Re: [PATCH 1/2] udev: update init script for conditional probing of platform bus

[Denys Dmytriyenko <denis@denix.org>]

On Thu, Jun 19, 2014 at 06:53:22PM -0400, Denys Dmytriyenko wrote:
> From: Denys Dmytriyenko <denys@ti.com>
> 
> Make probing of "platform" bus conditional based on PROBE_PLATFORM_BUS
> variable from /etc/default/udev-cache on subsequent boots when udev
> cache is used. PROBE_PLATFORM_BUS has to be set to "yes" in order to
> force probing on every boot, otherwise it uses the old default behaviour
> of probing it just the first time.
> 
> This is helpful on modern SoCs where most of the low level peripheral
> drivers are registered on the platform bus and need to be probed to load
> the necessary modules and enable the connected buses and subsystems.

Any questions, comments? I would like to keep a dialog open on this one. 
Thanks.


> Signed-off-by: Denys Dmytriyenko <denys@ti.com>
> ---
>  meta/recipes-core/udev/udev/init | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/meta/recipes-core/udev/udev/init b/meta/recipes-core/udev/udev/init
> index 410a650..f2c84d5 100644
> --- a/meta/recipes-core/udev/udev/init
> +++ b/meta/recipes-core/udev/udev/init
> @@ -102,7 +102,12 @@ case "$1" in
>  
>      udevadm control --env=STARTUP=1
>      if [ "$not_first_boot" != "" ];then
> -            udevadm trigger --action=add --subsystem-nomatch=tty --subsystem-nomatch=mem --subsystem-nomatch=vc --subsystem-nomatch=vtconsole --subsystem-nomatch=misc --subsystem-nomatch=dcon --subsystem-nomatch=pci_bus  --subsystem-nomatch=graphics	 --subsystem-nomatch=backlight --subsystem-nomatch=video4linux	--subsystem-nomatch=platform
> +            if [ "$PROBE_PLATFORM_BUS" != "yes" ]; then
> +                PLATFORM_BUS_NOMATCH="--subsystem-nomatch=platform"
> +            else
> +                PLATFORM_BUS_NOMATCH=""
> +            fi
> +            udevadm trigger --action=add --subsystem-nomatch=tty --subsystem-nomatch=mem --subsystem-nomatch=vc --subsystem-nomatch=vtconsole --subsystem-nomatch=misc --subsystem-nomatch=dcon --subsystem-nomatch=pci_bus --subsystem-nomatch=graphics --subsystem-nomatch=backlight --subsystem-nomatch=video4linux $PLATFORM_BUS_NOMATCH
>              (udevadm settle --timeout=3; udevadm control --env=STARTUP=)&
>      else
>              udevadm trigger --action=add
> -- 
> 2.0.0
> 
> -- 
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