From patchwork Fri May 28 06:29:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongxing Zhu X-Patchwork-Id: 1485027 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256 header.s=nselector3 header.b=dfk1Tcam; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4FrwGN3WDgz9sSn for ; Fri, 28 May 2021 16:47:08 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230348AbhE1Gsk (ORCPT ); Fri, 28 May 2021 02:48:40 -0400 Received: from inva020.nxp.com ([92.121.34.13]:48632 "EHLO inva020.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229665AbhE1Gsj (ORCPT ); Fri, 28 May 2021 02:48:39 -0400 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 24B201A35B5; Fri, 28 May 2021 08:47:04 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 inva020.eu-rdc02.nxp.com 24B201A35B5 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=nselector3; t=1622184424; bh=21r/3Ha2KwM1oZ30mKtfCuC/zWbmRZbOa780Bt3dfZE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dfk1Tcamfh1gL/kM834kRA8N2eGYYR99HxNAybw0k+NnBFyLL894tKdVcF7MxbNzc 8YiyvOXHL9EBoQXxI2eaHP7ZjpdC39gSAw4F5tjVog//LOxddwbts8Ubc+BJYUJVNI OlSxS5knrXIj+20I49CjxzMhMG/h7OHZiMUqHFLpMaZf60mW9rDiiE/zT8ax78vXpT DSgt2G19+iWSpJHFn3S4P/UiC8jy/2wAYttkW8x/ebTAJ37osOQ4EZXL3nCUC1v/u7 6a3t2pbY6QEgQWf8sAsuwA35VsvlX2/+fNnJOGwZB4T4NIKha3rC95l+eCF9BaQ/O6 oMLxrPfI+04OA== Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 0AA3C1A1EA7; Fri, 28 May 2021 08:46:59 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 inva020.eu-rdc02.nxp.com 0AA3C1A1EA7 Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id 83CEF402F6; Fri, 28 May 2021 14:46:52 +0800 (+08) From: Richard Zhu To: l.stach@pengutronix.de, andrew.smirnov@gmail.com, shawnguo@kernel.org, kw@linux.com, bhelgaas@google.com, stefan@agner.ch, lorenzo.pieralisi@arm.com Cc: linux-pci@vger.kernel.org, linux-imx@nxp.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, Richard Zhu Subject: [PATCH v5 1/2] dt-bindings: imx6q-pcie: Add "vph-supply" for PHY supply voltage Date: Fri, 28 May 2021 14:29:42 +0800 Message-Id: <1622183383-3287-2-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1622183383-3287-1-git-send-email-hongxing.zhu@nxp.com> References: <1622183383-3287-1-git-send-email-hongxing.zhu@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The i.MX8MQ PCIe PHY can use either a 1.8V or a 3.3V power supply. Add a "vph-supply" property to indicate which regulator supplies power for the PHY. Signed-off-by: Richard Zhu Reviewed-by: Lucas Stach --- Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt index de4b2baf91e8..d8971ab99274 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt @@ -38,6 +38,9 @@ Optional properties: The regulator will be enabled when initializing the PCIe host and disabled either as part of the init process or when shutting down the host. +- vph-supply: Should specify the regulator in charge of VPH one of the three + PCIe PHY powers. This regulator can be supplied by both 1.8v and 3.3v voltage + supplies. Additional required properties for imx6sx-pcie: - clock names: Must include the following additional entries: From patchwork Fri May 28 06:29:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongxing Zhu X-Patchwork-Id: 1485028 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=nxp.com header.i=@nxp.com header.a=rsa-sha256 header.s=nselector3 header.b=acXL8vz6; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4FrwGR1fZWz9sSn for ; Fri, 28 May 2021 16:47:11 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233807AbhE1Gsm (ORCPT ); Fri, 28 May 2021 02:48:42 -0400 Received: from inva020.nxp.com ([92.121.34.13]:48778 "EHLO inva020.nxp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230281AbhE1Gsk (ORCPT ); Fri, 28 May 2021 02:48:40 -0400 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 2D0A01A1EB1; Fri, 28 May 2021 08:47:05 