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=DKIMWL_WL_MED,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 AEB70C10F13 for ; Mon, 8 Apr 2019 14:42:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7E2CD20879 for ; Mon, 8 Apr 2019 14:42:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="YUh7F2Ww" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727346AbfDHOm0 (ORCPT ); Mon, 8 Apr 2019 10:42:26 -0400 Received: from mail-qt1-f201.google.com ([209.85.160.201]:33809 "EHLO mail-qt1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726005AbfDHOmZ (ORCPT ); Mon, 8 Apr 2019 10:42:25 -0400 Received: by mail-qt1-f201.google.com with SMTP id x58so12903073qtc.1 for ; Mon, 08 Apr 2019 07:42:24 -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=b5YLUBhVLY7mkfopkFQjIkzP3Gwv/ZY13l4EfD4a/cA=; b=YUh7F2WwUojHZWZhi2LqD0Ket0y9zsQII1TAC8SrJXeJ80x5k54IoXJIKfmWCcrC2j isKlloJdyyFi/HQUlZ1hAd61zifYgV2moItCWqQ25ckbjXDI69lMyVDrZYk5gvn+VH+W +67Vxa5J7AwqtNZ1Dapfl7qQiRmBY3kU+78w6F9t9s0S9iLOUKf37N5kHTOb3V1w+WEf Of1kzmvpSFg7EF22k22BcV0VuCRqN2IUzN4RrAKIcAAkvBIZzz6EGa4lY5ZFxcxOx3un 2uz+Q5nrz6cSGfEfsEaojXCynAesG4Wvrt1l4HC6PBhhpfTkPDI10dYyppTWGBnEK5mj E4yQ== 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=b5YLUBhVLY7mkfopkFQjIkzP3Gwv/ZY13l4EfD4a/cA=; b=kcZMww+Md35rcv7o+qhcDvJg9ykDs6Yq9LOFp3kGn+PbRz10+6ScGwMaf0KEsTWbGm xAflqYbTYbPJVk0GL1tP3VYwg5CJz98qSbv5ZaYwzfIzfk/BtCf2YhUUSF5OLZ2TNkYj PMf8x+2f264oPKLV6GvXuVaa0AiAk5imppwmj04KioELdv8IwguMGa07cwNYlefbmCKE fOcp295V79ibIytAa+yqXhxPENJJZylIIFg3ZykzQByzZNUUqzLov9e9hpnqFE7lM5L+ KwX5lu9xstC3DJcO9pzg9sHVhV6OQe9oAJTv30dzs4ynfQ+EHBrsZQukLsb0lF+uxLEK g04Q== X-Gm-Message-State: APjAAAWYfN2vs9GNwXFwoNCzJMnBNKOa76kAbDYoDt9/rEMYXwMKVxxj bXlZMKVkb9GNTo6DFDnMflR6LqHQH0tA X-Google-Smtp-Source: APXvYqx8DIwao7Qeicx77irHcsITaRHETyMc24ZgVrUbqrPzxKZF5aW+yMwNH21N6DXctR0ATjDV0ngcwmzI X-Received: by 2002:ac8:93d:: with SMTP id t58mr3643003qth.41.1554734544323; Mon, 08 Apr 2019 07:42:24 -0700 (PDT) Date: Mon, 8 Apr 2019 07:42:16 -0700 Message-Id: <20190408144216.160082-1-venture@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH v10 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, Rob Herring 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 Reviewed-by: Rob Herring --- Changes for v10: - Chopped out nearly identical information. Changes for v9: - Added missing details about syscon parent 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 | 47 +++++++++++++++++++ 1 file changed, 47 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..854bd67ffec68 --- /dev/null +++ b/Documentation/devicetree/bindings/misc/aspeed-p2a-ctrl.txt @@ -0,0 +1,47 @@ +====================================================================== +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" + +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