From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail11.truemail.it (mail11.truemail.it [217.194.8.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D6B383446C4; Tue, 5 May 2026 11:09:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.194.8.81 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777979368; cv=none; b=WIVgIsdtJvbwgOb5a2a/w6bKD4vojHXCyQzlGj+kX2o0bqE387hdtizyVhfxzykgCoRC+QAmnSpG7+BIWKnqV+q1Gy4M6Tp33wCycwv8Jh4BPTp4fazpMFV/U7PGAf2D2H1L0nOJtQt87Dnx+9I/v050fEXAK9Eg1u68D016v8I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777979368; c=relaxed/simple; bh=4i14OH/AGTZ3Xez8hQqKkmlkTRotJdH0t0791P79zuo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=HvMBnrkRrnooWf5Li61J4qizxZgo5GEKfkm3QgGsEBYF6rbxKfy41wKGkHfl6b1tw6kbtG6ciaZ0v9NeyonlyNtupttxgoAYSVV5ABfttfraWGPUYHtxo8FOu+HW569RqlVpUGT/6940avwB4PqllBzQ1q0JWwaeBcc3QFqsZFc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it; spf=pass smtp.mailfrom=dolcini.it; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b=ahuSEwFq; arc=none smtp.client-ip=217.194.8.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=dolcini.it Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=dolcini.it Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=dolcini.it header.i=@dolcini.it header.b="ahuSEwFq" Received: from francesco-nb (248.201.173.83.static.wline.lns.sme.cust.swisscom.ch [83.173.201.248]) by mail11.truemail.it (Postfix) with ESMTPA id 354AC1FCE7; Tue, 5 May 2026 13:09:24 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=dolcini.it; s=default; t=1777979365; bh=IVJfobToIIbQS+LK3dO6loNuJTGbzehi/g6dvyC5Lo8=; h=From:To:Subject; b=ahuSEwFqljaHr1P6lJsEoyZmO0bWCVLmwjY4uM/I1oxqM1w5hl+bm3Kq/pfYrqkf8 2wZKUOIGPUMteNwkiITvj+0Vcfqmo0ovLNnReEgh2+8lpQJZ7gxsAPYhAJjMMy51Gx Zoz5CKDpTU+gF8YQdYvt3eF6sC4RoerU41r5zEb/XfDI1b9zuw4fXJ+gkB1tcOWHXY zZThRIdhGwwhYfMY15YVyr85Nrh6MgTUMK7/kHJmm0/XhPa/SuocPCCsk6l3pmmIDQ FMSZn1qJP0BmTP/gVTFfwuw4arUtzilATcAGoa6EJtwWmvFlsqOambbUhgdOO0ZD/0 /nzVsil2cGSjA== Date: Tue, 5 May 2026 13:09:22 +0200 From: Francesco Dolcini To: Siddharth Vadapalli Cc: nm@ti.com, vigneshr@ti.com, kristo@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, josua@solid-run.com, w.egorov@phytec.de, matthias.schiffer@ew.tq-group.com, d.haller@phytec.de, francesco.dolcini@toradex.com, joao.goncalves@toradex.com, emanuele.ghidoli@toradex.com, ernest.vanhoecke@toradex.com, rogerq@kernel.org, eballetb@redhat.com, robertcnelson@gmail.com, afd@ti.com, u-kumar1@ti.com, stable@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, luis.parga@ti.com, srk@ti.com Subject: Re: [PATCH 12/13] arm64: dts: ti: k3-j722s-evm: fix USB clocking for compliance Message-ID: <20260505110922.GB69476@francesco-nb> References: <20260505110631.1144200-1-s-vadapalli@ti.com> <20260505110631.1144200-13-s-vadapalli@ti.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260505110631.1144200-13-s-vadapalli@ti.com> On Tue, May 05, 2026 at 04:36:13PM +0530, Siddharth Vadapalli wrote: > 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 { > > &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 */ before status