PinePhone Power Management

The data on this page is based on the the PinePhone v1.1 - Braveheart.

Regulators

Current Assignments

Name/GPIO	Output Voltage	Can disable at runtime?	Can disable in suspend?	Consumers (internal/external separated by semicolon)
DCDC1	3.3V	No	No (VCC-IO)	VCC-EFUSE, VCC-IO, VCC-PC (VQMMC2), VCC-PD, VCC-USB; Modem [I2C, PCM, UART], Motor, Pogo I2C, UART0, VMMC0, VMMC2, WiFi CHIP_EN
DCDC2	DVFS	No	Yes	VDD-CPUX
DCDC3	DVFS	N/A	N/A	VDD-CPUX (polyphase with DCDC2)
DCDC4	N/A	Yes	Yes	Not used
DCDC5	1.2V	No	Yes (future)	VCC-DRAM; DRAM
DCDC6	1.1V	No	Yes (future)	VDD-SYS
DC1SW	N/A	Yes	Yes	Not used
ALDO1	2.8V	Yes	Yes	VCC-PE; Camera AFVCC, Camera DOVDD, CSI I2C, Pogo I2C
ALDO2	1.8V	No	No (VCC-PL)	VCC-PL; Pogo INT
ALDO3	3.0V	No	No (KEYADC)	AVCC, KEYADC, VCC-PLL
DLDO1	3.3V	No	No (ANX7688 AVDD33)	HVCC, VCC-DSI; ANX7688 [AVDD33, HDMI_VT, I2C, ANX-V1.0 Enable, VCONN_EN Disable Pull-up], HDMI [DDC, HPD], Proximity LED, Sensor I2C, Sensor VDD
DLDO2	1.8V? 3.3V?	Yes	Yes	MIPI-DSI VIO
DLDO3	2.8V	Yes	Yes	Camera AVDD
DLDO4	1.8V-3.3V	Yes	Yes	VCC-PG; VQMMC1
ELDO1	1.8V	No	No (DRAM)	CPVDD; DRAM
ELDO2	N/A	Yes	Yes	Not used
ELDO3	1.8V	Yes	Yes	Camera DVDD
FLDO1	1.2V	Yes	Yes	HSIC-VCC (not used)
FLDO2	1.1V	No	No (VDD-CPUS)	VDD-CPUS
GPIO0-LDO	3.3V	Yes	Yes	Backlight PWM, LCD, Proximity sensor VDD, Touchscreen [I2C, VCC]
GPIO1-LDO	1.8V	No	No (ANX7688 DVDD1V8)	ANX7688 [AVDD1V8, DVDD1V8, CC, HDMI DDC, I2C, Power/Reset pull-up]
PD6	5.0V	Yes	Yes	USB OTG
PD8	5.0V	Yes	Yes	Pogo supply, USB OTG via PD6
PD9	5.0V	Yes	Yes	VCONN (USB Type C)
PH10	PWM	Yes	Yes	Backlight
PL7	VBAT	Yes	Yes	Modem
ANX-V1.0	1.0V	Yes	Yes	ANX7688 [AVDD1V0, DVDD1V0]

Suggested Hardware Changes

ANX7688

1. Move ANX7688 AVDD33 (the chip input only, not the other things connected to 3v3) and ANX7688 I2C Level Shift (3.3V side) from DLD01 to DCDC1
2. Move ANX7688 DVDD1V8 (the chip input only, not the other things labeled DVDD1V8) from GPIO1-LDO to ALDO2
3. Move ANX7688 ANX-V1.0 Regulator Enable and ANX7688 VCONN_EN Disable Pull-up from DLDO1 to GPIO1-LDO

The result of these changes would be that:

1. The always-on part of the ANX7688 chip (AVDD33, DVDD1V8) will always be powered
2. GPIO1-LDO only needs to be powered when a USB cable is detected, and is enough to power the rest of the chip (except HDMI)
3. DLDO1 only needs to be enabled if the display pipeline or sensors are active, even if a USB cable is plugged in

Sensors

1. Swap the VDD and LEDA inputs of the STK3311-A sensor, moving VDD to DLDO1 and LEDA to GPIO0-LDO. The sensor VDD needs to match the I2C voltage, and the LED driver should be on a separate power supply from the sensors. There is some concern, because GPIO0-LDO has a 100mA limit, but the proximity sensor should work properly at the lowest LED drive current (12.5mA).

