arm64: dts: imx8mp-skov: operate CPU at 850 mV by default

The Skov i.MX8MP boards are passively cooled and heatsink is specced for
continuous operation at 1.2 GHz only. Short bouts of 1.6 GHz are ok,
but these should be invoked intentionally, not as part of
suspend/resume cycles.

Therefore, configure RUN frequency as 850 mV and remove the higher
voltage operating points from those permissible for suspend.

Fixes: 6d382d51d979 ("arm64: dts: freescale: Add SKOV IMX8MP CPU revB board")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi
index ee6ecd9dbc643a1eb9ab0cd88076cf446a330e60..5e3a7c859c6612fbe7d4c3b69c60c4a898550ff5 100644 (file)
--- a/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mp-skov-reva.dtsi
@@ -163,6 +163,19 @@ reg_vsd_3v3: regulator-vsd-3v3 {
        };
 };
 
+/*
+ * Board is passively cooled and heatsink is specced for continuous operation
+ * at 1.2 GHz only. Short bouts of 1.6 GHz are ok, but these should be done
+ * intentionally, not as part of suspend/resume cycles.
+ */
+&{/opp-table/opp-1600000000} {
+       /delete-property/ opp-suspend;
+};
+
+&{/opp-table/opp-1800000000} {
+       /delete-property/ opp-suspend;
+};
+
 &A53_0 {
        cpu-supply = <&reg_vdd_arm>;
 };
@@ -252,7 +265,7 @@ reg_vdd_arm: BUCK2 {
                                regulator-boot-on;
                                regulator-always-on;
                                regulator-ramp-delay = <3125>;
-                               nxp,dvs-run-voltage = <950000>;
+                               nxp,dvs-run-voltage = <850000>;
                                nxp,dvs-standby-voltage = <850000>;
                        };