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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: e2b691804319 ("arm64: dts: ti: k3-am642-hummingboard-t: Convert over= lay to board dts") Fixes: bbef42084cc1 ("arm64: dts: ti: hummingboard-t: add overlays for m.2 = pci-e and usb-3") Cc: Signed-off-by: Siddharth Vadapalli Acked-by: Josua Mayer --- 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 =3D "SolidRun AM642 HummingBoard-T with USB-3.1 Gen 1"; }; =20 +&serdes_wiz0 { + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ +}; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: c48ac0efe6d7 ("arm64: dts: ti: Add support for phyBOARD-Electra-AM64= 2") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts b/arc= h/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts index 793538f94942..a85d7d08bd1b 100644 --- a/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts +++ b/arch/arm64/boot/dts/ti/k3-am642-phyboard-electra-rdk.dts @@ -439,12 +439,21 @@ &sdhci1 { status =3D "okay"; }; =20 +&serdes_wiz0 { + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ +}; + &serdes0 { serdes0_pcie_usb_link: phy@0 { reg =3D <0>; cdns,num-lanes =3D <1>; #phy-cells =3D <0>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ resets =3D <&serdes_wiz0 1>; 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charset="utf-8" From: Luis Parga According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 4e8aa4e3559a ("arm64: dts: ti: k3-am642-sk: Enable USB Super-Speed H= OST port") Cc: Signed-off-by: Luis Parga Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am642-sk.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am642-sk.dts b/arch/arm64/boot/dts/t= i/k3-am642-sk.dts index d28a38c87f32..9f63fea5e6a4 100644 --- a/arch/arm64/boot/dts/ti/k3-am642-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am642-sk.dts @@ -463,6 +463,11 @@ &serdes_refclk { =20 &serdes_wiz0 { bootph-all; + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &serdes0 { @@ -473,6 +478,7 @@ serdes0_usb_link: phy@0 { cdns,num-lanes =3D <1>; #phy-cells =3D <0>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ resets =3D <&serdes_wiz0 1>; }; }; --=20 2.51.1 From nobody Sat Jun 13 21:04:07 2026 Received: from CH5PR02CU005.outbound.protection.outlook.com (mail-northcentralusazon11012029.outbound.protection.outlook.com [40.107.200.29]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8551531A7E4; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 4717a36f31ec ("arm64: dts: ti: Add TQ-Systems TQMa64XxL SoM and MBaX= 4XxL carrier board Device Trees") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts b/arch/= arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts index 46be6824dd16..e5d1b2ebf2c8 100644 --- a/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts +++ b/arch/arm64/boot/dts/ti/k3-am642-tqma64xxl-mbax4xxl.dts @@ -504,6 +504,14 @@ &serdes_refclk { bootph-all; }; =20 +&serdes_wiz0 { + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ +}; + &serdes0 { serdes0_usb_link: phy@0 { reg =3D <0>; @@ -512,6 +520,7 @@ serdes0_usb_link: phy@0 { bootph-all; cdns,num-lanes =3D <1>; cdns,phy-type =3D ; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 8bc3b1c86452 ("arm64: dts: ti: Add basic support for phyBOARD-Izar-A= M68x") Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts b/arch/arm64/= boot/dts/ti/k3-am68-phyboard-izar.dts index 225fe7a7803b..d9b61e426ff8 100644 --- a/arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts +++ b/arch/arm64/boot/dts/ti/k3-am68-phyboard-izar.dts @@ -505,6 +505,14 @@ &serdes_refclk { clock-frequency =3D <100000000>; }; =20 +&serdes_wiz0 { + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ +}; + &serdes0 { status =3D "okay"; =20 @@ -522,6 +530,7 @@ serdes0_usb_link: phy@1 { #phy-cells =3D <0>; resets =3D <&serdes_wiz0 2>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ }; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 067878e6cd25 ("arm64: dts: ti: k3-am68-sk: Add DT node for USB") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts b/arch/arm64/= boot/dts/ti/k3-am68-sk-base-board.dts index 8178333fb2b4..d44c3685503c 100644 --- a/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts +++ b/arch/arm64/boot/dts/ti/k3-am68-sk-base-board.dts @@ -793,6 +793,14 @@ &serdes_refclk { clock-frequency =3D <100000000>; }; =20 +&serdes_wiz0 { + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ +}; + &serdes0 { status =3D "okay"; =20 @@ -810,6 +818,7 @@ serdes0_usb_link: phy@2 { cdns,num-lanes =3D <1>; #phy-cells =3D <0>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ resets =3D <&serdes_wiz0 3>; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 39ac6623b1d8 ("arm64: dts: ti: Add Aquila AM69 Support") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi b/arch/arm64/boot/d= ts/ti/k3-am69-aquila.dtsi index 5119baf62a4c..7c98ee81ccb5 100644 --- a/arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi +++ b/arch/arm64/boot/dts/ti/k3-am69-aquila.dtsi @@ -1423,6 +1423,7 @@ serdes0_usb0_ss_link: phy@3 { resets =3D <&serdes_wiz0 4>; cdns,num-lanes =3D <1>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ }; }; =20 @@ -1502,6 +1503,11 @@ &serdes_ln_ctrl { =20 &serdes_wiz0 { status =3D "okay"; + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &serdes_wiz1 { --=20 2.51.1 From nobody Sat Jun 13 21:04:07 2026 Received: from BN1PR04CU002.outbound.protection.outlook.com (mail-eastus2azon11010030.outbound.protection.outlook.com [52.101.56.