ARM: dts: configure regulators for Gumstix Pepper

Boot process is halting in midway because some of the necessary voltage
regulators are deemed unused and subsequently powered off, leading to
a completely unresponsive system.

Most of the device nodes had correct voltage regulator attachments.
Yet these nodes had to set stricter enforcement on them through
'regulator-boot-on' and 'regulator-always-on' to function correctly.

The consumers of the regulators this commit affect are the followings:

	DCDC1: vdd_1v8 system supply, USB-PHY, and ADC
	DCDC2: Core domain
	DCDC3: MPU core domain
	 LDO1: RTC
	 LDO2: 3v3 IO domain
	 LDO3: USB-PHY; not a boot-time requirement
	 LDO4: LCD [16:23]

All but LDO3 need to be always-on for the system to be functional.

Additionally regulator-name properties have been added for the kernel to
display the name from the schematic. This will improve diagnostics.

Signed-off-by: Adam YH Lee <adam.yh.lee@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/boot/dts/am335x-pepper.dts b/arch/arm/boot/dts/am335x-pepper.dts
index 0d35ab6..661f835 100644 (file)
--- a/arch/arm/boot/dts/am335x-pepper.dts
+++ b/arch/arm/boot/dts/am335x-pepper.dts
@@ -438,6 +438,7 @@
        regulators {
                dcdc1_reg: regulator@0 {
                        /* VDD_1V8 system supply */
+                       regulator-always-on;
                };
 
                dcdc2_reg: regulator@1 {
@@ -446,6 +447,7 @@
                        regulator-min-microvolt = <925000>;
                        regulator-max-microvolt = <1325000>;
                        regulator-boot-on;
+                       regulator-always-on;
                };
 
                dcdc3_reg: regulator@2 {
@@ -454,25 +456,32 @@
                        regulator-min-microvolt = <925000>;
                        regulator-max-microvolt = <1150000>;
                        regulator-boot-on;
+                       regulator-always-on;
                };
 
                ldo1_reg: regulator@3 {
                        /* VRTC 1.8V always-on supply */
+                       regulator-name = "vrtc,vdds";
                        regulator-always-on;
                };
 
                ldo2_reg: regulator@4 {
                        /* 3.3V rail */
+                       regulator-name = "vdd_3v3aux";
+                       regulator-always-on;
                };
 
                ldo3_reg: regulator@5 {
                        /* VDD_3V3A 3.3V rail */
+                       regulator-name = "vdd_3v3a";
                        regulator-min-microvolt = <3300000>;
                        regulator-max-microvolt = <3300000>;
                };
 
                ldo4_reg: regulator@6 {
                        /* VDD_3V3B 3.3V rail */
+                       regulator-name = "vdd_3v3b";
+                       regulator-always-on;
                };
        };
 };