[PATCH] arm64: dts: qcom: glymur-crd: Mark L4C regulator as boot-on to save power

[Kamal Wadhwa]

On current Glymur Rev-1 boards, the third USB controller and PHY are
not enabled, so the L4C regulator has no active consumers. The
regulator node cannot be removed, however, since Rev-2 boards will
enable the corresponding USB hardware.

This rail may have been left enabled by the bootloader. The RPMH
regulator driver cannot query real hardware state, so without
regulator-boot-on the core assumes the rail is already off and never
issues an explicit disable during late cleanup, leaving it enabled
indefinitely while unused.

Add regulator-boot-on so the core knows to explicitly disable the
rail during late cleanup when no consumers are present.

Signed-off-by: Kamal Wadhwa <kamal.wadhwa@xxxxxxxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/glymur-crd.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/qcom/glymur-crd.dtsi b/arch/arm64/boot/dts/qcom/glymur-crd.dtsi
index 58158b51fe29..ab4c9c33f4e6 100644
--- a/arch/arm64/boot/dts/qcom/glymur-crd.dtsi
+++ b/arch/arm64/boot/dts/qcom/glymur-crd.dtsi
@@ -472,6 +472,7 @@ vreg_l4c_e1_0p72: ldo4 {
 			regulator-min-microvolt = <720000>;
 			regulator-max-microvolt = <720000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+			regulator-boot-on;
 		};
 	};
 

---
base-commit: b018686719706a781c45a874ed51374a2dc4b767
change-id: 20261008-b4-regulator-boot-on-l4c-8d119b1de4ef

Best regards,
--  
Kamal Wadhwa <kamal.wadhwa@xxxxxxxxxxxxxxxx>