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C45A041C2E5; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: ff7b5e93f16a ("arm64: dts: ti: k3-am69-sk: Add USB SuperSpeed suppor= t") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-am69-sk.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-am69-sk.dts b/arch/arm64/boot/dts/ti= /k3-am69-sk.dts index e56772a334c5..0412552a927f 100644 --- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts @@ -971,6 +971,11 @@ &serdes_ln_ctrl { =20 &serdes_wiz0 { status =3D "okay"; + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &serdes0 { @@ -997,6 +1002,7 @@ serdes0_usb_link: phy@3 { cdns,num-lanes =3D <1>; #phy-cells =3D <0>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ resets =3D <&serdes_wiz0 4>; }; }; --=20 2.51.1 From nobody Sat Jun 13 21:04:07 2026 Received: from DM1PR04CU001.outbound.protection.outlook.com (mail-centralusazon11010011.outbound.protection.outlook.com [52.101.61.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 92619382F17; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: fae14a1cb8dd ("arm64: dts: ti: Add k3-j721e-beagleboneai64") Cc: Signed-off-by: Siddharth Vadapalli --- .../arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts b/arch/arm6= 4/boot/dts/ti/k3-j721e-beagleboneai64.dts index 8040b6528c18..1e87c6cf146a 100644 --- a/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts +++ b/arch/arm64/boot/dts/ti/k3-j721e-beagleboneai64.dts @@ -578,6 +578,11 @@ &serdes_ln_ctrl { &serdes_wiz3 { typec-dir-gpios =3D <&main_gpio1 3 GPIO_ACTIVE_LOW>; typec-dir-debounce-ms =3D <700>; /* TUSB321, tCCB_DEFAULT 133 ms */ + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &serdes3 { @@ -586,6 +591,7 @@ serdes3_usb_link: phy@0 { cdns,num-lanes =3D <2>; #phy-cells =3D <0>; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 02c35dca2b48 ("arm64: dts: ti: k3-j721e: Enable Super-Speed support = for USB0") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts b/arch/a= rm64/boot/dts/ti/k3-j721e-common-proc-board.dts index 53e7fbcef52b..b25bce995b64 100644 --- a/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts +++ b/arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts @@ -531,6 +531,11 @@ &serdes_ln_ctrl { &serdes_wiz3 { typec-dir-gpios =3D <&main_gpio1 3 GPIO_ACTIVE_HIGH>; typec-dir-debounce-ms =3D <700>; /* TUSB321, tCCB_DEFAULT 133 ms */ + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &serdes3 { @@ -539,6 +544,7 @@ serdes3_usb_link: phy@0 { cdns,num-lanes =3D <2>; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 1bfda92a3a36 ("arm64: dts: ti: Add support for J721E SK") Cc: Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-j721e-sk.dts | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j721e-sk.dts b/arch/arm64/boot/dts/t= i/k3-j721e-sk.dts index 689ba2ff81f7..79927a34edff 100644 --- a/arch/arm64/boot/dts/ti/k3-j721e-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-j721e-sk.dts @@ -960,6 +960,11 @@ &serdes_ln_ctrl { &serdes_wiz3 { typec-dir-gpios =3D <&main_gpio1 3 GPIO_ACTIVE_HIGH>; typec-dir-debounce-ms =3D <700>; /* TUSB321, tCCB_DEFAULT 133 ms */ + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &serdes3 { @@ -968,6 +973,7 @@ serdes3_usb_link: phy@0 { cdns,num-lanes =3D <2>; #phy-cells =3D <0>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ resets =3D <&serdes_wiz3 1>, <&serdes_wiz3 2>; 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charset="utf-8" From: Luis Parga According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 485705df5d5f ("arm64: dts: ti: k3-j722s: Enable PCIe and USB support= on J722S-EVM") Cc: Signed-off-by: Luis Parga Signed-off-by: Siddharth Vadapalli --- arch/arm64/boot/dts/ti/k3-j722s-evm.dts | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts b/arch/arm64/boot/dts/= ti/k3-j722s-evm.dts index e66330c71593..de62b7e135c6 100644 --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts @@ -746,6 +746,11 @@ &serdes_ln_ctrl { =20 &serdes_wiz0 { status =3D "okay"; + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &serdes0 { @@ -754,6 +759,7 @@ serdes0_usb_link: phy@0 { cdns,num-lanes =3D <1>; #phy-cells =3D <0>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ resets =3D <&serdes_wiz0 1>; }; 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charset="utf-8" According to section "6.5.3 Normative Spread Spectrum Clocking (SSC)" of the USB 3.2 Specification, SSC should be enabled by default. This protects against EMI violations. Hence, enable internal SSC for USB SuperSpeed. Fixes: 39b623c05c46 ("arm64: dts: ti: Refactor J784s4-evm to a common file") Fixes: bed97e94ee2d ("arm64: dts: ti: k3-j784s4-evm: Enable USB3 support") Cc: Signed-off-by: Siddharth Vadapalli --- 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..0884773ad230 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 @@ -1010,12 +1010,18 @@ serdes0_usb_link: phy@3 { cdns,num-lanes =3D <1>; #phy-cells =3D <0>; cdns,phy-type =3D ; + cdns,ssc-mode =3D <2>; /* 2 for internal SSC */ resets =3D <&serdes_wiz0 4>; }; }; =20 &serdes_wiz0 { status =3D "okay"; + ti,core-clk-sel =3D <1>; /* Select internal reference clock */ + ti,ssc-enable; /* Enable SSC */ + ti,ssc-type =3D <1>; /* 1 for Downspread */ + ti,ssc-frequency-hz =3D <33000>; /* 33 KHz */ + ti,ssc-depth-per-mil =3D <5>; /* 0.5% depth */ }; =20 &usb_serdes_mux { --=20 2.51.1