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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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-AM642") 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/arch/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 = "okay"; }; +&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 { serdes0_pcie_usb_link: phy@0 { reg = <0>; cdns,num-lanes = <1>; #phy-cells = <0>; cdns,phy-type = ; + cdns,ssc-mode = <2>; /* 2 for internal SSC */ resets = <&serdes_wiz0 1>; }; }; -- 2.51.1