From patchwork Thu Aug 24 08:49:07 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 9919551 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A4D2C60353 for ; Thu, 24 Aug 2017 08:49:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9668428B6C for ; Thu, 24 Aug 2017 08:49:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8B25428B7A; Thu, 24 Aug 2017 08:49:34 +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=-7.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7C89328B6C for ; Thu, 24 Aug 2017 08:49:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751839AbdHXItb (ORCPT ); Thu, 24 Aug 2017 04:49:31 -0400 Received: from mail-wr0-f173.google.com ([209.85.128.173]:35580 "EHLO mail-wr0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751792AbdHXIt2 (ORCPT ); Thu, 24 Aug 2017 04:49:28 -0400 Received: by mail-wr0-f173.google.com with SMTP id k46so7864984wre.2 for ; Thu, 24 Aug 2017 01:49:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:subject:date:message-id:in-reply-to:references; bh=SU5Pny4anM5GXy0MkkVGrsCAjcDPfh7zClvvGnEU5+k=; b=iAVOY+LsDXB8Bx8Eb3uQTTNGmdrl1nbi3eoGQR8hQgZs9hJyPJnK2Q0Fp1FjuP9etn iOkbAWuOnWIS8T9mVcybc3LHGUXRdC/dr1jCwpvtVlwMnuk4FwUKkxQ0hmncvjm636Yi lR5ghfAacZrPBLjb6/TN1jJetKQxlTTw9KyEM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references; bh=SU5Pny4anM5GXy0MkkVGrsCAjcDPfh7zClvvGnEU5+k=; b=uTz3PS61oavHXRaDekOthal0rg2+l8Jx0EknKTipL/F3OL/Y8y5SuCMKzYU4uI12G3 Xp6QorHKBCa3zIO6Pkhpiriv+KHWmL7MJKwB3x0TkrNzwV44iAQKqPiq9GeBJSYBaM9r KW6VlC2F5wFwJcweYDDjtY2Zgi0fzo5G9anQeNWFAPRWAhi+ppyCmOKi6om6E5RRYjOV Qqdf54oQRrphuuPhpzKsP/4EmnNkqB2Evp/aJUAQFfhpb3qVYrPtWOwJo7Mwf5isFuW7 /6fVVWoAHlffn7CG/vCTVivthbDiLCmLU/Idbom3Ug44VPed2utS5Ofr13Og37lAPJt6 G6/A== X-Gm-Message-State: AHYfb5hf7fCRslQIkq1rEnjyr5eUPZAV03PH244tvUWSoj3/WgVRsyg6 J79JwWiBVpUSzaKY X-Received: by 10.223.177.156 with SMTP id q28mr3092186wra.290.1503564566746; Thu, 24 Aug 2017 01:49:26 -0700 (PDT) Received: from anjanavk-OptiPlex-7010.dhcp.avagotech.net ([192.19.237.250]) by smtp.gmail.com with ESMTPSA id g133sm6592832wmd.48.2017.08.24.01.49.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 24 Aug 2017 01:49:25 -0700 (PDT) From: Oza Pawandeep To: Bjorn Helgaas , , Rob Herring , Mark Rutland , Ray Jui , Scott Branden , Jon Mason , bcm-kernel-feedback-list@broadcom.com, Oza Pawandeep , Andy Gospodarek , linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Oza Pawandeep Subject: [PATCH v4 2/3] dt-bindings: PCI: add PCIe hotplug property Date: Thu, 24 Aug 2017 14:19:07 +0530 Message-Id: <1503564548-1834-3-git-send-email-oza.oza@broadcom.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1503564548-1834-1-git-send-email-oza.oza@broadcom.com> References: <1503564548-1834-1-git-send-email-oza.oza@broadcom.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Host drivers have the requirement of implementing PCI hotplug based on the how their SOC supports PCI hotplug. Couple of properties have been added. the one to enable the hotplug feature itself, and the other caters to the PCI hotplug implementation with the use of gpios. Signed-off-by: Oza Pawandeep diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt index 50f9e2c..0bf25a1 100644 --- a/Documentation/devicetree/bindings/pci/pci.txt +++ b/Documentation/devicetree/bindings/pci/pci.txt @@ -24,3 +24,18 @@ 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. + +- slot-pluggable: + PCI hotplug feature is supported. + PCI hotplug implementation is SOC/Board specific, and also it depends on + how add-in card is designed (e.g. how many present pins are implemented). + If the slot-pluggable property is present, the following propertey could + become effective. + - prsnt-gpios: + Array of gpios, could be present if hotplug is supported. + This property defines gpio based hotplug implementation. + Example: + If x8 card is connected, then it might be possible that all the + 3 present pins could go low, or at least one pin goes low. + If x4 card is connected, then it might be possible that 2 present + pins go low, or at least one pin goes low.