From patchwork Mon Jul 29 09:28:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Siddharth Vadapalli X-Patchwork-Id: 13744665 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BAEDEC3DA4A for ; Mon, 29 Jul 2024 09:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=j0A5DuPXCW8kIo64gE9NE0q15LdOr6ia0mr3YO2tDiE=; b=o2Nv+Yn8m5qGGO9XzeXiIiLeWD Oh1pwQ5EA9VJEWXB+SbsstLjLzkGD+zbtM9IL2lPAn3Tzj1DpD6piuXw4aQmHtlyXtYdQZcJwGPJl V5ZzYOmoj8GoGfGt5dnBX1YcHf7uxCfAsQRs/6doXaBlbTrfhqPq5va6SHvaUMsKXLYfDarX3Rfgq ohbsX2LXH5ZkUV7C3g3Wde38eBRuWG/shUxrq/v6pnuZ6JlnMsAALU7Uyy6gnijQ/0kuHC77kuCEi ZEQgK+MrDS44JivaP/daBSee1tYxkaqvgNUV2Xixldv+vhZhV/qfCNSXm0lKSGVsXx8p4ri+cIuGj EImNddjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYMi5-0000000Ai0T-0DCl; Mon, 29 Jul 2024 09:30:29 +0000 Received: from lelv0142.ext.ti.com ([198.47.23.249]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sYMgx-0000000AhXC-2aOn for linux-arm-kernel@lists.infradead.org; Mon, 29 Jul 2024 09:29:21 +0000 Received: from fllv0034.itg.ti.com ([10.64.40.246]) by lelv0142.ext.ti.com (8.15.2/8.15.2) with ESMTP id 46T9TAFq025699; Mon, 29 Jul 2024 04:29:10 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1722245351; bh=j0A5DuPXCW8kIo64gE9NE0q15LdOr6ia0mr3YO2tDiE=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=ptnM+vYCSP3W5J4ergRrCNVP2ogB73Urza0NPpwrqElM1a7ITx2Mb/yyr3/ULlax8 Ibsw1DK99iseGHjYsgB+6h8N/VjN0Tm0CEZ0YvS9JuiJaRBc6AvChlMPbQnrninAf1 atdgdZ4dqyyLMwpN2kyLlpfanfvdHFa21GTgAioc= Received: from DLEE107.ent.ti.com (dlee107.ent.ti.com [157.170.170.37]) by fllv0034.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 46T9TAsA025888 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 29 Jul 2024 04:29:10 -0500 Received: from DLEE109.ent.ti.com (157.170.170.41) by DLEE107.ent.ti.com (157.170.170.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23; Mon, 29 Jul 2024 04:29:10 -0500 Received: from lelvsmtp5.itg.ti.com (10.180.75.250) by DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.2507.23 via Frontend Transport; Mon, 29 Jul 2024 04:29:10 -0500 Received: from uda0492258.dhcp.ti.com (uda0492258.dhcp.ti.com [10.24.72.81]) by lelvsmtp5.itg.ti.com (8.15.2/8.15.2) with ESMTP id 46T9Stc7087068; Mon, 29 Jul 2024 04:29:06 -0500 From: Siddharth Vadapalli To: , , , , , , , CC: , , , , , Subject: [PATCH v2 2/2] PCI: j721e: Enable ACSPCIE Refclk if "ti,syscon-acspcie-proxy-ctrl" exists Date: Mon, 29 Jul 2024 14:58:55 +0530 Message-ID: <20240729092855.1945700-3-s-vadapalli@ti.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240729092855.1945700-1-s-vadapalli@ti.com> References: <20240729092855.1945700-1-s-vadapalli@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240729_022919_796834_5B9E44DE X-CRM114-Status: GOOD ( 16.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The ACSPCIE module is capable of driving the reference clock required by the PCIe Endpoint device. It is an alternative to on-board and external reference clock generators. Enabling the output from the ACSPCIE module's PAD IO Buffers requires clearing the "PAD IO disable" bits of the ACSPCIE_PROXY_CTRL register in the CTRL_MMR register space. Add support to enable the ACSPCIE reference clock output using the optional device-tree property "ti,syscon-acspcie-proxy-ctrl". Signed-off-by: Siddharth Vadapalli --- v1: https://lore.kernel.org/r/20240715120936.1150314-4-s-vadapalli@ti.com/ Changes since v1: - Addressed Bjorn's feedback at: https://lore.kernel.org/r/20240725211841.GA859405@bhelgaas/ with the following changes: 1) Updated $subject and commit message to indicate that this patch enables ACSPCIE reference clock output if the DT property is present. 2) Updated macro and comments to indicate that the BITS correspond to disabling ACSPCIE output, due to which clearing them enables the reference clock output. 3) Replaced "PAD" with "refclk" both in the function name and in the error prints. 4) Wrapped lines to be within the 80 character limit to match the rest of the driver. drivers/pci/controller/cadence/pci-j721e.c | 38 ++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index 85718246016b..ed42b2229483 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -44,6 +44,7 @@ enum link_status { #define J721E_MODE_RC BIT(7) #define LANE_COUNT(n) ((n) << 8) +#define ACSPCIE_PAD_DISABLE_MASK GENMASK(1, 0) #define GENERATION_SEL_MASK GENMASK(1, 0) struct j721e_pcie { @@ -220,6 +221,34 @@ static int j721e_pcie_set_lane_count(struct j721e_pcie *pcie, return ret; } +static int j721e_enable_acspcie_refclk(struct j721e_pcie *pcie, + struct regmap *syscon) +{ + struct device *dev = pcie->cdns_pcie->dev; + struct device_node *node = dev->of_node; + u32 mask = ACSPCIE_PAD_DISABLE_MASK; + struct of_phandle_args args; + u32 val; + int ret; + + ret = of_parse_phandle_with_fixed_args(node, + "ti,syscon-acspcie-proxy-ctrl", + 1, 0, &args); + if (!ret) { + /* Clear PAD IO disable bits to enable refclk output */ + val = ~(args.args[0]); + ret = regmap_update_bits(syscon, 0, mask, val); + if (ret) + dev_err(dev, "failed to enable ACSPCIE refclk: %d\n", + ret); + } else { + dev_err(dev, + "ti,syscon-acspcie-proxy-ctrl has invalid arguments\n"); + } + + return ret; +} + static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) { struct device *dev = pcie->cdns_pcie->dev; @@ -259,6 +288,15 @@ static int j721e_pcie_ctrl_init(struct j721e_pcie *pcie) return ret; } + /* Enable ACSPCIE refclk output if the optional property exists */ + syscon = syscon_regmap_lookup_by_phandle_optional(node, + "ti,syscon-acspcie-proxy-ctrl"); + if (syscon) { + ret = j721e_enable_acspcie_refclk(pcie, syscon); + if (ret) + return ret; + } + return 0; }