From patchwork Tue Apr 23 08:27:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 10912251 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 C4AF3161F for ; Tue, 23 Apr 2019 08:30:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AD72628831 for ; Tue, 23 Apr 2019 08:30:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AAE8928830; Tue, 23 Apr 2019 08:30:12 +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 576712883C for ; Tue, 23 Apr 2019 08:30:12 +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=CBDgMtYNyqDa5N40ZBu9JCIVPCOz1aqTEwuYGkuzuRU=; b=Hc12c3VLwPZFsJ Uwb6sKuUkhCW7hh3bCWMQSf2jQU9wPEeir1BCBaEUxl5gS7e5OtSd9jCgs4/JRic+sgZw6De+arch 3wEvhHGP0XyCEaKAtlJLufqTlU8+VXxU8EjzZSFvGGePu+ks4KfKlQ7DiYzfgEAdeBYLy5OgP4Cur 3d1AeE46ULO6ANt+Cx48aMl6ufd4c5c/gCUII52mJUqBeDTU9wou2e6xwYiC1gh15EGSTv9JD4tNr DFD7TZu0uakb4JiCHVcl+suH0y3kscSwTm56HSNJmt7s6dz9jrVG+8C6AroP+2n1Y0bjn5yjDhIyK 40WSroDMu0vBYpIZ/Tfg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIqoa-0005RO-0j; Tue, 23 Apr 2019 08:30:08 +0000 Received: from hqemgate15.nvidia.com ([216.228.121.64]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hIqnB-0003D7-0k for linux-arm-kernel@lists.infradead.org; Tue, 23 Apr 2019 08:28:45 +0000 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 23 Apr 2019 01:28:16 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Tue, 23 Apr 2019 01:28:40 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Tue, 23 Apr 2019 01:28:40 -0700 Received: from HQMAIL104.nvidia.com (172.18.146.11) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 23 Apr 2019 08:28:40 +0000 Received: from hqnvemgw02.nvidia.com (172.16.227.111) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 23 Apr 2019 08:28:40 +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 ; Tue, 23 Apr 2019 01:28:40 -0700 From: Vidya Sagar To: , , , , , , , , , , Subject: [PATCH V4 09/16] Documentation/devicetree: Add PCIe supports-clkreq property Date: Tue, 23 Apr 2019 13:57:23 +0530 Message-ID: <20190423082730.370-10-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190423082730.370-1-vidyas@nvidia.com> References: <20190423082730.370-1-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=1556008096; bh=ghDB46m7MQmbP30Yt7OzC1k71/KVBendJlvfWTbSp8c=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=i0P1u3eyL6JjGNP7BjoeJ12e3hRokt8xbbi6D+8a0geXCClzNljaoQf5nY5j5lLPv E6E4R0N6ia5KY5Bg1f5jKq6pj2Jfe4q8Q28LmhQa+fl9UpsA9wvqAu0I6AHp5iawc5 DHrVEtwNnRGqOYhUTr6JmfT+6Tp98q+c/ayI+hVkod+kpbhYujMnmpmTYdoi8FhvQh TkGQrFv1bNANf5L+JmjgDFNkBAfm73vuA/s6OviIB5HcEMve2nmuZxnRcdJSIG6GII q6Zu5G9qN47NeuRFOv7g9bUaiKXKT1zHBDZ4EHjorEqbL4B/VwKPhH5rOicDxMDRX/ V7k95sTe3xWfw== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190423_012841_630985_C26F3A91 X-CRM114-Status: UNSURE ( 8.18 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 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, 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 --- 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 -------------------------