linux-kernel - Re: [PATCH v7 2/9] drm/bridge: Implement generic USB Type-C DP HPD bridge

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Message-ID: <aPs34Co-8UoQWuim@kuha.fi.intel.com>
Date: Fri, 24 Oct 2025 11:25:04 +0300
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Chaoyi Chen <chaoyi.chen@...k-chips.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>, Sandy Huang <hjc@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	Yubing Zhang <yubing.zhang@...k-chips.com>,
	Frank Wang <frank.wang@...k-chips.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Amit Sunil Dhamne <amitsd@...gle.com>,
	Dragan Simic <dsimic@...jaro.org>, Johan Jonker <jbx6244@...il.com>,
	Diederik de Haas <didi.debian@...ow.org>,
	Peter Robinson <pbrobinson@...il.com>, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-phy@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v7 2/9] drm/bridge: Implement generic USB Type-C DP HPD
 bridge

On Fri, Oct 24, 2025 at 04:12:47PM +0800, Chaoyi Chen wrote:
> On 10/24/2025 3:36 PM, Heikki Krogerus wrote:
> 
> > > Another thing is that CONFIG_DRM_AUX_HPD_BRIDGE originally needed to be
> > > selected by other modules. With this change, we also need to expose it in
> > > Kconfig.
> > Sorry, I don't understand the problem here? What do you need to expose
> > in Kconfig?
> 
> config DRM_AUX_HPD_BRIDGE
>     tristate
>     depends on DRM_BRIDGE && OF
>     select AUXILIARY_BUS
>     help
>       Simple bridge that terminates the bridge chain and provides HPD
>       support.
> 
> The tristate here is empty, so now it can only be selected by some TypeC
> controller drivers. I think it's not a big deal, just expose this item.

Ah, got it.

thanks,

-- 
heikki