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| author | Tim Chen <tim-chen@quanta.corp-partner.google.com> | 2020-12-01 10:04:04 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2021-01-15 11:22:13 +0000 |
| commit | 77a7520385242bd2c9e323ecc74490b383c22f5e (patch) | |
| tree | 60dcbfdc75203e7fc94f21d715ba5b398930c42a /Documentation/lib | |
| parent | 9d20c84460093db15445540359e5362bfc914d1a (diff) | |
mb/google/dedede/var/metaknight: Add LTE power on/off sequence
LTE module used in metaknight has a specific power on/off sequence.
GPIOs related to power sequence are:
* GPP_A10 - LTE_PWR_OFF_R_ODL
* GPP_H17 - LTE_RESET_R_ODL
1. Power on: GPP_A10 -> 20ms -> GPP_H17
2. Power off: GPP_H17 -> 10ms -> GPP_A10
3. Warm reset: GPP_A10 keeps high, GPP_H17 goes low at least 2ms
Configure the GPIOs based on these requirements.
BUG=b:173671094
TEST=Build and boot Metaknight to OS. Ensure that the LTE module power
sequence requirements are met.
Change-Id: Ibff16129dfe2f1de2b1519049244aba4b3123e52
Signed-off-by: Tim Chen <tim-chen@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48195
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Diffstat (limited to 'Documentation/lib')
0 files changed, 0 insertions, 0 deletions