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Commit 5aed4ee7 authored by Adam YH Lee's avatar Adam YH Lee Committed by Tony Lindgren
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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: default avatarAdam YH Lee <adam.yh.lee@gmail.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 3c20b827

arch/arm/boot/dts/am335x-pepper.dts

+9 −0
Original line number Original line Diff line number Diff line
@@ -438,6 +438,7 @@ 
	regulators {

	regulators {

		dcdc1_reg: regulator@0 {

		dcdc1_reg: regulator@0 {

			/* VDD_1V8 system supply */

			/* VDD_1V8 system supply */

			regulator-always-on;

		};

		};





		dcdc2_reg: regulator@1 {

		dcdc2_reg: regulator@1 {
@@ -446,6 +447,7 @@ 
			regulator-min-microvolt = <925000>;

			regulator-min-microvolt = <925000>;

			regulator-max-microvolt = <1325000>;

			regulator-max-microvolt = <1325000>;

			regulator-boot-on;

			regulator-boot-on;

			regulator-always-on;

		};

		};





		dcdc3_reg: regulator@2 {

		dcdc3_reg: regulator@2 {
@@ -454,25 +456,32 @@ 
			regulator-min-microvolt = <925000>;

			regulator-min-microvolt = <925000>;

			regulator-max-microvolt = <1150000>;

			regulator-max-microvolt = <1150000>;

			regulator-boot-on;

			regulator-boot-on;

			regulator-always-on;

		};

		};





		ldo1_reg: regulator@3 {

		ldo1_reg: regulator@3 {

			/* VRTC 1.8V always-on supply */

			/* VRTC 1.8V always-on supply */

			regulator-name = "vrtc,vdds";

			regulator-always-on;

			regulator-always-on;

		};

		};





		ldo2_reg: regulator@4 {

		ldo2_reg: regulator@4 {

			/* 3.3V rail */

			/* 3.3V rail */

			regulator-name = "vdd_3v3aux";

			regulator-always-on;

		};

		};





		ldo3_reg: regulator@5 {

		ldo3_reg: regulator@5 {

			/* VDD_3V3A 3.3V rail */

			/* VDD_3V3A 3.3V rail */

			regulator-name = "vdd_3v3a";

			regulator-min-microvolt = <3300000>;

			regulator-min-microvolt = <3300000>;

			regulator-max-microvolt = <3300000>;

			regulator-max-microvolt = <3300000>;

		};

		};





		ldo4_reg: regulator@6 {

		ldo4_reg: regulator@6 {

			/* VDD_3V3B 3.3V rail */

			/* VDD_3V3B 3.3V rail */

			regulator-name = "vdd_3v3b";

			regulator-always-on;

		};

		};

	};

	};

};

};