Hi Max,
On Mon, Jul 29, 2019 at 5:38 PM Max <max@xxxxxxxxx> wrote:
On 07/29/2019 05:26 PM, Geert Uytterhoeven wrote:
We *could* also temporarily split off a pata_buddha_xsurf driver: pata_buddha would be auto-probed by the new framework, and pata_buddha_xsurf would do the old module_init() dance.
That is, until the MFD conversion happens.
Or add temporarily a late_initcall() to find all X-Surf boards using
zorro_find_device(), create fake zorro_device_id entries, and pass both
to pata_buddha_probe()? A big ugly, but that should work.
Sounds good, and it replaces modile_init() at the same time. I'll implement this.
Thanks!
Your single Buddha should be sufficient to convert pata_buddha.c from
a plain Zorro driver to an MFD cell driver, and test it.
I expect the buddha-mfd.c MFD driver from my zorro-mfd branch to
work as-is, or with very minor changes.
However, to keep X-Surf working, this needs to be synchronized with
a Zorro MFD conversion of the zorro8390 driver, too.
Yeah, this second part is where I get caught up. I'd really like to test this with a real X-Surf, or have someone test it, before sending it upstream.
Of course it should be tested ;-)
Converting zorro8390.c from a zorro driver to an MFD cell driver should
not require that many changes, most bugs should be caught by code review.
I already have a skeleton 8390-cell.c driver in my zorro-mfd branch.
Honestly, at this point I'd rather do the hack above and keep the MFD stuff for later. Let's take it step by step. I'd prefer not to touch 8390 for now, unless I can get my hands on an X-Surf. I'd like to help with the MFD stuff as a way to enable the clockport and my SilverSurfer on it, but for the moment I'd rather move that further down the road.
OK, fine for me, of course.
Yes, the clockport could be added as an extra MFD cell. Later, drivers can
be written to bind against the clockport cell.
Yes, but how can we assign specific drivers to specific clockports? As they are non-enumerable (are they?), we can't auto-probe them.
That's something the user has to configure.
The Buddha MFD driver registers an "a1200-clockport" cell, which is
really a separate platform device.
The user writes the name of the actual driver to use to the device's
driver_override file in sysfs, after which the driver is bound
automatically. See Documentation/ABI/testing/sysfs-bus-platform,
That sounds just like what I was hoping for, thanks.
I'm happy you like it ;-)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
