From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 344CDC74A21 for ; Wed, 10 Jul 2019 15:29:13 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 0648720844 for ; Wed, 10 Jul 2019 15:29:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="JNDB7vt7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0648720844 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=7uIBVW6WosJlKFMrtZLj4h7QRKUu8jZh98yRUnvmuB0=; b=JNDB7vt7/V26aO eyjTyWnKznbRwThG69E5AkRHlHu4DJGKOmABeiE4S7YBMKWUDK/PMxyWGlRvz4w8nR3IlIpoc9wBq NrSaS6pca0ILVSc5pLL83G3VaQj7VHmEXG37cZhrn5+s/veOi6jJ0sVDZi/K0t0hXk7/ILEdbx/Lh Xcg3ZRmwjpboNkLDo7KTbjlE0CmsQHNWM2I6yLsLyEj2DV2gf4BuWraLVehBNV/uHwPxVO7TpEkfd HeWNbWDRNT9zMBau8Zp+t4+gxcF6RNPj17ZlLEAlM6FNTMdxmY5rw31/NRR5KprrDcUMq7SHrRfm6 KOO584EBh3oBPrl4Hb0g==; 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 1hlEWo-0004Wu-Qy; Wed, 10 Jul 2019 15:29:06 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hlEWk-0004Ui-TN for linux-arm-kernel@lists.infradead.org; Wed, 10 Jul 2019 15:29:04 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 49FD82B; Wed, 10 Jul 2019 08:29:01 -0700 (PDT) Received: from e121166-lin.cambridge.arm.com (unknown [10.1.196.255]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AEC113F246; Wed, 10 Jul 2019 08:28:58 -0700 (PDT) Date: Wed, 10 Jul 2019 16:28:56 +0100 From: Lorenzo Pieralisi To: Vidya Sagar Subject: Re: [PATCH V13 08/12] dt-bindings: Add PCIe supports-clkreq property Message-ID: <20190710152856.GB8781@e121166-lin.cambridge.arm.com> References: <20190710062212.1745-1-vidyas@nvidia.com> <20190710062212.1745-9-vidyas@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190710062212.1745-9-vidyas@nvidia.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190710_082902_997359_16CA1747 X-CRM114-Status: GOOD ( 17.57 ) 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: mark.rutland@arm.com, devicetree@vger.kernel.org, mperttunen@nvidia.com, mmaddireddy@nvidia.com, linux-pci@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, kthota@nvidia.com, kishon@ti.com, linux-tegra@vger.kernel.org, robh+dt@kernel.org, thierry.reding@gmail.com, gustavo.pimentel@synopsys.com, jingoohan1@gmail.com, bhelgaas@google.com, digetx@gmail.com, jonathanh@nvidia.com, linux-arm-kernel@lists.infradead.org, sagar.tv@gmail.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Jul 10, 2019 at 11:52:08AM +0530, Vidya Sagar wrote: > 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 You mean "being disconnected from the bus" right ? I will update it. Lorenzo > 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 > --- > V13: > * None > > V12: > * Rebased on top of linux-next top of the tree > > V11: > * None > > V10: > * None > > V9: > * None > > V8: > * None > > V7: > * None > > V6: > * s/Documentation\/devicetree/dt-bindings/ in the subject > > V5: > * None > > V4: > * Rebased on top of linux-next top of the tree > > V3: > * None > > V2: > * 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 2a5d91024059..29bcbd88f457 100644 > --- a/Documentation/devicetree/bindings/pci/pci.txt > +++ b/Documentation/devicetree/bindings/pci/pci.txt > @@ -27,6 +27,11 @@ driver implementation may support the following properties: > - reset-gpios: > If present this property specifies PERST# GPIO. Host drivers can parse the > GPIO and apply fundamental reset to endpoints. > +- 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 > ------------------------- > -- > 2.17.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel