From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout-p-201.mailbox.org (mout-p-201.mailbox.org [80.241.56.171]) (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 975C43876A7; Thu, 6 Aug 2026 05:04:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.171 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785992678; cv=none; b=PqsyTkzGz01oxSWhbyNxz65nZ3Fxy38k9DMtbTNljLbuTdyWhE9t7hiYmJvgkZPAtqtLroO0DlGV7ywCDE6OcI5E9se0dzuV4pqkylyi4nXQu4u38NRSXmeRebMQp8csCiinKvVJqQGscY5pdzOkywwCJr/BhvoFxE13vBgdGWg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785992678; c=relaxed/simple; bh=ZlRtWwSiWeTzc8dy1cc7138SA92tWRevsVfqE9UAQ8g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uuZ3Pmapey0DWyZios21HWYefrFUR0DUjiVT7wfuF4BMIpCVydK03dnbmmH7iMA/hO4HrcqYKd13Hgeu+LkWpx8HLd22H+C8Vi+ehdfdWPRo80fRi/jAlkbffNGNU/CqYK3lfeDN3q7Yx76ejnjwPJCIXWA8DuTqbhPqWD/veKI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org; spf=pass smtp.mailfrom=mailbox.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b=xaWYeufG; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b=RAXkQDZG; arc=none smtp.client-ip=80.241.56.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mailbox.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="xaWYeufG"; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="RAXkQDZG" Received: from smtp102.mailbox.org (smtp102.mailbox.org [10.196.197.102]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-201.mailbox.org (Postfix) with ESMTPS id 4hFwDy02RtzMlKH; Thu, 06 Aug 2026 07:04:34 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1785992674; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=X8TDEET2Zk3KpA/Nyefnm7Snzq8lcliKm3gLsr1GrFw=; b=xaWYeufGXYE9aPu4s5HJiS3kWXk2keVENayU7+2XpAhAs22U1l7/iB8zWXns5I/5O8n3Kg Vn3PHfoJxG4BUhqPDEmN/F67gkOc+OvbHRV1eDYplYAPK3bEBL5oGPeJ3ROR3ddLDNOhvQ usgoqSNU4m+YJ7XLFm9c4ZuQvFWAfRcXrZO4rML15wqq52oDM5VlkqrQGmuS6AIBfwirg2 3X2SrVs/FYpQNHwT9B4qy6PBJ7hJWACzUtVdzAwEU8cWUFbOIH2oXJSaPBKo7foW4wbTX/ fhSjisBgioTSaEZCerNPT0Cv8D/np4DzI2snjKPSOSruclwSk277hEV/K383Gw== From: Marek Vasut DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1785992672; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=X8TDEET2Zk3KpA/Nyefnm7Snzq8lcliKm3gLsr1GrFw=; b=RAXkQDZGDL0TdwwCiTCIIsvv8OGnP1c1IKtNaytrDQN4fihMjhwrpxTpnKMHYDFJOjxt0x ReFN/lDxoXpe77YUYbk9BZZfN5J0almT9oC4yp6GZ7Tot1YEF2utOrcgHpyr8XKo/aMOJ7 7oOrbzIYaPRIMLP1GkdLZVgB6Tr/xJeMN3gXt8jtGnP8QeS/YNOgK7plwnYRGM7gdzsFt0 0lYUpyw/CaIcip54EvAxgdFjB01FO811zMYIOdZJ70vQvCo95eWcrYF3/bVkNytTljhumJ 6iGOc/aeoQuuSX1niyaCeBEtx8TiwgS+m3I8+pEfnz0RATI23tf3eWItaC7XmQ== To: linux-usb@vger.kernel.org Cc: Thanh Quan , Marek Vasut , Conor Dooley , Geert Uytterhoeven , Greg Kroah-Hartman , Krzysztof Kozlowski , Rob Herring , Thinh Nguyen , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 2/2] usb: dwc3: dwc3-generic-plat: Add Renesas R-Car Gen5 DWC3 xHCI USB controller glue Date: Thu, 6 Aug 2026 07:03:25 +0200 Message-ID: <20260806050422.324435-2-marek.vasut+renesas@mailbox.org> In-Reply-To: <20260806050422.324435-1-marek.vasut+renesas@mailbox.org> References: <20260806050422.324435-1-marek.vasut+renesas@mailbox.