From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Saravana Kannan <saravanak@google.com>
Cc: Russell King <linux@armlinux.org.uk>,
Neil Armstrong <narmstrong@baylibre.com>,
Magnus Damm <magnus.damm@gmail.com>,
Tony Lindgren <tony@atomide.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Damien Le Moal <damien.lemoal@wdc.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Android Kernel Team <kernel-team@android.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-oxnas@groups.io,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
"open list:TI ETHERNET SWITCH DRIVER (CPSW)"
<linux-omap@vger.kernel.org>,
linux-riscv <linux-riscv@lists.infradead.org>
Subject: Re: [PATCH v4 1/2] drivers: bus: simple-pm-bus: Add support for probing simple bus only devices
Date: Tue, 5 Oct 2021 17:07:01 +0200 [thread overview]
Message-ID: <CAMuHMdXG1MLQiwoaa6W5R8fJUBEUePUPnmqQ3baoVzLzp=JMLQ@mail.gmail.com> (raw)
In-Reply-To: <20210929000735.585237-2-saravanak@google.com>
On Wed, Sep 29, 2021 at 2:07 AM Saravana Kannan <saravanak@google.com> wrote:
> fw_devlink could end up creating device links for bus only devices.
> However, bus only devices don't get probed and can block probe() or
> sync_state() [1] call backs of other devices. To avoid this, probe these
> devices using the simple-pm-bus driver.
>
> However, there are instances of devices that are not simple buses (they get
> probed by their specific drivers) that also list the "simple-bus" (or other
> bus only compatible strings) in their compatible property to automatically
> populate their child devices. We still want these devices to get probed by
> their specific drivers. So, we make sure this driver only probes devices
> that are only buses.
>
> [1] - https://lore.kernel.org/lkml/CAPDyKFo9Bxremkb1dDrr4OcXSpE0keVze94Cm=zrkOVxHHxBmQ@mail.gmail.com/
> Fixes: c442a0d18744 ("driver core: Set fw_devlink to "permissive" behavior by default")
> Signed-off-by: Saravana Kannan <saravanak@google.com>
> Tested-by: Saravana Kannan <saravanak@google.com>
> Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Works fine on R-Car Gen/Gen3 (simple-bus), and SH-Mobile AG5
and R-Mobile APE6 (simple-pm-bus).
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2021-10-05 15:07 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-29 0:07 [PATCH v4 0/2] Fix simple-bus issues with fw_devlink Saravana Kannan
2021-09-29 0:07 ` [PATCH v4 1/2] drivers: bus: simple-pm-bus: Add support for probing simple bus only devices Saravana Kannan
2021-10-05 15:07 ` Geert Uytterhoeven [this message]
2021-11-10 12:16 ` Abel Vesa
2021-11-10 20:24 ` Saravana Kannan
2021-11-15 20:17 ` Saravana Kannan
2021-11-16 5:19 ` Tony Lindgren
2021-11-16 13:59 ` Abel Vesa
2021-11-16 15:11 ` Abel Vesa
2021-11-19 16:16 ` Abel Vesa
2021-11-24 1:07 ` Saravana Kannan
2022-02-01 3:18 ` Kevin Hilman
2022-02-01 5:30 ` Saravana Kannan
2022-02-01 18:36 ` Kevin Hilman
2022-02-02 19:58 ` Kevin Hilman
2021-09-29 0:07 ` [PATCH v4 2/2] drivers: bus: Delete CONFIG_SIMPLE_PM_BUS Saravana Kannan
2021-10-05 15:11 ` Geert Uytterhoeven
2021-10-21 11:21 ` Amit Pundir
2021-10-21 12:37 ` Tony Lindgren
2021-10-21 23:42 ` Saravana Kannan
2021-10-22 16:59 ` Amit Pundir
2021-10-26 0:30 ` Saravana Kannan
2021-10-26 17:49 ` Amit Pundir
2021-09-30 2:50 ` [PATCH v4 0/2] Fix simple-bus issues with fw_devlink Damien Le Moal
2021-10-06 5:29 ` Tony Lindgren
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