From patchwork Fri Mar 29 15:10:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Patrick Leis X-Patchwork-Id: 10877233 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 828931708 for ; Fri, 29 Mar 2019 15:10:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6625629852 for ; Fri, 29 Mar 2019 15:10:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5A27A292A3; Fri, 29 Mar 2019 15:10:40 +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=-5.2 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CE593292A3 for ; Fri, 29 Mar 2019 15:10:39 +0000 (UTC) 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:To:From:Subject:Mime-Version:Message-Id :Date:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=9NC+hhWm3O5SAd8EOQoWnGqXG8aRdPOqpakp/4zju5o=; b=ImkQgYbWLmXpMm Szs6/SGZ18RYScFB0VLdoF8jpfW/fCiyHRYMUk5J3JsOgdpNZ8X/Ogbren/v2I3294/2HeVAUJmzm CTBXsrzNVlwEj1J/dhMI88tECYgPaZ7Ak56wrakP3FS8tmoykUbpUaWadST9+d8vqmuIKZXlcOiD6 /I/RP1V8/KpftBmraCQfoCoKWWoFlIH5W8TQ2t40oeeg98DCwL1n11/qAeCwmlzYfTMQwbmevbCL/ 8qUVv4cMfVjics8MKJl92BDPQY4e9P7Z545xftyFAU7nH93k4KzH5rhc1Ri1pS0UUvFhKDCEaFDqh qOFrFCLUMkth4YD/bqzQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h9t9N-00039l-Hv; Fri, 29 Mar 2019 15:10:33 +0000 Received: from mail-pf1-x449.google.com ([2607:f8b0:4864:20::449]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1h9t9K-000397-3g for linux-arm-kernel@lists.infradead.org; Fri, 29 Mar 2019 15:10:31 +0000 Received: by mail-pf1-x449.google.com with SMTP id b12so1685282pfj.5 for ; Fri, 29 Mar 2019 08:10:29 -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=m5+J7r1VBfrdcP6uJuO95LQiwCpHc/yHDQw72h3urf8=; b=oW0tE8g7ZZYFlvGBzbeDQ35ncg7nPur8tnhSblujfZrrjXj+k+T4Po0LE9LQgtVKLw n7yCMvCuf9IrJ39nPEKxH9TW5HiGNRMPxiBQ86iLa8Zp/fy/k1Zip7S3cahBB3z9kfUo mioZoWhsgoCARoMbHAIKwzUM/G0EUPOVIEsbeoVI5kqrUVx3d4QqrkFP0ZFNjCF0Ij3s A9s67r6jDTHOQkfq+D8DGwTUzzVzo3EkDYBTRBF7X7YJ1i3HCJpKlE67H//LIlHgQHEP FTBbJw3ZCN8RwwJtTFmvVX9GPY9IN+hw7S6DKRVFndIgwP0dqJrveDyYiNxoI34aKwmB pL+Q== 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=m5+J7r1VBfrdcP6uJuO95LQiwCpHc/yHDQw72h3urf8=; b=ZQq+xMTlPSbNq0ziAWSZ3uyxy+Ag4nKXsOdK45cjgqyqcXTKuwi1zLatOjF/kQ2O7x +TQUh4OmKlg7ilncmSho862fiLu7h7mFRq/NmaWaKeMPngtpQF1dXV2dlFKQLeEwBS3y ULBXooFlcOXxlfo/FmbVjzL8ExgBbVg0CI31lJODs4CgoJObbKcpExlPcr9mICRzHsZE 9cMPNOTmKiXAsKepKqPcNCUnA9G3+P7fdtycCJtGgh8rYCB0wvfYirw1Pf1xTUYxFDML qvMxINEnjWhH7lViBnPlA9gG5qRrubSiRHypDH1Sym3jK5DeOdpNvUkKr7K/GOjhra19 dCjg== X-Gm-Message-State: APjAAAVnmVm9Sv3EfzSHRy/QKIAievz6+zbmiJyaayZxIfS0rQ7l+snr PY83qNRrj687iz8t5qC/XQDxi3mDMNcr X-Google-Smtp-Source: APXvYqwiZwvBOltMs9I4OhU7gcFMnGzl9uDBH1IxTQX4GOsMahpF57ZywVce/nkTSX8Iwjlwplg1kADKR5vt X-Received: by 2002:a62:d241:: with SMTP id c62mr560123pfg.110.1553872228903; Fri, 29 Mar 2019 08:10:28 -0700 (PDT) Date: Fri, 29 Mar 2019 08:10:25 -0700 Message-Id: <20190329151025.204094-1-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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190329_081030_180621_5B2DDB86 X-CRM114-Status: GOOD ( 12.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , devicetree@vger.kernel.org, linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Document the ast2400, ast2500 PCI-to-AHB bridge control driver bindings. Signed-off-by: Patrick Venture Reviewed-by: Rob Herring --- 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>; + }; +};