Assignments after Suggested Changes

Note: Only regulators that were modified are included here.

Name/GPIO	Output Voltage	Can disable at runtime?	Can disable in suspend?	Consumers (internal/external separated by semicolon)
DCDC1	3.3V	No	No	VCC-EFUSE, VCC-IO, VCC-PC (VQMMC2), VCC-PD, VCC-USB; ANX7688 [AVDD33, I2C], Modem [I2C, PCM, UART], Motor, Pogo I2C, UART0, VMMC0, VMMC2, WiFi CHIP_EN
ALDO2	1.8V	No	No	VCC-PL; ANX7688 [DVDD1V8], Pogo INT
DLDO1	3.3V	Yes	Yes	HVCC, VCC-DSI; ANX7688 [HDMI_VT], HDMI [DDC, HPD], Proximity sensor VDD, Sensor I2C, Sensor VDD
GPIO0-LDO	3.3V	Yes	Yes	Backlight PWM, LCD, Proximity LED, Touchscreen [I2C, VCC]
GPIO1-LDO	1.8V	Yes	Yes	ANX7688 [ANX-V1.0 Enable, AVDD1V8, CC, HDMI DDC, I2C, Power/Reset pull-up, VCONN_EN Disable Pull-up]

Open Questions

• How is ANX1.8V actually powered? from GPIO1-LDO or PS or both?
• Is DLDO2 supposed to be 1.8V or 3.3V? The schematic says both in different places.
• If DLDO2 is 3.3V, can we spread the HDMI/DSI/Sensors better across DLDO1 and DLDO2 so they can be more independent?

Software Updates Needed

Drivers that Need Regulator Consumers

• LCD Panel for VCC-LCD
• MIPI-DSI/DPHY/Panel for MIPI-DSI VIO
• STK3311-A

Drivers that Need to Suspend Regulators

• STK3311-A
• LIS3MDL
• MPU6050
• Goodix touchscreen
• sunxi pinctrl (maybe)
• USB PHY

GPIO

Current Modem Pin Assignments

Note: only pins relevant to power management are included in this table.

Pin	Signal Name	Description	Direction (as modem)	Needed in suspend?	Connected to
1	WAKEUP_IN	Drive low to wake up the modem	I	No	PH7 (active high)
2	AP_READY	Drive high/low to signal the A64 is ready to receive URCs	I	No (if held)	NC
4	W_DISABLE#	Drive low to enter Airplane Mode	I	No (if held/tristate)	PH8 (active high)
20	RESET_N	Drive low to reset the modem	I	No (if held/tristate)	PC4 (active high)
21	PWRKEY	Drive low to turn the modem on/off	I	No (if held/tristate)	PB3 (active high)
61	STATUS	Open drain output, pulled low when the modem is on	O	No	PB3
62	RI	Pulled low to request host wakeup	O	Yes	PB2
66	DTR	Drive low to wake up the modem	I	No	PL6 (active low)

Current Port L Pin Assignments

Pin	Signal Name	Description	Direction	Needed in suspend?
PL0	PMU-SCK	AXP803 I2C/RSB Clock	O	Yes
PL1	PMU-SDA	AXP803 I2C/RSB Data	I/O	Yes
PL2	WL-REG-ON	Not Connected	N/A	N/A
PL3	WL-WAKE-AP	Wake-on-WLAN Interrupt	I	Yes
PL4	BT-RST-N	Bluetooth Reset Control	O	No (if held)
PL5	BT-WAKE-AP	Wake-on-BT Interrupt	I	Yes
PL6	DTR	Modem DTR (Wakeup Request)	O	No
PL7	4G-PWR-BAT	Modem Power Supply Control	O	No (if held)
PL8	ANX7688-CABLE_DET	ANX7688 Cable Detection Interrupt	I	Yes
PL9	ANX_RESET	ANX7688 Reset Control	O	No (if held)
PL10	LCD-PWM	LCD Backlight PWM Brightness Control	O	No
PL11	ANX7688-INT	ANX7688 Alert Interrupt	I	Yes
PL12	POGO-INT	Pogo Pin Interrupt	I	Yes

Open Questions

• What exactly is the modem PWRKEY connected to?