AM625: u-boot: default cup frequency?

Please refer to the e2e
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1299915/am625-how-to-force-the-am6254-run-as-1-2g-hz/4940124#4940124

Best,
-Hong

Hi Hong,

Thanks for sharing previous discussion.

It give info about how to set clock in early boot.

My concern is any mechanism in u-boot  to choose frequency scaling governor like in kernel?

which CPU frequency is chosen from the opp-table ?

k3-am625.dtsi :

        a53_opp_table: opp-table {
                compatible = "operating-points-v2-ti-cpu";
                opp-shared;
                syscon = <&wkup_conf>;

                opp-200000000 {
                        opp-hz = /bits/ 64 <200000000>;
                        opp-supported-hw = <0x01 0x0007>;
                        clock-latency-ns = <6000000>;
                };

                 ...

                .....

                opp-1250000000 {
                        opp-hz = /bits/ 64 <1250000000>;
                        opp-supported-hw = <0x01 0x0004>;
                        clock-latency-ns = <6000000>;
                        opp-suspend;
                };
        };

Thanks,

Gireesh Hiremath

I don't think there's user case on doing dynamic frequency scaling during boot phase, like u-boot.
Instead the A53 frequency is configured in the board DTS as necessary.
Best,
-Hong

Hi Hong,

Thanks for the suggestion. I will include it.

from previous DTS suggestion ( https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1299915/am625-how-to-force-the-am6254-run-as-1-2g-hz/4940124#4940124)

assigned-clock-rates = <200000000>, <1250000000>;

if it is fixed to 1250000000 Hz then what is the need of 200000000Hz and

what is the use of this patch  https://git.ti.com/cgit/ti-u-boot/ti-u-boot/diff/arch/arm/dts/k3-am625.dtsi?h=ti-u-boot-2023.04&id=1474cc8c27d45110d2b2d82cb24aec12fbc73767

Regards,

Gireesh Hiremath

Hi Hong,

Any update?

Regards,

Gireesh Hiremath