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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 --- 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 =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>; 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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 Acked-by: Wadim Egorov --- v1: https://lore.kernel.org/r/20260505110631.1144200-3-s-vadapalli@ti.com/ No changes since v1. 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>; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-4-s-vadapalli@ti.com/ No changes since v1. 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>; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-5-s-vadapalli@ti.com/ No changes since v1. 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>; 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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") Cc: Signed-off-by: Siddharth Vadapalli --- v1: https://lore.kernel.org/r/20260505110631.1144200-6-s-vadapalli@ti.com/ No changes since v1. 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>; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-7-s-vadapalli@ti.com/ No changes since v1. 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>; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-8-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-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..a5228a7d8339 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 @@ -1501,6 +1502,11 @@ &serdes_ln_ctrl { }; =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>; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-9-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-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..afd809104d1b 100644 --- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts +++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts @@ -970,6 +970,11 @@ &serdes_ln_ctrl { }; =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 */ status =3D "okay"; }; =20 @@ -997,6 +1002,7 @@ serdes0_usb_link: phy@3 { cdns,num-lanes =3D <1>; #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: fae14a1cb8dd ("arm64: dts: ti: Add k3-j721e-beagleboneai64") Cc: Signed-off-by: Siddharth Vadapalli --- v1: https://lore.kernel.org/r/20260505110631.1144200-10-s-vadapalli@ti.com/ No changes since v1. .../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 */ }; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-11-s-vadapalli@ti.com/ No changes since v1. 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>; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-12-s-vadapalli@ti.com/ No changes since v1. 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>; 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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 --- v1: https://lore.kernel.org/r/20260505110631.1144200-13-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-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..06b83e94da67 100644 --- a/arch/arm64/boot/dts/ti/k3-j722s-evm.dts +++ b/arch/arm64/boot/dts/ti/k3-j722s-evm.dts @@ -745,6 +745,11 @@ &serdes_ln_ctrl { }; =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 */ status =3D "okay"; }; =20 @@ -754,6 +759,7 @@ serdes0_usb_link: phy@0 { cdns,num-lanes =3D <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 --- 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 =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 { + 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 */ status =3D "okay"; }; =20 --=20 2.51.1