linux-kernel - Re: [PATCH v4 02/16] dt-bindings: display/msm: hdmi: drop hpd-gpios

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Message-ID: <20250211-fuzzy-piculet-from-eldorado-6dce4e@krzk-bin>
Date: Tue, 11 Feb 2025 09:26:31 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Rob Clark <robdclark@...il.com>, 
	Abhinav Kumar <quic_abhinavk@...cinc.com>, Sean Paul <sean@...rly.run>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konradybcio@...nel.org>, Simona Vetter <simona.vetter@...ll.ch>, 
	linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 02/16] dt-bindings: display/msm: hdmi: drop hpd-gpios

On Sun, Feb 09, 2025 at 07:04:46AM +0200, Dmitry Baryshkov wrote:
> Supporting simultaneous check of native HPD and the external GPIO proved
> to be less stable than just native HPD. Drop the hpd-gpios from the
> bindings. This is not a breaking change, since the HDMI block has been
> using both GPIO _and_ internal HPD anyway. In case the native HPD
> doesn't work users are urged to switch to specifying the hpd-gpios
> property to the hdmi-connector device.

In that case users would need to update their DTS/DTB, so that's an ABI
break.

Please deprecate the property here (deprecated: true) and keep support
in the driver.

Best regards,
Krzysztof