Re: [PATCH] arm64: dts: qcom: msm8996-oneplus-common: Drop LVS2 voltage constraints

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 10/29/26 7:12 PM, Vladlen Grachev via B4 Relay wrote:
> From: Vladlen Grachev <webholt@gmail.com>
> 
> Since commit 27880745470a ("arm64: dts: qcom: msm8996-oneplus: Add SLPI
> VDD_PX"), OnePlus 3T no longer boots: the PM8994 RPM regulator device
> fails to probe, so UFS, USB and the display never come up and the phone
> hangs on the bootloader splash screen:
> 
>   lvs2: failed to get the current voltage: -EINVAL
>   qcom_rpm_smd_regulator remoteproc:glink-edge:rpm-requests:regulators:
>     lvs2: devm_regulator_register() failed, ret=-22
>   qcom_rpm_smd_regulator remoteproc:glink-edge:rpm-requests:regulators:
>     probe with driver qcom_rpm_smd_regulator failed with error -22
> 
> The switch LVS2 cannot report its voltage, so the regulator core asks
> its input supply, vdd_lvs1_2, which is not described on these
> boards. Checking the 1.8 V constraint then fails with -EINVAL, and the
> RPM regulator driver aborts the probe of all PM8994 regulators.
> 
> Drop the constraints, like apq8096-db820c, which describes LVS1/LVS2
> without them. Keep the node, so that the SLPI still gets its px-supply.
> 
> Describing vdd_lvs1_2-supply as S4, as done on other MSM8996 boards,
> would also work, but it would only serve the constraint, which has
> nothing to enforce on a switch.
> 
> Tested on OnePlus 3T with the msm8996-mainline kernel based on v6.19.5.
> 
> Fixes: 27880745470a ("arm64: dts: qcom: msm8996-oneplus: Add SLPI VDD_PX")
> Cc: stable@vger.kernel.org
> Signed-off-by: Vladlen Grachev <webholt@gmail.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad