From patchwork Mon May 13 05:06:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 10940269 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 E7290933 for ; Mon, 13 May 2019 05:08:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D793E2654B for ; Mon, 13 May 2019 05:08:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CB5F526E40; Mon, 13 May 2019 05:08:30 +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 78D092654B for ; Mon, 13 May 2019 05:08:30 +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=Qi5wF3LqqsOeDGQqyT6apii8XBqo8fXmorhYWhTGumw=; b=fLBsDdgrdiN4BO MV0to7py77Dpk0DPeHpYV/QiHx/froVJgF5+6e4+UxM/xWozeCfOJwL/HJvW7VxFZbEAs6Rdn5Uo2 GMQmksKCslHWjbTx7IatqJXpX0HbgTaj6G8nQsVWrpdmuKl/SRIptXfCQj0yFWAEsY5hYSI44mmom P4/At7tFAE+1gSPYFMu/bjr7Y15uKoyFDV404dsPGCLBsIooSUx1UIlWwC+gCaYzm/odqbnf1bC8e BOhhlMhXw3MFnQmgS+IC2uIqJnQcb3oLEzmjUcQece38lC8BNff3HW2GPBErwqMOLINczFK0EMO69 Ieuv4n9Cp4DX2zvCD2xg==; 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 1hQ3CJ-0008Cr-Fc; Mon, 13 May 2019 05:08:23 +0000 Received: from hqemgate14.nvidia.com ([216.228.121.143]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hQ3Bn-0007ZE-Pm for linux-arm-kernel@lists.infradead.org; Mon, 13 May 2019 05:08:01 +0000 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Sun, 12 May 2019 22:07:58 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Sun, 12 May 2019 22:07:51 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Sun, 12 May 2019 22:07:51 -0700 Received: from HQMAIL106.nvidia.com (172.18.146.12) by HQMAIL104.nvidia.com (172.18.146.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 13 May 2019 05:07:50 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL106.nvidia.com (172.18.146.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 13 May 2019 05:07:50 +0000 Received: from vidyas-desktop.nvidia.com (Not Verified[10.24.37.38]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Sun, 12 May 2019 22:07:50 -0700 From: Vidya Sagar To: , , , , , , , , , , Subject: [PATCH V6 08/15] dt-bindings: Add PCIe supports-clkreq property Date: Mon, 13 May 2019 10:36:19 +0530 Message-ID: <20190513050626.14991-9-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190513050626.14991-1-vidyas@nvidia.com> References: <20190513050626.14991-1-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=1557724078; bh=quJi6Y4ESYCGf49vvtc98WM7Jk12MWOFg3Y4D3CvuoE=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=IiEkkYB0YnFPcrIYORShxsnCWlx7QnxmDbIT2s0KZoM4Rnq7/NHcB5+m6MmsrLnPD QtauIxl1rYJVQUOecbFNeCgzgWKBwTIOVXWOZkiGYg+hb1ml/4ea1VCgEuiOqIENae BP0CdVIBSI5TrXD9lpyiT1LIUfpOXi+DQqkYx6U8E/glkihK7NThanW27ghPTv3cLn HZC8X8Kw8+fWDgjFQ1u3pK8NMXa9ZlzAXW0WUCCVtdSXgw3Kb5oCtw5bYLEifQsvzr C8wWP2X4t+HBnIgat1v1v4xYf8zCfJPvX/Z8bCkfH4EqJAJXhEln8U04VZ5GPtTgz6 X3xaFTA44bRlg== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190512_220752_147459_56B3B625 X-CRM114-Status: UNSURE ( 8.27 ) 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 Reviewed-by: Rob Herring --- 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 -------------------------