linux-kernel - Re: [PATCH v4 1/2] dt-bindings: phy: qcom-edp: Add reference clock for sa8775p eDP PHY

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Message-ID: <176970558251.1269081.4205775234649909264.robh@kernel.org>
Date: Thu, 29 Jan 2026 10:53:03 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Ritesh Kumar <quic_riteshk@...cinc.com>
Cc: quic_mahap@...cinc.com, robin.clark@....qualcomm.com,
	mripard@...nel.org, krzk+dt@...nel.org,
	dri-devel@...ts.freedesktop.org, martin.petersen@...cle.com,
	tzimmermann@...e.de, lumag@...nel.org, simona@...ll.ch,
	linux-kernel@...r.kernel.org, maarten.lankhorst@...ux.intel.com,
	sean@...rly.run, kishon@...nel.org,
	James.Bottomley@...senpartnership.com,
	marijn.suijten@...ainline.org, devicetree@...r.kernel.org,
	andersson@...nel.org, cros-qcom-dts-watchers@...omium.org,
	linux-scsi@...r.kernel.org, vkoul@...nel.org, mani@...nel.org,
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
	quic_vproddut@...cinc.com, abhinav.kumar@...ux.dev,
	conor+dt@...nel.org, konradybcio@...nel.org,
	freedreno@...ts.freedesktop.org, airlied@...il.com
Subject: Re: [PATCH v4 1/2] dt-bindings: phy: qcom-edp: Add reference clock
 for sa8775p eDP PHY


On Wed, 28 Jan 2026 17:18:49 +0530, Ritesh Kumar wrote:
> The initial sa8775p eDP PHY binding contribution missed adding support for
> voting on the eDP reference clock. This went unnoticed because the UFS PHY
> driver happened to enable the same clock.
> 
> After commit 77d2fa54a945 ("scsi: ufs: qcom : Refactor phy_power_on/off
> calls"), the eDP reference clock is no longer kept enabled, which results
> in the following PHY power-on failure:
> 
> phy phy-aec2a00.phy.10: phy poweron failed --> -110
> 
> To fix this, explicit voting for the eDP reference clock is required.
> This patch adds the eDP reference clock for sa8775p eDP PHY and updates
> the corresponding example node.
> 
> Signed-off-by: Ritesh Kumar <quic_riteshk@...cinc.com>
> ---
>  .../devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml  | 6 ++++--
>  Documentation/devicetree/bindings/phy/qcom,edp-phy.yaml     | 1 +
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 

Acked-by: Rob Herring (Arm) <robh@...nel.org>