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

[Vladlen Grachev via B4 Relay <devnull+webholt.gmail.com@kernel.org>]

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>
---
 arch/arm64/boot/dts/qcom/msm8996-oneplus-common.dtsi | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/msm8996-oneplus-common.dtsi b/arch/arm64/boot/dts/qcom/msm8996-oneplus-common.dtsi
index 7a3f8afae..98fc45dc8 100644
--- a/arch/arm64/boot/dts/qcom/msm8996-oneplus-common.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8996-oneplus-common.dtsi
@@ -497,8 +497,6 @@ vreg_l32a_1p8: l32 {
 		};
 
 		vreg_lvs2a: lvs2 {
-			regulator-min-microvolt = <1800000>;
-			regulator-max-microvolt = <1800000>;
 		};
 	};
 };

---
base-commit: f5672a3dff0291d6a45eb0c258b9d2baeb4dc577
change-id: 20261029-op3t-lvs2-fix-44c8905ce34f

Best regards,
-- 
Vladlen Grachev <webholt@gmail.com>