Linux-Doc Archive on lore.kernel.org
 help / color / Atom feed
From: Saravana Kannan <saravanak@google.com>
To: Tudor Ambarus <Tudor.Ambarus@microchip.com>
Cc: 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>,
	"Brown, Len" <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>,
	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>
Subject: Re: [PATCH v4 0/8] Make fw_devlink=on more forgiving
Date: Wed, 10 Feb 2021 11:14:55 -0800
Message-ID: <CAGETcx87RmBAhC2Kg0xP9oYGhGWXFWoTtshzuqT2=4_svm5s5A@mail.gmail.com> (raw)
In-Reply-To: <3ec7ba3a-bbf6-aa5f-7800-4fc91ab199ec@microchip.com>

On Wed, Feb 10, 2021 at 2:02 AM <Tudor.Ambarus@microchip.com> wrote:
>
> On 2/10/21 10:54 AM, Saravana Kannan wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >
> > On Wed, Feb 10, 2021 at 12:19 AM <Tudor.Ambarus@microchip.com> wrote:
> >>
> >> Hi, Saravana,
> >>
> >> On 2/6/21 12:26 AM, Saravana Kannan 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
> >>>
> >>> 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(-)
> >>>
> >>
> >> Even with this patch set applied, sama5d2_xplained can not boot.
> >> Patch at [1] makes sama5d2_xplained boot again. Stephen applied it
> >> to clk-next.
> >
> > I'm glad you won't actually have any boot issues in 5.12, but the fact
> > you need [1] with this series doesn't make a lot of sense to me
> > because:
> >
> > 1. The FWNODE_FLAG_INITIALIZED flag will be set for the clock fwnode
> > in question way before any consumer devices are added.
>
> Looks like in my case FWNODE_FLAG_INITIALIZED is not set, because
> drivers/clk/at91/sama5d2.c uses of_clk_add_hw_provider().

Ah, that explains it.

> > 2. Any consumer device added after (1) will stop trying to link to the
> > clock device.
> >
> > Are you somehow adding a consumer to the clock fwnode before (1)?
> >
> > Can you try this patch without your clk fix? I was trying to avoid
> > looping through a list, but looks like your case might somehow need
> > it?
> >
>
> I tried it, didn't solve my boot problem.

Thanks! I should stop coding past midnight!

> The following patch makes the
> sama5d2_xplained boot again, even without the patch from [1]:

Great! I gave a reviewed-by.

