From patchwork Tue Apr 3 13:29:15 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 10321095 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 DAFE360116 for ; Tue, 3 Apr 2018 13:32:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CAE8B2884C for ; Tue, 3 Apr 2018 13:32:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BF5C5288AE; Tue, 3 Apr 2018 13:32:15 +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=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID 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 3730B2884C for ; Tue, 3 Apr 2018 13:32:15 +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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=1liQugU3g2IuhL7OHILPa0Bgt73GxsWa5W58dHceR1s=; b=IHjX5ykoQPZAiZdkncG0nWsq1D tauseTjI4O4EQw5/Z+vMrRH3E6SAH/IM9TbjkLhNMwAWKRGUuIC5l52f1XT6iH7yIqGBf984Ys3wu /wHXLvwi40pKhGUz8UxmB0h46657TKLWBtz51kxHcvrOiE5EE9mbNRhZAnz1Pn9OBIacSJ7ns8gX+ X4zx6bhvALScSGVay7C7uF+ZnqPMTISnJFE5ORf5PHEpX8QhSfa9sh6+14jBISV5AKF6gwBuedp1N D0I9bKyW4vmpv55zsBVQ8yu6k/j9ki2btqOdwdPVc1cq6j0CtlXzRHtRygO9tzmc16lUjDNLDnIPp IXzR76sQ==; 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 1f3M2d-0001o3-Bn; Tue, 03 Apr 2018 13:32:03 +0000 Received: from mail.bootlin.com ([62.4.15.54]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1f3M0b-0007Mv-CF for linux-arm-kernel@lists.infradead.org; Tue, 03 Apr 2018 13:30:00 +0000 Received: by mail.bootlin.com (Postfix, from userid 110) id 18C9F208BA; Tue, 3 Apr 2018 15:29:56 +0200 (CEST) Received: from localhost (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.bootlin.com (Postfix) with ESMTPSA id 5B4F32087E; Tue, 3 Apr 2018 15:29:23 +0200 (CEST) From: Maxime Ripard To: Mark Rutland , Rob Herring , Frank Rowand , Chen-Yu Tsai , Maxime Ripard Subject: [PATCH 2/7] dt-bindings: bus: Add binding for the Allwinner MBUS controller Date: Tue, 3 Apr 2018 15:29:15 +0200 Message-Id: <43cb5a132a36492da2ceef801c97f6cb0aad2a25.1522761929.git-series.maxime.ripard@bootlin.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: References: In-Reply-To: References: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180403_062957_592538_98823789 X-CRM114-Status: GOOD ( 14.42 ) 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: devicetree@vger.kernel.org, Thomas Petazzoni , Arnd Bergmann , dri-devel@lists.freedesktop.org, Paul Kocialkowski , Yong Deng , Robin Murphy , Dave Martin , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 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 The MBUS controller drives the MBUS that other devices in the SoC will use to perform DMA. It also has a register interface that allows to monitor and control the bandwidth and priorities for masters on that bus. Signed-off-by: Maxime Ripard --- Documentation/devicetree/bindings/sunxi-mbus.txt | 35 +++++++++++++++++- 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/sunxi-mbus.txt diff --git a/Documentation/devicetree/bindings/sunxi-mbus.txt b/Documentation/devicetree/bindings/sunxi-mbus.txt new file mode 100644 index 000000000000..436df0cac9d0 --- /dev/null +++ b/Documentation/devicetree/bindings/sunxi-mbus.txt @@ -0,0 +1,35 @@ +Allwinner Memory Bus (MBUS) controller + +The MBUS controller drives the MBUS that other devices in the SoC will +use to perform DMA. It also has a register interface that allows to +monitor and control the bandwidth and priorities for masters on that +bus. + +Required properties: + - compatible: Must be one of: + - allwinner,sun5i-a13-mbus + - reg: Offset and length of the register set for the controller + - clocks: phandle to the clock driving the controller + - dma-ranges: see booting-without-of.txt + - #dma-parent-cells: Must be one, with the argument being the MBUS port + ID + +Each device having to perform their DMA through the MBUS must have the +dma-parent property set to the MBUS controller, as documented in +booting-without-of.txt. + +Example: + +mbus: dram-controller@1c01000 { + compatible = "allwinner,sun5i-a13-mbus"; + reg = <0x01c01000 0x1000>; + clocks = <&ccu CLK_MBUS>; + dma-ranges = <0x00000000 0x40000000 0x20000000>; + #dma-parent-cells = <1>; +}; + +fe0: display-frontend@1e00000 { + compatible = "allwinner,sun5i-a13-display-frontend"; + ... + dma-parent = <&mbus 19>; +};