arm/dt: msm8974: Use voltage floor corner for PM8841 SMPS 2 and SMPS 4

Add voltage floor corner regulator interfaces in the MSM8974
device tree for the PM8841 SMPS 2 and SMPS 4 regulators (VDD_CX
and VDD_GFX respectively).  These interfaces will be used to
impose a minimum active voltage corner in low temperature
situations.

Change-Id: I3a57bb85181403c4c5d869632fcca5c1b5ac6e92
Signed-off-by: David Collins <collinsd@codeaurora.org>
diff --git a/arch/arm/boot/dts/msm8974-regulator.dtsi b/arch/arm/boot/dts/msm8974-regulator.dtsi
index 5eff79c..b125138 100644
--- a/arch/arm/boot/dts/msm8974-regulator.dtsi
+++ b/arch/arm/boot/dts/msm8974-regulator.dtsi
@@ -93,6 +93,15 @@
 			qcom,use-voltage-corner;
 			compatible = "qcom,rpm-regulator-smd";
 		};
+		pm8841_s2_floor_corner: regulator-s2-floor-corner {
+			compatible = "qcom,rpm-regulator-smd";
+			regulator-name = "8841_s2_floor_corner";
+			qcom,set = <3>;
+			regulator-min-microvolt = <1>;
+			regulator-max-microvolt = <7>;
+			qcom,use-voltage-floor-corner;
+			qcom,always-send-voltage;
+		};
 	};
 
 	rpm-regulator-smpb3 {
@@ -121,6 +130,15 @@
 			regulator-max-microvolt = <7>;
 			qcom,init-voltage-corner = <3>; /* SVS SOC */
 		};
+		pm8841_s4_floor_corner: regulator-s4-floor-corner {
+			compatible = "qcom,rpm-regulator-smd";
+			regulator-name = "8841_s4_floor_corner";
+			qcom,set = <3>;
+			regulator-min-microvolt = <1>;
+			regulator-max-microvolt = <7>;
+			qcom,use-voltage-floor-corner;
+			qcom,always-send-voltage;
+		};
 	};
 
 	rpm-regulator-smpa1 {