linux-kernel - [PATCH v4 0/2] Fix simple-bus issues with fw

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Date:   Tue, 28 Sep 2021 17:07:32 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Russell King <linux@...linux.org.uk>,
        Neil Armstrong <narmstrong@...libre.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Damien Le Moal <damien.lemoal@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, kernel-team@...roid.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-oxnas@...ups.io, linux-renesas-soc@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: [PATCH v4 0/2] Fix simple-bus issues with fw_devlink

Ulf reported an issue[1] with fw_devlink. This series tries to fix that
issue.

I replicated a similar set up on my end and I confirmed:
- A simple-bus only device is probed.
- Another device listing simple-bus as a 2nd compatible string isn't
  probed.

v1->v2:
- Switched to probing the simple-bus device instead of marking it as
  NEVER_PROBES.

v2->v3:
- Moved all the code into the simple-pm-bus driver
- Addressed Ulf's comment about the remove() code missing a check.

v3->v4:
- Added support for driver_override to accommodate the case where new
  transparent bus compatible strings are added to DT, but the kernel hasn't
  been updated yet.
- Added/updated comments to give more details.
- Adding Ulf's Tested-by that he have for v3 (v4 didn't change by much).

Thanks,
Saravana
[1] - https://lore.kernel.org/lkml/CAPDyKFo9Bxremkb1dDrr4OcXSpE0keVze94Cm=zrkOVxHHxBmQ@mail.gmail.com/

Cc: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Rob Herring <robh+dt@...nel.org>

Saravana Kannan (2):
  drivers: bus: simple-pm-bus: Add support for probing simple bus only
    devices
  drivers: bus: Delete CONFIG_SIMPLE_PM_BUS

 arch/arm/configs/multi_v7_defconfig |  1 -
 arch/arm/configs/oxnas_v6_defconfig |  1 -
 arch/arm/configs/shmobile_defconfig |  1 -
 arch/arm/mach-omap2/Kconfig         |  1 -
 arch/arm64/configs/defconfig        |  1 -
 drivers/bus/Kconfig                 | 12 ---------
 drivers/bus/Makefile                |  2 +-
 drivers/bus/simple-pm-bus.c         | 42 ++++++++++++++++++++++++++---
 drivers/soc/canaan/Kconfig          |  1 -
 9 files changed, 40 insertions(+), 22 deletions(-)

-- 
2.33.0.685.g46640cef36-goog