[PATCH v2 01/13] arm64: dts: ti: k3-am642-hummingboard-t: fix USB clocking for compliance

Siddharth Vadapalli
2026-05-06T14:08:41Z

Fixes: e2b691804319 ("arm64: dts: ti: k3-am642-hummingboard-t: Convert overlay to board dts")
Fixes: bbef42084cc1 ("arm64: dts: ti: hummingboard-t: add overlays for m.2 pci-e and usb-3")
Cc: <stable@vger.kernel.org>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
Acked-by: Josua Mayer <josua@solid-run.com>
---

v1:
https://lore.kernel.org/r/20260505110631.1144200-2-s-vadapalli@ti.com/
Changes since v1:
- Collected Acked-by tag.

arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts
index ee9bd618f370..90a158531f60 100644
--- a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t-usb3.dts
@@ -15,6 +15,14 @@ / {
model = "SolidRun AM642 HummingBoard-T with USB-3.1 Gen 1";
};

+&serdes_wiz0 {
+ ti,core-clk-sel = <1>; /* Select internal reference clock */
+ ti,ssc-enable; /* Enable SSC */
+ ti,ssc-type = <1>; /* 1 for Downspread */
+ ti,ssc-frequency-hz = <33000>; /* 33 KHz */
+ ti,ssc-depth-per-mil = <5>; /* 0.5% depth */
+};
+
&serdes0 {
#address-cells = <1>;
#size-cells = <0>;
@@ -23,6 +31,7 @@ serdes0_link: phy@0 {
reg = <0>;
cdns,num-lanes = <1>;
cdns,phy-type = <PHY_TYPE_USB3>;
+ cdns,ssc-mode = <2>; /* 2 for internal SSC */
#phy-cells = <0>;
resets = <&serdes_wiz0 1>;
};
--
2.51.1