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From:   Saravana Kannan <saravanak@google.com>
Date:   Fri, 5 Feb 2021 18:45:21 -0800
Message-ID: <CAGETcx_f7BEbkOFtw_6_4fMcgGOWkujbqXhDbDcNstOxgvcPfA@mail.gmail.com>
Subject: Re: [PATCH v4 0/8] Make fw_devlink=on more forgiving
To:     Jonathan Corbet <corbet@lwn.net>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Kevin Hilman <khilman@kernel.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Len Brown <len.brown@intel.com>, Len Brown <lenb@kernel.org>,
        Pavel Machek <pavel@ucw.cz>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Frank Rowand <frowand.list@gmail.com>,
        Marc Zyngier <maz@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>
Cc:     Linux Doc Mailing List <linux-doc@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux PM <linux-pm@vger.kernel.org>,
        linux-clk <linux-clk@vger.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Android Kernel Team <kernel-team@android.com>
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On Fri, Feb 5, 2021 at 2:26 PM Saravana Kannan <saravanak@google.com> wrote:
>
> There are a lot of devices/drivers where they never have a struct device
> created for them or the driver initializes the hardware without ever
> binding to the struct device.
>
> This series is intended to avoid any boot regressions due to such
> devices/drivers when fw_devlink=on and also address the handling of
> optional suppliers.
>
> Patch 1 and 2 addresses the issue of firmware nodes that look like
> they'll have struct devices created for them, but will never actually
> have struct devices added for them. For example, DT nodes with a
> compatible property that don't have devices added for them.
>
> Patch 3 and 4 allow for handling optional DT bindings.
>
> Patch 5 sets up a generic API to handle drivers that never bind with
> their devices.
>
> Patch 6 through 8 update different frameworks to use the new API.
>
> Thanks,
> Saravana
>

Forgot to add version history:

v1 -> v2:
Patch 1: Added a flag to fwnodes that aren't devices.
Patch 3: New patch to ise the flag set in patch 1 to not create bad links.

v2 -> v3:
- Patch 1: Added Rafael's Ack
- New patches 3 and 4

v3 -> v4:
- No changes to patches 1-4.
- New patches 5-8.

-Saravana

> Saravana Kannan (8):
>   driver core: fw_devlink: Detect supplier devices that will never be
>     added
>   of: property: Don't add links to absent suppliers
>   driver core: Add fw_devlink.strict kernel param
>   of: property: Add fw_devlink support for optional properties
>   driver core: fw_devlink: Handle suppliers that don't use driver core
>   irqdomain: Mark fwnodes when their irqdomain is added/removed
>   PM: domains: Mark fwnodes when their powerdomain is added/removed
>   clk: Mark fwnodes when their clock provider is added/removed
>
>  .../admin-guide/kernel-parameters.txt         |  5 ++
>  drivers/base/core.c                           | 58 ++++++++++++++++++-
>  drivers/base/power/domain.c                   |  2 +
>  drivers/clk/clk.c                             |  3 +
>  drivers/of/property.c                         | 16 +++--
>  include/linux/fwnode.h                        | 20 ++++++-
>  kernel/irq/irqdomain.c                        |  2 +
>  7 files changed, 98 insertions(+), 8 deletions(-)
>
> --
> 2.30.0.478.g8a0d178c01-goog
>