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Date:   Tue, 5 Oct 2021 17:07:01 +0200
From:   Geert Uytterhoeven <>
To:     Saravana Kannan <>
Cc:     Russell King <>,
        Neil Armstrong <>,
        Magnus Damm <>,
        Tony Lindgren <>,
        Catalin Marinas <>,
        Will Deacon <>,
        Damien Le Moal <>,
        Greg Kroah-Hartman <>,
        Ulf Hansson <>,
        Rob Herring <>,
        Android Kernel Team <>,
        Linux ARM <>,
        Linux Kernel Mailing List <>,,
        Linux-Renesas <>,
        "open list:TI ETHERNET SWITCH DRIVER (CPSW)" 
        linux-riscv <>
Subject: Re: [PATCH v4 1/2] drivers: bus: simple-pm-bus: Add support for
 probing simple bus only devices

On Wed, Sep 29, 2021 at 2:07 AM Saravana Kannan <> 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] -
> Fixes: c442a0d18744 ("driver core: Set fw_devlink to "permissive" behavior by default")
> Signed-off-by: Saravana Kannan <>
> Tested-by: Saravana Kannan <>
> Tested-by: Ulf Hansson <>

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 Uytterhoeven -- There's lots of Linux beyond ia32 --

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

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