[PATCH v2 13/13] arm64: dts: ti: k3-j784s4-j742s2-evm-common: fix USB clocking for compliance

Siddharth Vadapalli
2026-05-06T14:10:18Z

Fixes: 39b623c05c46 ("arm64: dts: ti: Refactor J784s4-evm to a common file")
Fixes: bed97e94ee2d ("arm64: dts: ti: k3-j784s4-evm: Enable USB3 support")
Cc: <stable@vger.kernel.org>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
---

v1:
https://lore.kernel.org/r/20260505110631.1144200-14-s-vadapalli@ti.com/
Changes since v1:
- Reordered properties in serdes_wiz0 node to place status at the end.

arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
index ff3a85cbc524..43a74118e859 100644
--- a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-common.dtsi
@@ -1010,11 +1010,17 @@ serdes0_usb_link: phy@3 {
cdns,num-lanes = <1>;
#phy-cells = <0>;
cdns,phy-type = <PHY_TYPE_USB3>;
+ cdns,ssc-mode = <2>; /* 2 for internal SSC */
resets = <&serdes_wiz0 4>;
};
};

&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 */
status = "okay";
};

--
2.51.1