[PATCH 3/4] arm64: dts: qcom: x1-dell-thena: mark l12b and l15b always-on

[Michael Scott]

The l12b and l15b supplies are used by components that are not (fully)
described (and some never will be) and must never be disabled.

Mark the regulators as always-on to prevent them from being disabled,
for example, when consumers probe defer or suspend.

Note that these supplies currently have no consumers described in
mainline for dell-thena beyond the audio codec (vdd-buck/vdd-rxtx/
vdd-io on wcd938x), which can release them when the codec goes idle.
The board-level gpio-fixed regulators that feed the Type-C retimer's
VDDIO and other rails are not described with a vin-supply link, so
the kernel cannot keep their parent LDOs alive on its own.

This mirrors the same change Johan Hovold applied to every other
X1E80100 board in a March 2025 series; commit 63169c07d740
("arm64: dts: qcom: x1e80100-dell-xps13-9345: mark l12b and l15b always-on")
is representative. The dell-thena board file was introduced four months
later and did not inherit that change; this patch closes the gap.

Fixes: e7733b42111c ("arm64: dts: qcom: Add support for Dell Inspiron 7441 / Latitude 7455")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michael Scott <mike.scott@xxxxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/x1-dell-thena.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/x1-dell-thena.dtsi b/arch/arm64/boot/dts/qcom/x1-dell-thena.dtsi
index 96e7a18366dc..d93b704872b5 100644
--- a/arch/arm64/boot/dts/qcom/x1-dell-thena.dtsi
+++ b/arch/arm64/boot/dts/qcom/x1-dell-thena.dtsi
@@ -589,6 +589,7 @@ vreg_l12b_1p2: ldo12 {
 			regulator-min-microvolt = <1200000>;
 			regulator-max-microvolt = <1200000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+			regulator-always-on;
 		};
 
 		vreg_l13b_3p0: ldo13 {
@@ -610,6 +611,7 @@ vreg_l15b_1p8: ldo15 {
 			regulator-min-microvolt = <1800000>;
 			regulator-max-microvolt = <1800000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+			regulator-always-on;
 		};
 	};
 
-- 
2.53.0