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Date:   Fri, 20 Nov 2020 14:28:05 +0200
From:   Mika Westerberg <>
To:     Flavio Suligoi <>
Cc:     "Rafael J . Wysocki" <>,
        Len Brown <>,
        Andy Shevchenko <>,,,
Subject: Re: [PATCH v2] docs: ACPI: enumeration: add PCI hierarchy

On Fri, Nov 20, 2020 at 12:11:25PM +0100, Flavio Suligoi wrote:
> For "fixed" PCI devices, such as chips directly soldered
> on the main board (ethernet, Wi-Fi, serial ports, etc.),
> it is possible to find an ACPI enumeration.
> This allows to add useful properties to these devices.
> Just for an example: the property "gpio-line-names" can be
> added to the pins of a GPIO expander on the PCI bus.
> In order to find the ACPI name of a PCI device, it's necessary
> to disassemble the BIOS ACPI tables (in particular the DSDT)
> and also to analyze the PCI bus topology of the board.
> This patch, with a practical example, show how to do this.
> Signed-off-by: Flavio Suligoi <>

Reviewed-by: Mika Westerberg <>

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