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=-16.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham 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 05684C43381 for ; Wed, 27 Mar 2019 21:22:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B6B722082F for ; Wed, 27 Mar 2019 21:22:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="vcfPZFjZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727961AbfC0VWF (ORCPT ); Wed, 27 Mar 2019 17:22:05 -0400 Received: from mail-qt1-f201.google.com ([209.85.160.201]:47457 "EHLO mail-qt1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726891AbfC0VWF (ORCPT ); Wed, 27 Mar 2019 17:22:05 -0400 Received: by mail-qt1-f201.google.com with SMTP id z34so18274113qtz.14 for ; Wed, 27 Mar 2019 14:22:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=48scp4XmiicMd1uJB9R9oC5WIEZgJYNMZkP6/YkFhCc=; b=vcfPZFjZYFgyT9FnqPuRx0mXPB372rFJGA1lsKfHxFUdltAuMAUoeXHoUoNCbz/dGp 8in/2ytey66tmgfoYCKIFmQD92zZ9uaJvpMd3QDPS9J2AkHOow3Ukps8UkRDXKmFIJQg 6XAqSwnnhCWNOCxGZVTOAf2tjLAsqlI8XRNo0h/pq639FNgc/1+BFa0ZWfeiiDdPnR9c JvKskW6woW+0e8ffLXqR5K3mN0Te4Fr3k6kC/cAcOIR/nGjE/TXlkoluMuBOyIOlIj1O U6dj8mqqdY/XhS/uEnKJqUtyl2PNGqxjblojVvuB3ZNiKwky00P/nx8uE4wHeH4tj2m0 xaTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=48scp4XmiicMd1uJB9R9oC5WIEZgJYNMZkP6/YkFhCc=; b=Bsc6yajmjdNOTAZtfayDGkKcIQ/FeOwyc6yTPvnNOcFsSQ9hbSCRhXqFgv1uWhLvkG apq+pnOsQ5I18Tn2GoRQlg+WOEJHD0gR7JQJnPqMkpMfepG6mYBfl0hRh0sSBrpbvDXH qTrfWQaeF7WMHMLjcjSRxfQm8nbmf9bJF2ZWwoavciItoMKENA5E7jOaiCPtz+IsdLi7 27cO46IJwJhOE//roLAW0cB6b46QuueN2aayrJMZLT42oClAcWnOUMorxVfwUFvzKDOf sTZsFNjcVZlJCX9CrUrIK6QDAdqPRgwrnjUqjGrd1Nq18+1jsr0BtAY6WX/rLkTs2sQe SXVQ== X-Gm-Message-State: APjAAAUaWXGaeBbniwj8hB1fDanb0OOIdcyY7zLZ7AXnBsv7hyJm4xCZ 8pYZqr6nLtb960LuAL2K8nYkPoDoKHqK X-Google-Smtp-Source: APXvYqwu0UXYWUO2Au194kl9CxcUr6cu8AT+tKYOIEQUMOHJprFLKJq9sEDQmpHMlwoJ3w1etKSm7myJKCHi X-Received: by 2002:aed:3e16:: with SMTP id l22mr1962071qtf.50.1553721724234; Wed, 27 Mar 2019 14:22:04 -0700 (PDT) Date: Wed, 27 Mar 2019 14:21:55 -0700 Message-Id: <20190327212155.80730-1-venture@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH v8 1/2] dt-bindings: misc: aspeed-p2a-ctrl: add support From: Patrick Venture To: venture@google.com, robh+dt@kernel.org, mark.rutland@arm.com, joel@jms.id.au, andrew@aj.id.au, gregkh@linuxfoundation.org Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Document the ast2400, ast2500 PCI-to-AHB bridge control driver bindings. Signed-off-by: Patrick Venture --- Changes for v8: - None Changes for v7: - Moved node under the syscon node it requires Changes for v6: - None Changes for v5: - None Changes for v4: - None Changes for v3: - None Changes for v2: - Added comment about syscon required parameter. --- .../bindings/misc/aspeed-p2a-ctrl.txt | 48 +++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt diff --git a/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt new file mode 100644 index 0000000000000..088cc4e3dc54b --- /dev/null +++ b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt @@ -0,0 +1,48 @@ +====================================================================== +Device tree bindings for Aspeed AST2400/AST2500 PCI-to-AHB Bridge Control Driver +====================================================================== + +The bridge is available on platforms with the VGA enabled on the Aspeed device. +In this case, the host has access to a 64KiB window into all of the BMC's +memory. The BMC can disable this bridge. If the bridge is enabled, the host +has read access to all the regions of memory, however the host only has read +and write access depending on a register controlled by the BMC. + +Required properties: +=================== + + - compatible: must be one of: + - "aspeed,ast2400-p2a-ctrl" + - "aspeed,ast2500-p2a-ctrl" + + - syscon: handle to syscon device node controlling PCI. + +Optional properties: +=================== + +- memory-region: A phandle to a reserved_memory region to be used for the PCI + to AHB mapping + +The p2a-control node should be the child of a syscon node with the required +property: + +- compatible : Should be one of the following: + "aspeed,ast2400-scu", "syscon", "simple-mfd" + "aspeed,g4-scu", "syscon", "simple-mfd" + "aspeed,ast2500-scu", "syscon", "simple-mfd" + "aspeed,g5-scu", "syscon", "simple-mfd" + +Example: + +g4 Example +---------- + +syscon: scu@1e6e2000 { + compatible = "aspeed,ast2400-scu", "syscon", "simple-mfd"; + reg = <0x1e6e2000 0x1a8>; + + p2a: p2a-control { + compatible = "aspeed,ast2400-p2a-ctrl"; + memory-region = <&reserved_memory>; + }; +}; -- 2.21.0.392.gf8f6787159e-goog