From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A55E23ACA7C; Mon, 31 Aug 2026 06:46:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788158794; cv=none; b=GaU4AGgKYMwUA6t9FfLcdI+g1bMmkRdHRRQzHpXeq6ZAMRxetdD884E++A2c4/j30RtJnfLEPQqU0HJEAny4fsl6Vw8xNyysuaCKtaptYPa/jEWpTPjplHvk/skAqEIjj6/pm3cyRMAWxrPC8OIUnKlDpFvqL5ArzGFpG20aKZE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788158794; c=relaxed/simple; bh=8j2UPxHbsbQKUt31JjMUVLrrajGaX1n7vJtbyO5pNrc=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=gkqEycyIxBFbNB5U8Vr4eZY3PJ1/9C0J+f5q3CMjoxpu/IhBJVFJSkrigyHpnOQ1FPVjpnXgdz7u1hL5fuQEb/xeIMcNoO7SXT7sglyDt9wlLqwefJvp8iV/KQRGGJuSdbnPh/7/OeQNrEhj2zrhnFRU1ga0FgMtEklC6tOon1o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=dFWKOF5J; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="dFWKOF5J" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3EC501F000E9; Mon, 31 Aug 2026 06:46:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788158793; bh=yiCZQi/KsfPhos3m9UPBMLZ/6VRkatgenlxPmXeCU1s=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=dFWKOF5JBsWRW0Ut0BH3FOS33DP30hPeVz+jynqpgAwHvHvEdyprLdM30wiiUPo/y Wxr6BIyBzbL3bO31f86ZFFPq6rwAUN1Fx5gaGE84JwtpTtRbIztEm8r33Jgx1V7Ixa ifulcECamQVwaC62/36RIFF0Q2OCmmyZzGCnM5SuExtFaDITDipDtGnWITU7urPabU ip2IoqgjnAlnUmyoR1gPNKLWEkWCyLZbgSqNfp+Cpqr/zzwFdrbVSMBsQtZuoiuR8B uYXNr2TbOr5JvUPrs6SW+IBoYbH7aFIuD2MKEiu2V5M5qxmtP/Y0FImDIX5K8oyNHs aDiezMykhuueQ== Date: Mon, 31 Aug 2026 08:46:29 +0200 From: Krzysztof Kozlowski To: Krishna Kurapati Cc: Vinod Koul , Neil Armstrong , Manivannan Sadhasivam , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thinh Nguyen , Greg Kroah-Hartman , linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org Subject: Re: [PATCH v6 1/5] dt-bindings: phy: Add PHY_TYPE_EUSB2 definition Message-ID: <20260831-visionary-capable-termite-3dae2a@quoll> References: <20260826-eusb2-interrupt-v6-v6-0-ae2601cfa80c@oss.qualcomm.com> <20260826-eusb2-interrupt-v6-v6-1-ae2601cfa80c@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260826-eusb2-interrupt-v6-v6-1-ae2601cfa80c@oss.qualcomm.com> On Wed, Aug 26, 2026 at 10:32:51PM +0530, Krishna Kurapati wrote: > eUSB2 (Embedded USB2) is a MIPI Alliance standard for chip-to-chip USB2 > signaling. Unlike standard USB2, which uses 3.3V signaling, eUSB2 uses > low-voltage differential signaling (~0.4V) and requires a repeater to > interface with external USB2 ports. Because of these differences, eUSB2 > PHY initialization sequences, voltage tuning, and register configuration > are distinct from USB2. > > Additionally, eUSB2 targets handle wakeup interrupts differently > depending on device speed when operating in host mode. According to the > eUSB2 specification, remote wakeup signaling in host mode is detected > via different data-line assertions based on the connected device speed: > > - Low-speed devices: the host repeater drives eD+ to logic '1' upon > detecting a K-state on the USB lines during remote wakeup (eUSB2 > spec, Section 5.5.14). > - Full-speed/high-speed devices: the host repeater drives eD- to > logic '1' upon detecting a K-state during remote wakeup (eUSB2 spec, > Sections 5.5.15 and 5.5.18). > > Since the eUSB2 PHY's DP and DM lines need to be configured differently > from USB2 PHYs, controllers should be able to query the PHY type and > configure wakeup interrupts accordingly. > > Add PHY_TYPE_EUSB2 to distinguish eUSB2 PHYs from standard USB2 PHYs. > > Signed-off-by: Krishna Kurapati > --- > include/dt-bindings/phy/phy.h | 1 + > 1 file changed, 1 insertion(+) Acked-by: Krzysztof Kozlowski Best regards, Krzysztof