From patchwork Thu Aug 31 04:50:27 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oza Pawandeep X-Patchwork-Id: 9931191 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 4635A602F0 for ; Thu, 31 Aug 2017 04:51:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 35C6F28725 for ; Thu, 31 Aug 2017 04:51:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2ACF128829; Thu, 31 Aug 2017 04:51:47 +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=-6.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_HI,RCVD_IN_SORBS_SPAM autolearn=unavailable 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 D58CB28725 for ; Thu, 31 Aug 2017 04:51:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751205AbdHaEvC (ORCPT ); Thu, 31 Aug 2017 00:51:02 -0400 Received: from mail-qt0-f175.google.com ([209.85.216.175]:38169 "EHLO mail-qt0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751053AbdHaEu7 (ORCPT ); Thu, 31 Aug 2017 00:50:59 -0400 Received: by mail-qt0-f175.google.com with SMTP id w42so35433248qtg.5 for ; Wed, 30 Aug 2017 21:50:59 -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=e7K0WzPqUIqxjaeIuS7r4G03i+bxXMjmW6jiEeJoQns=; b=PWPAJ0u7116cPCoWe8GdyOVFAX8oicYZ/v5OC45O50VoWNqw3qKXsyNiNy1MlnXw+F zSGU7rHnTXhEZTFR76has8CqV8Y7e7rZp0Z6sFHd2FevKUKXEikzf2Y27ASF1p1H6apZ 5m1nsEINWtTzVm592M+kAooU0iH7RBlb5euZI= 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=e7K0WzPqUIqxjaeIuS7r4G03i+bxXMjmW6jiEeJoQns=; b=tasJ+tPaNEKcoC4Q1KRCLFaJdBQyn3uW1FnpURoHh4HYn/Vs1VyraULDdSs713nvP5 5QdrFoD6tRb8HVbNrq5/wxGY82ZbZn/U2kfoWuFZi3Ta032k/m0cbarD5y77sRM1vQML QpHwbesOHFQxty8VuDKv6xfT6979OeMjjNfDi9QUL1OGHa17vW6OihNsQGgIBX7nW6HN 5E3TRPQ0pimQ1t36Ah3XJxhSkl7i4/gSbSAhNv7GedRLS/h3G6hbwwDM0G17IpRyBoBM 0UupzUm7dvo0xPbwqac7preMEOjwBrsP7X4MfMBWQKNBwRP7ouTDeD3oehFePt7zi/Ff duow== X-Gm-Message-State: AHYfb5h/nLaw3euVe4dQ5h1CvckpGFkTBPNoDbGqpOX/ivknQsDee26f iyLPfDSh+HKXR0aC X-Received: by 10.237.59.92 with SMTP id q28mr5153144qte.246.1504155058375; Wed, 30 Aug 2017 21:50:58 -0700 (PDT) Received: from anjanavk-OptiPlex-7010.dhcp.avagotech.net ([192.19.237.250]) by smtp.gmail.com with ESMTPSA id q2sm4857729qti.45.2017.08.30.21.50.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 30 Aug 2017 21:50:57 -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 v6 1/3] dt-bindings: PCI: Add PCI hotplug property Date: Thu, 31 Aug 2017 10:20:27 +0530 Message-Id: <1504155029-24729-2-git-send-email-oza.oza@broadcom.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1504155029-24729-1-git-send-email-oza.oza@broadcom.com> References: <1504155029-24729-1-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 it. 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 Acked-by: Rob Herring 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.