Some sleuthing work by Aleksandrs Vinarskis in the bowels of the ACPI
tables for this part shows we need l7b_2p8 for the avdd supply.

Suggested-by: Aleksandrs Vinarskis <alex.vinarskis@gmail.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
---
 arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
index f10dff1da7f8e..b09b6c87132e9 100644
--- a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
+++ b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
@@ -552,6 +552,13 @@ vreg_l2b_3p0: ldo2 {
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 		};
 
+		vreg_l7b_2p8: ldo7 {
+			regulator-name = "vreg_l7b_2p8";
+			regulator-min-microvolt = <2800000>;
+			regulator-max-microvolt = <2800000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+
 		vreg_l8b_3p0: ldo8 {
 			regulator-name = "vreg_l8b_3p0";
 			regulator-min-microvolt = <3072000>;

-- 
2.52.0