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arm64: dts: qcom: sc7280: Add required-opps for USB

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USB has a requirement to put a performance state vote on 'cx'
while active. Use 'required-opps' to pass this information from
device tree, and since all the GDSCs in GCC (including USB) are
sub-domains of cx, we also add cx as a power-domain for GCC.
Now when any of the consumers of the GDSCs (in this case USB)
votes on a perforamance state, genpd framework can identify that
the GDSC itself does not support a performance state and it
then propogates the vote to the parent, which in this case is cx.

This change would also mean that any GDSC in GCC thats left enabled
during low power state (perhaps because its marked with a
ALWAYS_ON flag) can prevent the system from entering low power
since that would prevent cx from transitioning to low power.
Ideally any consumers that would need to have their devices
(partially) powered to support wakeups should look at making the
resp. GDSCs transtion to a Retention (PWRSTS_RET) state instead
of leaving them ALWAYS_ON.

Signed-off-by: Rajendra Nayak <quic_rjendra@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220916103124.30581-1-quic_rjendra@quicinc.com
This commit is contained in:
Rajendra Nayak 2022-09-16 16:01:24 +05:30 committed by Bjorn Andersson
parent 677920072e
commit 3d59187efc
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/boot/dts/qcom/sc7280.dtsi
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@ -829,6 +829,7 @@ gcc: clock-controller@100000 {
#clock-cells = <1>;
#reset-cells = <1>;
#power-domain-cells = <1>;
power-domains = <&rpmhpd SC7280_CX>;
};
ipcc: mailbox@408000 {
@ -3388,6 +3389,7 @@ usb_2: usb@8cf8800 {
"dm_hs_phy_irq";
power-domains = <&gcc GCC_USB30_SEC_GDSC>;
required-opps = <&rpmhpd_opp_nom>;
resets = <&gcc GCC_USB30_SEC_BCR>;
@ -3650,6 +3652,7 @@ usb_1: usb@a6f8800 {
"ss_phy_irq";
power-domains = <&gcc GCC_USB30_PRIM_GDSC>;
required-opps = <&rpmhpd_opp_nom>;
resets = <&gcc GCC_USB30_PRIM_BCR>;