Re: [PATCH 12/13] arm64: dts: ti: k3-j722s-evm: fix USB clocking for compliance

[Francesco Dolcini]

On Tue, May 05, 2026 at 04:36:13PM +0530, Siddharth Vadapalli wrote:
> From: Luis Parga <luis.parga@xxxxxx>
> 
> 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: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Luis Parga <luis.parga@xxxxxx>
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@xxxxxx>
> ---
>  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 {
>  
>  &serdes_wiz0 {
>  	status = "okay";
> +	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 */

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