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
- 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
- Move ANX7688 DVDD1V8 (the chip input only, not the other things labeled DVDD1V8) from GPIO1-LDO to ALDO2
- 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:
- The always-on part of the ANX7688 chip (AVDD33, DVDD1V8) will always be powered
- 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)
- DLDO1 only needs to be enabled if the display pipeline or sensors are active, even if a USB cable is plugged in
Sensors
- This may or may not be a good idea, so it's a very weak suggestion: 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-IO) | 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) | 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.
- From LCD and LCD controller datasheets, this should be 1.8V.
- If DLDO2 is 3.3V, can we spread the HDMI/DSI/Sensors better across DLDO1 and DLDO2 so they can be more independent?
- Looks like this is N/A, because DLDO2 should be 1.8V.
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 |
Pins Held During Suspend
Pins Active During Suspend
Suggested Hardware Changes
- Connect WL-REG-ON (PL2) and WL-PMU-EN (WiFi).
- Connect the LIS3MDL DRDY pin, not INT pin, to PB1
- Reconnect LINEOUTN to make the line output differential.
- Replace WAKEUP_IN with AP_READY at PH8.
- Swap DTR (PL6, no level shift) and RI (PB2, level shift).
- Connect the modem PWRKEY to PB3 only, not STATUS.
- Connect the modem STATUS to a GPIO input (any pin bank is fine; this can reuse the level shifter previously connected to PL6).
- Disconnect the modem I2C. The level shifter can be repurposed for the next change (modem debug UART).
- Connect the modem debug UART TX/RX to PD0-1.
- Move the modem main UART TX/RX to PD2-3. Motor and CSI reset that are currently at PD2-3 would need to be moved elsewhere.
- Connect both AXP803 USB-DRVVBUS (populate R1300) and ANX7688 VBUS_CTRL to DRVVBUS (in addition to PD6). The signal would be driven by either PD6 or the ANX7688. If this is not possible, then prefer to at least connect AXP803 USB-DRVVBUS.
- Reorient the transistors for ANX_POWER (PD10) and ANX_RESET (PL9) so they do not invert their input, and produce a low-level output by default. (Since PL9 is already at 1.8V, it may no longer need a transistor.)
- Remove the transistors inverting VCONN1_EN and VCONN2_EN, and use a pull-up to DVDD1V8 (that is really already present) instead of the pull-up to 3V3.
Open Questions
- What exactly is the modem PWRKEY currently connected to? PB3? STATUS? DCDC1?