From patchwork Mon Jun 24 09:15:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 11012689 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6A4F6112C for ; Mon, 24 Jun 2019 09:18:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5886A28AF3 for ; Mon, 24 Jun 2019 09:18:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 49AA028AE8; Mon, 24 Jun 2019 09:18:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id DB9BF28AE8 for ; Mon, 24 Jun 2019 09:18:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=90TTKm1rMooTL9WAeG2KEdXW3ZUNJbFEA1l1GyNIOcQ=; b=eV+qztgBY6AqX3 LGJvv/yhb04wlMppIUP7E31IpP338WiT6CZv3N+5faEniTutK12+c2o6Ssoy7Q4CsBXqpYKu7SKyo r8NuEqwcK9W89j0enYuTaBbd5fkdDTw53BBu+cPRQvcyJpdf4GsN72U4l86OkzpgI8bJFzHE1GNOR 3o9rdYznNxyjIDAaFDpypig03bKoNXuQ/YuYS0f5BFtlfkNc92KqzB1VY3su931hekRM9ZjZAs8Sl Sq7n8uWOrINwS7rfB+V+2Dg4PYcon4L/iURyj/mQKDuaCjZEenksIfF54WaQUBh/+VsXwYKhokcyV x4UkFA+XwF8e7TQI7JfA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hfL7V-0003dp-54; Mon, 24 Jun 2019 09:18:37 +0000 Received: from hqemgate16.nvidia.com ([216.228.121.65]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hfL5H-00029V-2r for linux-arm-kernel@lists.infradead.org; Mon, 24 Jun 2019 09:16:21 +0000 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 24 Jun 2019 02:16:18 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Mon, 24 Jun 2019 02:16:18 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Mon, 24 Jun 2019 02:16:18 -0700 Received: from HQMAIL108.nvidia.com (172.18.146.13) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 24 Jun 2019 09:16:18 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 24 Jun 2019 09:16:17 +0000 Received: from vidyas-desktop.nvidia.com (Not Verified[10.24.37.38]) by hqnvemgw02.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Mon, 24 Jun 2019 02:16:18 -0700 From: Vidya Sagar To: , , , , , , , , , , Subject: [PATCH V11 08/12] dt-bindings: Add PCIe supports-clkreq property Date: Mon, 24 Jun 2019 14:45:01 +0530 Message-ID: <20190624091505.1711-9-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190624091505.1711-1-vidyas@nvidia.com> References: <20190624091505.1711-1-vidyas@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1561367778; bh=8ZphodPWQndLX5xNWc3glJDuk6F8PeLMPjv2f0Ie8FM=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=RLxPWmAJNBwA2KO5yfL0Za4tdJD4soYSOwuOOcp6nkEZoAoNpP5ronLIHzIbLIIkW Bwv0iwlQ4/qBDRuw/1pe/oRC5pIu2T3HtbZtg+uvay24bATHCKjMt5Ezna/qSK6gs1 DjJ/OSibDqrPd4FBL3/t2vXVj4Vd2OznzSJ1XKJpdi4I2/1u/Z72wpt/Wt8tgzUs5o 5LK2n6HfWNYmJOSRJOJsJAEoMNGcj07fOCIDhJ7feBF30BQZ/+siEvrMhkCn0TXUrA xnEGgS6dw10+wPQ+Zz0UkiuveSgFT4iFzj0i1GKwzebvybpqztYof+d7b81udsCJ+2 tWVBydnPLjXpg== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190624_021619_297072_96760586 X-CRM114-Status: UNSURE ( 7.94 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, mmaddireddy@nvidia.com, kthota@nvidia.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, mperttunen@nvidia.com, linux-tegra@vger.kernel.org, digetx@gmail.com, vidyas@nvidia.com, linux-arm-kernel@lists.infradead.org, sagar.tv@gmail.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Some host controllers need to know the existence of clkreq signal routing to downstream devices to be able to advertise low power features like ASPM L1 substates. Without clkreq signal routing being present, enabling ASPM L1 sub states might lead to downstream devices falling off the bus. Hence a new device tree property 'supports-clkreq' is added to make such host controllers aware of clkreq signal routing to downstream devices. Signed-off-by: Vidya Sagar Reviewed-by: Rob Herring Reviewed-by: Thierry Reding --- Changes since [v10]: * None Changes since [v9]: * None Changes since [v8]: * None Changes since [v7]: * None Changes since [v6]: * None Changes since [v5]: * s/Documentation\/devicetree/dt-bindings/ in the subject Changes since [v4]: * None Changes since [v3]: * Rebased on top of linux-next top of the tree Changes since [v2]: * None Changes since [v1]: * This is a new patch in v2 series Documentation/devicetree/bindings/pci/pci.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt index 92c01db610df..d132f9efeb3e 100644 --- a/Documentation/devicetree/bindings/pci/pci.txt +++ b/Documentation/devicetree/bindings/pci/pci.txt @@ -24,6 +24,11 @@ driver implementation may support the following properties: unsupported link speed, for instance, trying to do training for unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2' for gen2, and '1' for gen1. Any other values are invalid. +- supports-clkreq: + If present this property specifies that CLKREQ signal routing exists from + root port to downstream device and host bridge drivers can do programming + which depends on CLKREQ signal existence. For example, programming root port + not to advertise ASPM L1 Sub-States support if there is no CLKREQ signal. PCI-PCI Bridge properties -------------------------