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-MBO-RS-ID: df215bace2f44bd5069 X-MBO-RS-META: q8yi4g4amt8kutoatn37kdbb7uk1g69u From: Thanh Quan The Renesas R-Car Gen5 SoC contains multiple instances of DWC3 USB controller with glue logic wrapper around them. Extend the generic DWC3 platform driver with Renesas R-Car Gen5 glue logic specifics. Signed-off-by: Thanh Quan Signed-off-by: Marek Vasut --- Cc: Conor Dooley Cc: Geert Uytterhoeven Cc: Greg Kroah-Hartman Cc: Krzysztof Kozlowski Cc: Rob Herring Cc: Thinh Nguyen Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org Cc: linux-usb@vger.kernel.org --- V2: Extend dwc3-generic-plat driver instead --- drivers/usb/dwc3/dwc3-generic-plat.c | 52 ++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) diff --git a/drivers/usb/dwc3/dwc3-generic-plat.c b/drivers/usb/dwc3/dwc3-generic-plat.c index ca69ac0eb07ce..518bb40d1372c 100644 --- a/drivers/usb/dwc3/dwc3-generic-plat.c +++ b/drivers/usb/dwc3/dwc3-generic-plat.c @@ -71,6 +71,52 @@ static int dwc3_eic7700_init(struct dwc3_generic *dwc3g) return 0; } +static int dwc3_renesas_rcar_gen5_init(struct dwc3_generic *dwc3g) +{ + struct device *dev = dwc3g->dev; + struct platform_device *pdev = to_platform_device(dev); + const char *maximum_speed; + bool use_usb3_flow; + void __iomem *glue; + int ret; + + glue = devm_platform_ioremap_resource_byname(pdev, "glue"); + if (IS_ERR(glue)) + return PTR_ERR(glue); + + ret = of_property_read_string(dev->of_node, "maximum-speed", &maximum_speed); + if (ret) + return dev_err_probe(dev, -ENODEV, "Failed to determine maximum speed\n"); + + use_usb3_flow = !strcmp(maximum_speed, "super-speed-plus") || + !strcmp(maximum_speed, "super-speed"); + + /* + * The datasheet describes initialization procedure without full + * information about the registers. Therefore, the source code is + * based on the bare metal code shared by the board team. + */ + writew(0x211, glue + 0x26); + + /* USB3 does not need additional register programming. */ + if (use_usb3_flow) + return 0; + + writew(0x11, glue + 0x81c); + writew(0x0, glue + 0x81a); + writew(0x1, glue + 0x802); + + usleep_range(10000, 20000); + + writew(0x0, glue + 0x802); + writew(0x1, glue + 0x2a); + writew(0x1, glue + 0x81a); + + usleep_range(10000, 20000); + + return 0; +} + static int dwc3_spacemit_k1_init(struct dwc3_generic *dwc3g) { struct device *dev = dwc3g->dev; @@ -231,11 +277,17 @@ static const struct dwc3_generic_config eic7700_dwc3 = { .properties = DWC3_DEFAULT_PROPERTIES, }; +static const struct dwc3_generic_config renesas_rcar_gen5_dwc3 = { + .init = dwc3_renesas_rcar_gen5_init, + .properties = DWC3_DEFAULT_PROPERTIES, +}; + static const struct of_device_id dwc3_generic_of_match[] = { { .compatible = "spacemit,k1-dwc3", &spacemit_k1_dwc3}, { .compatible = "spacemit,k3-dwc3", }, { .compatible = "fsl,ls1028a-dwc3", &fsl_ls1028_dwc3}, { .compatible = "eswin,eic7700-dwc3", &eic7700_dwc3}, + { .compatible = "renesas,rcar-gen5-dwc3", &renesas_rcar_gen5_dwc3}, { .compatible = "starfive,jhb100-dwc3", }, { /* sentinel */ } }; -- 2.53.0