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 Regulator 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, and ANX7688 VCONN_EN Disable Pull-up (R1355 and R1366) from DLDO1 to ANX1.8V
Move ANX7688 ANX1.8V from GPIO1-LDO to ALDO2- Move ANX7688 ANX-V1.0 Regulator Enable (R1352) from DLDO1 to a GPIO
These are all medium priority.
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
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 (R1309) or PS (U1301) 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.
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 GPIO Hardware Changes
- Connect WL-REG-ON (PL2) to WL-PMU-EN (WiFi). bugfix
- Connect the LIS3MDL DRDY pin, not INT pin, to PB1. bugfix
- Reconnect LINEOUTN to make the line output differential.
- Connect PH7 to AP_READY instead of WAKEUP_IN. Since the A64 needs to drive this pin high (no pull-up on the modem side), this uses the level shifter channel previously used by RI (U1503 channel 4).
- Swap DTR (was at PL6, now at PB2 with U1503 channel 3 level shift) and RI (was at PB2, now at PL6 with no level shift, but a pull-up to ALDO2 on the A64 side*). partly a bugfix
- Connect the modem PWRKEY to PB3 only, not STATUS or DCDC1 (depopulate R1526). bugfix
- Connect the modem STATUS to PH9. This is an open-drain signal, so it needs a pull-up on the A64 side. bugfix
- 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).
Connecting to ANX7688 VBUS_CTRL would need a level shift to 1.8V.- Alternatively, swap PL9 and PD6, so the level shift is not necessary, since PL9 is already a 1.8V logic level.
Alternatively, do not connect ANX7688 VBUS_CTRL*, and at least populate R1300 to connect AXP803 USB-DRVVBUS*.- Reorient the transistors for ANX_POWER (PD10) and ANX_RESET (PL9) so they do not invert their input, and (more importantly) 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.
Note: Changes 1-7 and 11 are high priority. Changes 12-13 are medium priority. Changes 8-10 are low priority.
* There should be at least one pin where the default value at boot changes, due to being pulled differently, for use in distinguishing the hardware revisions. In v1.1, PL6 reads 0 at boot. Since RI is an active-low interrupt, it needs a pull up. And it doesn’t need any level translation. So that’s our perfect opportunity. If PL6 reads low at boot, it’s a v1.1 device; if PL6 reads high at boot, it’s a v1.2 device.
Open Questions
- What exactly is the modem PWRKEY currently connected to? PB3? STATUS? DCDC1?
- Currently STATUS pin is connected to PWRKEY and to PB3. STATUS can’t be read reliably since voltage divider from R1526 and R1517 places the STATUS signal at 0V or 0.5Vcc-IO, which is unspecified input value according to A64 datasheet (Vih is 0.7Vcc-IO, Vil is 0.3*Vcc-IO, the range in between is unspecified).
