linux-kernel - Re: [PATCH 1/2] drivers: base: component: add function to query the bound status

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Message-ID: <2025022153-outdoors-snugly-3967@gregkh>
Date: Fri, 21 Feb 2025 07:14:07 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Heiko Stuebner <heiko@...ech.de>
Cc: rafael@...nel.org, dakr@...nel.org, hjc@...k-chips.com,
	andy.yan@...k-chips.com, maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org, tzimmermann@...e.de,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, quentin.schulz@...rry.de
Subject: Re: [PATCH 1/2] drivers: base: component: add function to query the
 bound status

On Fri, Feb 21, 2025 at 12:41:40AM +0100, Heiko Stuebner wrote:
> The component helpers already expose the bound status in debugfs, but at
> times it might be necessary to also check that state in the kernel and
> act differently depending on the result.
> 
> For example the shutdown handler of a drm-driver might need to stop
> a whole output pipeline if the drm device is up and running, but may
> run into problems if that drm-device has never been set up before,
> for example because the binding deferred.
> 
> So add a little helper that returns the bound status for a componet
> device.
> 
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> ---
>  drivers/base/component.c  | 14 ++++++++++++++
>  include/linux/component.h |  4 +++-
>  2 files changed, 17 insertions(+), 1 deletion(-)

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>