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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/ti/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 = <&main_gpio1 3 GPIO_ACTIVE_HIGH>; typec-dir-debounce-ms = <700>; /* TUSB321, tCCB_DEFAULT 133 ms */ + 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 */ }; &serdes3 { @@ -968,6 +973,7 @@ serdes3_usb_link: phy@0 { cdns,num-lanes = <2>; #phy-cells = <0>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ resets = <&serdes_wiz3 1>, <&serdes_wiz3 2>; bootph-all; }; @@ -1006,12 +1012,21 @@ &usb0 { bootph-all; }; +&serdes_wiz2 { + 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 */ +}; + &serdes2 { serdes2_usb_link: phy@1 { reg = <1>; cdns,num-lanes = <1>; #phy-cells = <0>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ resets = <&serdes_wiz2 2>; }; }; -- 2.51.1