-Saravana

  reply index

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210205222651eucas1p28ef87073dea33c1c5224c14aa203bec5@eucas1p2.samsung.com>
2021-02-05 22:26 ` Saravana Kannan
2021-02-05 22:26   ` [PATCH v4 1/8] driver core: fw_devlink: Detect supplier devices that will never be added Saravana Kannan
2021-02-05 22:26   ` [PATCH v4 2/8] of: property: Don't add links to absent suppliers Saravana Kannan
2021-02-09 21:25     ` Rob Herring
2021-02-05 22:26   ` [PATCH v4 3/8] driver core: Add fw_devlink.strict kernel param Saravana Kannan
2021-02-05 22:26   ` [PATCH v4 4/8] of: property: Add fw_devlink support for optional properties Saravana Kannan
2021-02-09 21:33     ` Rob Herring
2021-02-09 21:54       ` Saravana Kannan
2021-02-10  8:25         ` Geert Uytterhoeven
2021-02-05 22:26   ` [PATCH v4 5/8] driver core: fw_devlink: Handle suppliers that don't use driver core Saravana Kannan
2021-02-05 22:26   ` [PATCH v4 6/8] irqdomain: Mark fwnodes when their irqdomain is added/removed Saravana Kannan
2021-02-05 22:26   ` [PATCH v4 7/8] PM: domains: Mark fwnodes when their powerdomain " Saravana Kannan
2021-02-05 22:26   ` [PATCH v4 8/8] clk: Mark fwnodes when their clock provider " Saravana Kannan
2021-02-08 15:38     ` Rob Herring
2021-02-08 23:34       ` Saravana Kannan
2021-02-10 11:44     ` [PATCH] clk: Mark fwnodes when their clock provider is added Tudor Ambarus
2021-02-10 11:44       ` Tudor Ambarus
2021-02-11 13:00         ` Greg KH
2021-02-13  0:37           ` Stephen Boyd
     [not found]         ` <CGME20210325133159eucas1p297b769beb681743fb32d362a86cc6e3e@eucas1p2.samsung.com>
2021-03-25 13:31           ` Marek Szyprowski
2021-03-25 15:47             ` Geert Uytterhoeven
2021-03-25 18:25             ` Nicolas Saenz Julienne
2021-03-26 18:13               ` Stephen Boyd
2021-03-26 18:29                 ` Geert Uytterhoeven
     [not found]                   ` <161705310317.3012082.15148238105608149214@swboyd.mtv.corp.google.com>
2021-03-29 23:28                     ` Saravana Kannan
     [not found]                       ` <161706920822.3012082.10047587064612237296@swboyd.mtv.corp.google.com>
2021-03-30  6:58                         ` Geert Uytterhoeven
     [not found]                           ` <161715734080.2260335.881350237641202575@swboyd.mtv.corp.google.com>
2021-03-31  7:05                             ` Geert Uytterhoeven
     [not found]                               ` <161721871083.2260335.2392646934517115770@swboyd.mtv.corp.google.com>
2021-04-05 11:04                                 ` Nicolas Saenz Julienne
2021-04-21  3:26         ` Guenter Roeck
2021-04-21  7:00           ` Saravana Kannan
2021-02-10 19:13       ` Saravana Kannan
2021-03-30 15:42       ` Guenter Roeck
2021-03-30 16:26         ` Saravana Kannan
     [not found]     ` <161317679292.1254594.15797939257637374295@swboyd.mtv.corp.google.com>
2021-02-14 21:15       ` [PATCH v4 8/8] clk: Mark fwnodes when their clock provider is added/removed Saravana Kannan
2021-02-06  2:45   ` [PATCH v4 0/8] Make fw_devlink=on more forgiving Saravana Kannan
2021-02-06 19:41   ` Geert Uytterhoeven
2021-02-06 20:47     ` Saravana Kannan
2021-02-08  8:40   ` Marek Szyprowski
2021-02-08 23:57     ` Saravana Kannan
2021-02-10  8:19   ` Tudor.Ambarus
2021-02-10  8:54     ` Saravana Kannan
2021-02-10 10:02       ` Tudor.Ambarus
2021-02-10 19:14         ` Saravana Kannan [this message]
2021-02-11 13:00   ` Geert Uytterhoeven
2021-02-11 13:05     ` Geert Uytterhoeven
2021-02-12  2:59     ` Saravana Kannan
2021-02-12  8:14       ` Geert Uytterhoeven
2021-02-12 20:57         ` Saravana Kannan
2021-02-15 12:38       ` Geert Uytterhoeven
2021-02-15 21:26         ` Saravana Kannan
2021-02-16  8:05           ` Geert Uytterhoeven
2021-02-16 18:48             ` Saravana Kannan
2021-02-16 20:31               ` Geert Uytterhoeven
2021-02-17 23:57                 ` Saravana Kannan
2021-02-25  9:21                   ` Geert Uytterhoeven
2021-02-15 15:16       ` Geert Uytterhoeven
2021-02-15 21:57         ` Saravana Kannan
2021-02-16 12:58           ` Geert Uytterhoeven
2021-02-15 11:19     ` Geert Uytterhoeven

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CAGETcx87RmBAhC2Kg0xP9oYGhGWXFWoTtshzuqT2=4_svm5s5A@mail.gmail.com' \
    --to=saravanak@google.com \
    --cc=Tudor.Ambarus@microchip.com \
    --cc=corbet@lwn.net \
    --cc=devicetree@vger.kernel.org \
    --cc=frowand.list@gmail.com \
    --cc=geert@linux-m68k.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=kernel-team@android.com \
    --cc=khilman@kernel.org \
    --cc=len.brown@intel.com \
    --cc=lenb@kernel.org \
    --cc=linux-acpi@vger.kernel.org \
    --cc=linux-clk@vger.kernel.org \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=m.szyprowski@samsung.com \
    --cc=maz@kernel.org \
    --cc=mturquette@baylibre.com \
    --cc=pavel@ucw.cz \
    --cc=rafael@kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=sboyd@kernel.org \
    --cc=tglx@linutronix.de \
    --cc=ulf.hansson@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Doc Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-doc/0 linux-doc/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-doc linux-doc/ https://lore.kernel.org/linux-doc \
		linux-doc@vger.kernel.org
	public-inbox-index linux-doc

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-doc


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git