mirror of
https://github.com/andreili/SBC_builder.git
synced 2025-08-24 03:14:06 +02:00
83 lines
2.5 KiB
Diff
83 lines
2.5 KiB
Diff
From c402714c643950ffe020804c98bb8e23e31ae050 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= <megi@xff.cz>
|
|
Date: Wed, 23 Sep 2020 14:59:41 +0200
|
|
Subject: power: supply: axp20x_battery: Setup thermal regulation
|
|
(experimental)
|
|
|
|
Values for NTC resistances were pulled out of thin air!
|
|
|
|
None of this is tested to actually work.
|
|
|
|
Signed-off-by: Ondrej Jirman <megi@xff.cz>
|
|
---
|
|
drivers/power/supply/axp20x_battery.c | 53 +++++++++++++++++++++++++++
|
|
1 file changed, 53 insertions(+)
|
|
|
|
diff --git a/drivers/power/supply/axp20x_battery.c b/drivers/power/supply/axp20x_battery.c
|
|
index f19ab493245b..1bac1a934614 100644
|
|
--- a/drivers/power/supply/axp20x_battery.c
|
|
+++ b/drivers/power/supply/axp20x_battery.c
|
|
@@ -1146,6 +1146,59 @@ static int axp20x_power_probe(struct platform_device *pdev)
|
|
*/
|
|
axp20x_get_constant_charge_current(axp20x_batt, &axp20x_batt->max_ccc);
|
|
|
|
+ if (of_machine_is_compatible("pine64,pinephone-1.2") > 0 ||
|
|
+ of_machine_is_compatible("pine64,pinephone-1.1") > 0 ||
|
|
+ of_machine_is_compatible("pine64,pinephone-1.0") > 0) {
|
|
+ // 3kOhm NTC inside PinePhone batery
|
|
+ // ---------------------------------
|
|
+ //
|
|
+ // Charging:
|
|
+ // 0 - 15 °C: Max 0.2C CC to 4.35V : 9750 Ohm - 4710 Ohm
|
|
+ // 15 - 50 °C: Max 0.5C CC to 4.35V : 4710 Ohm - 1080 Ohm
|
|
+ //
|
|
+ // Discharging:
|
|
+ // -10 °C : 16500 Ohm
|
|
+ // 55 °C : 896 Ohm
|
|
+ // enable TS pin input to ADC
|
|
+
|
|
+ dev_info(dev, "Configuring battery thermal regulation for Pinephone\n");
|
|
+
|
|
+ ret = regmap_update_bits(axp20x_batt->regmap, 0x82, BIT(0), BIT(0));
|
|
+ if (ret)
|
|
+ goto warn_bat;
|
|
+
|
|
+ // safety thresholds:
|
|
+
|
|
+ // voltage = reg_val * 12800 uV (range is 0 - 3.264V)
|
|
+ ret = regmap_write(axp20x_batt->regmap, 0x38, 9750 * 80 / 12800); // V_LTF-charge
|
|
+ if (ret)
|
|
+ goto warn_bat;
|
|
+
|
|
+ ret = regmap_write(axp20x_batt->regmap, 0x39, 1080 * 80 / 12800); // V_HTF-charge
|
|
+ if (ret)
|
|
+ goto warn_bat;
|
|
+
|
|
+ ret = regmap_write(axp20x_batt->regmap, 0x3c, 16500 * 80 / 12800); // V_LTF-work
|
|
+ if (ret)
|
|
+ goto warn_bat;
|
|
+
|
|
+ ret = regmap_write(axp20x_batt->regmap, 0x3d, 896 * 80 / 12800); // V_HTF-work
|
|
+ if (ret)
|
|
+ goto warn_bat;
|
|
+
|
|
+ // There is a hysteresis of 460.8 mV(refer to TS pin voltage) for UTP
|
|
+ // threshold, and there is a hysteresis of 57.6 mV for OTP threshold.
|
|
+
|
|
+ // use TS pin only when charging, make it affect the charger, I = 80uA
|
|
+ ret = regmap_update_bits(axp20x_batt->regmap, 0x84, 0x37, 0x31);
|
|
+ if (ret)
|
|
+ goto warn_bat;
|
|
+ }
|
|
+
|
|
+ return 0;
|
|
+
|
|
+warn_bat:
|
|
+ dev_err(dev, "Failed to configure battery thermal regulation\n");
|
|
return 0;
|
|
}
|
|
|
|
--
|
|
2.35.3
|
|
|