| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <baseboard/variants.h> |
| |
| /* |
| * Psys_pmax considerations |
| * |
| * Given the hardware design in taranza, the serial shunt resistor is 0.01ohm. |
| * The full scale of hardware PSYS signal 1.6v maps to system current 6.009A |
| * instead of real system power. The equation is shown below: |
| * PSYS = 1.6v ~= (0.01ohm x 6.009A) x 50 (INA213, gain 50V/V) x R631/(R631 + R638) |
| * R631/(R631 + R638) = 0.5325 = 36K / (36K + 31.6K) |
| * |
| * The Psys_pmax is a SW setting which tells IMVP9.1 the mapping between system input |
| * current and the actual system power. Since there is no voltage information |
| * from PSYS, different voltage input would map to different Psys_pmax settings: |
| * For Type-C 15V, the Psys_pmax should be 15v x 6.009A = 90.135W |
| * For Type-C 20V, the Psys_pmax should be 20v x 6.009A = 120.18W |
| * For a barrel jack, the Psys_pmax should be 19v x 6.009A = 114.171W |
| * |
| * Imagine that there is a type-c 100W (20V/5A) connected to DUT w/ full loading, |
| * and the Psys_pmax setting is 120W. Then IMVP9.1 can calculate the current system |
| * power = 120W * 5A / 6.009A = 100W, which is the actual system power. |
| */ |
| const struct psys_config psys_config = { |
| .efficiency = 97, |
| .psys_imax_ma = 6009, |
| .bj_volts_mv = 19000, |
| .bj_power_w = 65, |
| }; |
| |
| void variant_devtree_update(void) |
| { |
| variant_update_psys_power_limits(&psys_config); |
| } |