linux-kernel - [PATCH v1 0/6] ACPI: scan: MIPI DiSco for Imaging support

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Message-ID: <13276375.uLZWGnKmhe@kreacher>
Date:   Wed, 24 May 2023 13:38:32 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 0/6] ACPI: scan: MIPI DiSco for Imaging support

Hi Folks,

This basically is a re-write of a recent patch series from Sakari:

https://lore.kernel.org/linux-acpi/20230329100951.1522322-1-sakari.ailus@linux.intel.com

The general idea is the same - CSI-2 resource descriptors, introduced in
ACPI 6.4 and defined by

https://uefi.org/specs/ACPI/6.5/06_Device_Configuration.html#camera-serial-interface-csi-2-connection-resource-descriptor

are found and used for creating a set of software nodes that represent the CSI-2
connection graph.

These software nodes need to be available before any scan handlers or ACPI drivers
are bound to any struct acpi_device objects, so all of that is done at the early
stage of ACPI device enumeration, but unnecessary ACPI namespace walks are avoided.

The CSI-2 software nodes are populated with data extracted from the CSI-2 resource
descriptors themselves and from device properties defined by the MIPI DiSco for
Imaging specification (see https://www.mipi.org/specifications/mipi-disco-imaging).

Patches [4,6/6] come from the original series directly, but the other patches have
been changes substantially, so I've decided to re-start patch series versioning from
scratch.

This series is based on the patch at

https://patchwork.kernel.org/project/linux-acpi/patch/12223415.O9o76ZdvQC@kreacher/

applied on top of 6.4-rc3.

Later on, I'll put all of this material into a special git branch for easier
access.

Thanks!