[PATCH 2/2] ARM: imx: ventana: enable LDO bypass mode for GW54xx

[Tim Harvey]

The GW54xx baseboard has a PFUZE100 PMIC capable of regulating the
core voltages (VDD_ARM, VDD_SOC) externally such that the internal IMX6
anatop LDO regulators are not needed. This provides a power reduction
(as the PMIC is more efficient than the LDO's) as well as moves some
of the power/thermal burden from the IMX to the PMIC.

Signed-off-by: Tim Harvey <tharvey at gateworks.com>
---
 arch/arm/boot/dts/imx6qdl-gw54xx.dtsi | 63 ++++++++++++++++++++++++++---------
 1 file changed, 47 insertions(+), 16 deletions(-)

diff --git a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
index 7b8bd61..e31356d 100644
--- a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
@@ -142,6 +142,11 @@
 	status = "okay";
 };
 
+&cpu0 {
+        arm-supply = <&reg_sw1a>;
+        soc-supply = <&reg_sw1c>;
+};
+
 &fec {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_enet>;
@@ -215,7 +220,8 @@
 		reg = <0x08>;
 
 		regulators {
-			sw1a_reg: sw1ab {
+			/* VDD_ARM */
+			reg_sw1a: sw1ab {
 				regulator-min-microvolt = <300000>;
 				regulator-max-microvolt = <1875000>;
 				regulator-boot-on;
@@ -223,7 +229,8 @@
 				regulator-ramp-delay = <6250>;
 			};
 
-			sw1c_reg: sw1c {
+			/* VDD_SOC */
+			reg_sw1c: sw1c {
 				regulator-min-microvolt = <300000>;
 				regulator-max-microvolt = <1875000>;
 				regulator-boot-on;
@@ -231,77 +238,89 @@
 				regulator-ramp-delay = <6250>;
 			};
 
-			sw2_reg: sw2 {
+			/* VDD_HIGH */
+			reg_sw2: sw2 {
 				regulator-min-microvolt = <800000>;
 				regulator-max-microvolt = <3950000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
-			sw3a_reg: sw3a {
+			/* VDD_DDR */
+			reg_sw3a: sw3a {
 				regulator-min-microvolt = <400000>;
 				regulator-max-microvolt = <1975000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
-			sw3b_reg: sw3b {
+			/* VDD_DDR */
+			reg_sw3b: sw3b {
 				regulator-min-microvolt = <400000>;
 				regulator-max-microvolt = <1975000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
-			sw4_reg: sw4 {
+			/* VDD_1P8 */
+			reg_sw4: sw4 {
 				regulator-min-microvolt = <800000>;
 				regulator-max-microvolt = <3300000>;
 			};
 
-			swbst_reg: swbst {
+			/* VDD_5P0 */
+			reg_swbst: swbst {
 				regulator-min-microvolt = <5000000>;
 				regulator-max-microvolt = <5150000>;
 			};
 
-			snvs_reg: vsnvs {
+			reg_snvs: vsnvs {
 				regulator-min-microvolt = <1000000>;
 				regulator-max-microvolt = <3000000>;
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
-			vref_reg: vrefddr {
+			/* VDD_VREF */
+			reg_vref: vrefddr {
 				regulator-boot-on;
 				regulator-always-on;
 			};
 
-			vgen1_reg: vgen1 {
+			/* VDD_PCIE-A_1P5 */
+			reg_vgen1: vgen1 {
 				regulator-min-microvolt = <800000>;
 				regulator-max-microvolt = <1550000>;
 			};
 
-			vgen2_reg: vgen2 {
+			/* VDD_PCIE-B_1P5 */
+			reg_vgen2: vgen2 {
 				regulator-min-microvolt = <800000>;
 				regulator-max-microvolt = <1550000>;
 			};
 
-			vgen3_reg: vgen3 {
+			/* unused */
+			reg_vgen3: vgen3 {
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <3300000>;
 			};
 
-			vgen4_reg: vgen4 {
+			/* VDD_AUD_1P8 */
+			reg_vgen4: vgen4 {
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <3300000>;
 				regulator-always-on;
 			};
 
-			vgen5_reg: vgen5 {
+			/* VDD_2P5 */
+			reg_vgen5: vgen5 {
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <3300000>;
 				regulator-always-on;
 			};
 
-			vgen6_reg: vgen6 {
+			/* unused */
+			reg_vgen6: vgen6 {
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <3300000>;
 				regulator-always-on;
@@ -325,7 +344,7 @@
 		compatible = "fsl,sgtl5000";
 		reg = <0x0a>;
 		clocks = <&clks 201>;
-		VDDA-supply = <&sw4_reg>;
+		VDDA-supply = <&reg_sw4>;
 		VDDIO-supply = <&reg_3p3v>;
 	};
 
@@ -380,6 +399,18 @@
 	status = "okay";
 };
 
+&reg_arm {
+        anatop-ldo-bypass;
+};
+
+&reg_soc {
+        anatop-ldo-bypass;
+};
+
+&reg_pu {
+        anatop-ldo-bypass;
+};
+
 &ssi1 {
 	fsl,mode = "i2s-slave";
 	status = "okay";
-- 
1.8.3.2