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Message-ID: <aF7H4-toeb7Ouz3d@smile.fi.intel.com>
Date: Fri, 27 Jun 2025 19:33:39 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Rob Herring <robh@...nel.org>
Cc: Herve Codina <herve.codina@...tlin.com>, Andrew Lunn <andrew@...n.ch>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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Subject: Re: [PATCH v3 18/28] of: property: Allow fw_devlink device-tree on
x86 when PCI device-tree node creation is enabled
On Fri, Jun 27, 2025 at 11:22:45AM -0500, Rob Herring wrote:
> On Fri, Jun 13, 2025 at 03:47:58PM +0200, Herve Codina wrote:
...
> > - if (IS_ENABLED(CONFIG_X86))
> > + if (IS_ENABLED(CONFIG_X86) && !IS_ENABLED(CONFIG_PCI_DYNAMIC_OF_NODES))
>
> I really want CONFIG_PCI_DYNAMIC_OF_NODES to go away at some point, not
> add more users.
>
> I think this should instead check for specific platforms not with
> kconfig symbols but DT properties. For ce4100, you can just check the
> root compatible string. For OLPC, there isn't a root compatible (in the
> DT I have). You could check for /architecture == OLPC instead. There's
> some virtualization guests using DT now too. I would think their DT's
> are simple enough to avoid any fw_devlink issues.
I don't think this is good approach. The above check is more reliable in my
opinion.
> Alternatively, we could perhaps make x86 fw_devlink default off
For my (little) knowledge I believe this is not feasible anymore.
Some x86 code (drivers) relies on fw_devlink nowadays. But take
this with grain of salt, I may be way mistaken.
> and then enable it only when you create nodes. Maybe it has to be restricted
> a sub tree of the DT to avoid any later interactions if devices are unbound
> and rebound. Not a fully fleshed out idea...
--
With Best Regards,
Andy Shevchenko
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