SOM_62A: Support for CPU core operating at 0.75V instead of 0.85V
Added by rune knutsen over 2 years ago
Short question: Does the SOM_62 and SOM_62A support 0.75V core operation? If yes, how is this selected.
BR Rune Knutsen
Replies (1)
RE: SOM_62A: Support for CPU core operating at 0.75V instead of 0.85V - Added by Jonathan Cormier over 2 years ago
Hi Rune,
The VDD_CORE voltage is set in the device tree and thus configured when the kernel loads.
To switch to 0.75V operation, regulator-min-microvolt and regulator-max-microvolt should be set to 750000.
tps65219: pmic@30 {
...
regulators {
buck1_reg: buck1 {
regulator-name = "VDD_CORE";
regulator-min-microvolt = <850000>;
regulator-max-microvolt = <850000>;
regulator-boot-on;
regulator-always-on;
};
And the following entry should be removed, as the 1.4Ghz mode requires VDD_CORE to be 0.85V
opp-table {
/* Add 1.4GHz OPP for am625-sk board. Requires VDD_CORE to be at 0.85V */
opp-1400000000 {
opp-hz = /bits/ 64 <1400000000>;
opp-supported-hw = <0x01 0x0004>;
clock-latency-ns = <6000000>;
};
};
We may eventually move the 1.4Ghz/0.85V OP mode to a device tree overlay as we do plan to support some slower speed grade variants so this will need to be more easily selectable.
