From patchwork Wed Jun 12 09:53:32 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 10989305 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 92EBA14E5 for ; Wed, 12 Jun 2019 09:57:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7F5E628A22 for ; Wed, 12 Jun 2019 09:57:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 73A5A28A26; Wed, 12 Jun 2019 09:57:01 +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 122F828A22 for ; Wed, 12 Jun 2019 09:57:01 +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=Lhgz3Cv513iGuAAeALvRTI15Dh+WGW8MciqzWOLT2nc=; b=p+7VLj/w1ygmaa auqso37w0s0xl/jMOJGAOlVFnt5kTco6GB0z4JhQFY/h/IqOLUF7Dw8adJDXmioBoc/PAjr5IGX3T L2mLdsk6aW+Za9FgiWjP6X4mCaAjOLJNmekJ+S0Zc04BcpjYEM6I7vdEl5pzvhuzRwc8wufD0xhqK wFaiZef+hSMc8QsehLpxSbf2lfvgzEnSYQKJioSVWMLc9AmVvt7kYmzl3OLOdOPXufhQSzJ01PedA 6DmZO/nIgCPgE+/5IOsbqxJTcLW4K74+1N3pv6MfSBOODSPPROQKQ7Lw15MD/IZeRXjQPGxPiHNWu 96gFPv7tv15DLoW8XfAA==; 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 1hazzx-0007Bo-6E; Wed, 12 Jun 2019 09:56:53 +0000 Received: from hqemgate16.nvidia.com ([216.228.121.65]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hazyE-0004OM-SE for linux-arm-kernel@lists.infradead.org; Wed, 12 Jun 2019 09:55:09 +0000 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 12 Jun 2019 02:55:04 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Wed, 12 Jun 2019 02:55:04 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Wed, 12 Jun 2019 02:55:04 -0700 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 12 Jun 2019 09:55:03 +0000 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 12 Jun 2019 09:55:03 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 12 Jun 2019 09:55:03 +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 ; Wed, 12 Jun 2019 02:55:03 -0700 From: Vidya Sagar To: , , , , , , , , , , Subject: [PATCH V10 08/15] dt-bindings: Add PCIe supports-clkreq property Date: Wed, 12 Jun 2019 15:23:32 +0530 Message-ID: <20190612095339.20118-9-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190612095339.20118-1-vidyas@nvidia.com> References: <20190612095339.20118-1-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=1560333304; bh=L/lFihiSEvCPhrdoRfhpfDJHrBMZvhI8I+hkWbTCIo0=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=FHGlsRp+OOi8eK1gcDDqXegmRVKSE0RlqhYTWyOCmpJ7B18NDdmcyEYE/kztnVxg1 fYuzDlIzLPsNWanssl2ISlBJUNdziGFBcTTpWBUEcoZeA0oVHbtbN3hoTPvCn/1vm/ y1EqVKyxg1NMMEnUTgyiTkHjBr7Gpgfp5FPRlrh4QCG4/yvx4MjP3JDPkaWOuzTHq5 3dB06J0VagOHs9s7mHolLuk5JJDfto8mRrLGriGR0/1JAFEFr9kWqo48/jRwv1ZHk3 O/9iRWsY+PKJ4eBDcQXfWJ03/gojElTga+JxqKxakjapDvLwIzabBvfUgEED12VTcj KmSCXhi1BGikw== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190612_025507_433725_8F987F6D X-CRM114-Status: UNSURE ( 8.35 ) 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 [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 -------------------------