Re: How to add the "gpio-line-names" property in a PCI gpio expander

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Mon, Nov 09, 2020 at 12:34:32PM +0200, Andy Shevchenko wrote:
> On Mon, Nov 09, 2020 at 09:05:36AM +0000, Flavio Suligoi wrote:
> 
> > > Glad to hear this! So, maybe you can add some bits to the documentation
> > > [1]
> > > based on your experience?
> > 
> > Yes, I can! Thanks you for asking me!
> > 
> > > Note, I have sent a series [2] to amend it a bit, and your input welcome!
> > > 
> > > [1]: Documentation/firmware-guide/acpi/gpio-properties.rst
> > > [2]: https://lore.kernel.org/linux-acpi/20201029193243.61546-1-
> > > andriy.shevchenko@linux.intel.com/T/#u
> > 
> > Ok, I'll see how to integrate my PCI "investigation" about the
> > identification of the correct path from the CPU to the final PCI
> > device, through the various bridges of the board.
> > I think that a general discourse about it can be useful to
> > other people, too.
> 
> I realized that here we have two items to document:
> 1) the gpio-line-names property in [1];

More precise here is to extend the existing documentation with the examples and
explanation how GPIO subsystem in Linux is expecting those names to be (as I
explained in one thread to you that the property covers only line names from
the beginning to the first hole, when no name is provided, i.o.w. holes are not
accepted).

> 2) PCI hierarchy in ACPI tables, which can be added into [3] under
>    the "PCI hierarchy representation" title or so.
> 
> [3]: Documentation/firmware-guide/acpi/enumeration.rst

-- 
With Best Regards,
Andy Shevchenko