linux-kernel - Re: [PATCH v2] docs: ACPI: enumeration: add PCI hierarchy representation

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Message-ID: <20201120122805.GT2495@lahna.fi.intel.com>
Date:   Fri, 20 Nov 2020 14:28:05 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Flavio Suligoi <f.suligoi@...m.it>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-acpi@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] docs: ACPI: enumeration: add PCI hierarchy
 representation

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 <f.suligoi@...m.it>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>