makes rtc-generic dependent on PARISC, PPC, and M68K (the existing
[sg]et_rtc_time() users):
a. without introducing ARCH_HAS_GENERIC_RTC,
b. with a big fat warning in the Kconfig comment not relaxing the
dependencies, as it's supposed to go away.
4. Converts the PS3 RTC support into a separate driver, called rtc-ps3
(as a bonus ;-)
? If yes, I'll cook it up.
Other RTC platform support can be converted into separate drivers later.
Thanks!
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: Geert.Uytterhoeven@xxxxxxxxxxx
Internet: http://www.sony-europe.com/
A division of Sony Europe (Belgium) N.V.
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