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 inva020.eu-rdc02.nxp.com 2D0A01A1EB1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nxp.com; s=nselector3; t=1622184425; bh=/BToe/FFxBv0yDcLV2BovJaTgPClfSEPLPNvXr5XpSM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=acXL8vz6i7GF7bAITiD8k3FdG93sp7U1wkhpNbDn1NinZDcEgkp5ZU6yvZd9yhT5c 0Cr0A+E3GfcEPCE/H1E/3tr/9VkOL15CakloqIPL2ntD0+0J0gN7zfHaD770y7+ZbY atco/QeGirOn2/TO/Fblj0Jr9AlnL1p+MrJX9efPBY9GCEgSxMH7GXQmvAHrET68OW nymadA1fjsrWkgLp6PHFq+hj9dpamT3+QOyacLRVvfiODE1NTzGfE6+Kg5uqEQFtwe 6t69P4FR41YQG8wZ9FavVwkao5PiJbzM2BZraFZ9u4dRqIlfuMtFRyKTmGsl2PAFpl T/XzEtDUBBr6A== Received: from invc005.ap-rdc01.nxp.com (invc005.ap-rdc01.nxp.com [165.114.16.14]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id 1311B1A1EA3; Fri, 28 May 2021 08:47:00 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 inva020.eu-rdc02.nxp.com 1311B1A1EA3 Received: from localhost.localdomain (shlinux2.ap.freescale.net [10.192.224.44]) by invc005.ap-rdc01.nxp.com (Postfix) with ESMTP id AF1B940319; Fri, 28 May 2021 14:46:53 +0800 (+08) From: Richard Zhu To: l.stach@pengutronix.de, andrew.smirnov@gmail.com, shawnguo@kernel.org, kw@linux.com, bhelgaas@google.com, stefan@agner.ch, lorenzo.pieralisi@arm.com Cc: linux-pci@vger.kernel.org, linux-imx@nxp.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel@pengutronix.de, Richard Zhu Subject: [PATCH v5 2/2] PCI: imx6: Enable PHY internal regulator when supplied >3V Date: Fri, 28 May 2021 14:29:43 +0800 Message-Id: <1622183383-3287-3-git-send-email-hongxing.zhu@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1622183383-3287-1-git-send-email-hongxing.zhu@nxp.com> References: <1622183383-3287-1-git-send-email-hongxing.zhu@nxp.com> X-Virus-Scanned: ClamAV using ClamSMTP Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The i.MX8MQ PCIe PHY needs 1.8V in default but can be supplied by either a 1.8V or a 3.3V regulator. The "vph-supply" DT property tells us which external regulator supplies the PHY. If that regulator supplies anything over 3V, enable the PHY's internal 3.3V-to-1.8V regulator. Signed-off-by: Richard Zhu Reviewed-by: Lucas Stach --- drivers/pci/controller/dwc/pci-imx6.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 853ea8e82952..94b43b4ecca1 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -37,6 +37,7 @@ #define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9) #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10) #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11) +#define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12) #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8) #define IMX8MQ_PCIE2_BASE_ADDR 0x33c00000 @@ -80,6 +81,7 @@ struct imx6_pcie { u32 tx_swing_full; u32 tx_swing_low; struct regulator *vpcie; + struct regulator *vph; void __iomem *phy_base; /* power domain for pcie */ @@ -621,6 +623,17 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) imx6_pcie_grp_offset(imx6_pcie), IMX8MQ_GPR_PCIE_REF_USE_PAD, IMX8MQ_GPR_PCIE_REF_USE_PAD); + /* + * Regarding the datasheet, the PCIE_VPH is suggested + * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the + * VREG_BYPASS should be cleared to zero. + */ + if (imx6_pcie->vph && + regulator_get_voltage(imx6_pcie->vph) > 3000000) + regmap_update_bits(imx6_pcie->iomuxc_gpr, + imx6_pcie_grp_offset(imx6_pcie), + IMX8MQ_GPR_PCIE_VREG_BYPASS, + 0); break; case IMX7D: regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, @@ -1130,6 +1143,13 @@ static int imx6_pcie_probe(struct platform_device *pdev) imx6_pcie->vpcie = NULL; } + imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph"); + if (IS_ERR(imx6_pcie->vph)) { + if (PTR_ERR(imx6_pcie->vph) != -ENODEV) + return PTR_ERR(imx6_pcie->vph); + imx6_pcie->vph = NULL; + } + platform_set_drvdata(pdev, imx6_pcie); ret = imx6_pcie_attach_pd(dev);