ARM: dts: configure regulators for Gumstix Pepper
PATCH v2 1/1 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.
--- arch/arm/boot/dts/am335x-pepper.dts | 9 +++++++++ 1 file changed, 9 insertions(+)
arch/arm/boot/dts/am335x-pepper.dts +9 -0
@@ -438,6 +438,7 @@ regulators { dcdc1_reg: regulator at 0 { /* VDD_1V8 system supply */ + regulator-always-on; }; dcdc2_reg: regulator at 1 {
@@ -446,6 +447,7 @@ regulator-min-microvolt = <925000>; regulator-max-microvolt = <1325000>; regulator-boot-on; + regulator-always-on; }; dcdc3_reg: regulator at 2 {
@@ -454,25 +456,32 @@ regulator-min-microvolt = <925000>; regulator-max-microvolt = <1150000>; regulator-boot-on; + regulator-always-on; }; ldo1_reg: regulator at 3 { /* VRTC 1.8V always-on supply */ + regulator-name = "vrtc,vdds"; regulator-always-on; }; ldo2_reg: regulator at 4 { /* 3.3V rail */ + regulator-name = "vdd_3v3aux"; + regulator-always-on; }; ldo3_reg: regulator at 5 { /* VDD_3V3A 3.3V rail */ + regulator-name = "vdd_3v3a"; regulator-min-microvolt = <3300000>; regulator-max-microvolt = <3300000>; }; ldo4_reg: regulator at 6 { /* VDD_3V3B 3.3V rail */ + regulator-name = "vdd_3v3b"; + regulator-always-on; }; }; };
Signature · 1 line
2.1.4
PATCH v2 1/1 ARM: dts: configure regulators for Gumstix Pepper
Quoted 18 lines · Adam YH Lee
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_1v8system 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]
Quoted 4 lines
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.
Thanks for updating the description, applying this into omap-for-v4.2/fixes.
Tony