From patchwork Tue Sep 10 11:50:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Ujfalusi X-Patchwork-Id: 11139271 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6003476 for ; Tue, 10 Sep 2019 11:50:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3460821D6C for ; Tue, 10 Sep 2019 11:50:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="BlbforvP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731623AbfIJLuN (ORCPT ); Tue, 10 Sep 2019 07:50:13 -0400 Received: from fllv0015.ext.ti.com ([198.47.19.141]:33200 "EHLO fllv0015.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727120AbfIJLuN (ORCPT ); Tue, 10 Sep 2019 07:50:13 -0400 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by fllv0015.ext.ti.com (8.15.2/8.15.2) with ESMTP id x8ABoBuR040806; Tue, 10 Sep 2019 06:50:11 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1568116211; bh=EqKT5FCpYXzCmOXY0n2mABkUfFslwNpZ85dM04a5nHc=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=BlbforvP0LGbgN1TGnofPmcmASn2nZxobkNRBxTrWaJT7EyblYsVD0U8awgUtRLsK kAz0/gSPjmZU9msAqrctAIxBxn2BTdVggkaGjp5D9Rd8InRohByZrJeU7JiD3m9zDi wk+nDPhJSm+0oZeiVDNxR4lu0dD/YmJAj+lOpCvw= Received: from DLEE104.ent.ti.com (dlee104.ent.ti.com [157.170.170.34]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id x8ABoBvr010377 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 10 Sep 2019 06:50:11 -0500 Received: from DLEE103.ent.ti.com (157.170.170.33) by DLEE104.ent.ti.com (157.170.170.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5; Tue, 10 Sep 2019 06:50:10 -0500 Received: from lelv0327.itg.ti.com (10.180.67.183) by DLEE103.ent.ti.com (157.170.170.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1713.5 via Frontend Transport; Tue, 10 Sep 2019 06:50:09 -0500 Received: from feketebors.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0327.itg.ti.com (8.15.2/8.15.2) with ESMTP id x8ABo5cG028909; Tue, 10 Sep 2019 06:50:08 -0500 From: Peter Ujfalusi To: , CC: , , , Subject: [PATCH 1/3] dt-bindings: dma: Add documentation for DMA domains Date: Tue, 10 Sep 2019 14:50:35 +0300 Message-ID: <20190910115037.23539-2-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190910115037.23539-1-peter.ujfalusi@ti.com> References: <20190910115037.23539-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org On systems where multiple DMA controllers available, non Slave (for example memcpy operation) users can not be described in DT as there is no device involved from the DMA controller's point of view, DMA binding is not usable. However in these systems still a peripheral might need to be serviced by or it is better to serviced by specific DMA controller. When a memcpy is used to/from a memory mapped region for example a DMA in the same domain can perform better. For generic software modules doing mem 2 mem operations it also matter that they will get a channel from a controller which is faster in DDR to DDR mode rather then from the first controller happen to be loaded. This property is inherited, so it may be specified in a device node or in any of its parent nodes. Signed-off-by: Peter Ujfalusi --- .../devicetree/bindings/dma/dma-domain.yaml | 88 +++++++++++++++++++ 1 file changed, 88 insertions(+) create mode 100644 Documentation/devicetree/bindings/dma/dma-domain.yaml diff --git a/Documentation/devicetree/bindings/dma/dma-domain.yaml b/Documentation/devicetree/bindings/dma/dma-domain.yaml new file mode 100644 index 000000000000..da59bb129c58 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/dma-domain.yaml @@ -0,0 +1,88 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/dma/dma-controller.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: DMA Domain Controller Definition + +maintainers: + - Vinod Koul + +allOf: + - $ref: "dma-controller.yaml#" + +description: + On systems where multiple DMA controllers available, none Slave (for example + memcpy operation) users can not be described in DT as there is no device + involved from the DMA controller's point of view, DMA binding is not usable. + However in these systems still a peripheral might need to be serviced by or + it is better to serviced by specific DMA controller. + When a memcpy is used to/from a memory mapped region for example a DMA in the + same domain can perform better. + For generic software modules doing mem 2 mem operations it also matter that + they will get a channel from a controller which is faster in DDR to DDR mode + rather then from the first controller happen to be loaded. + + This property is inherited, so it may be specified in a device node or in any + of its parent nodes. + +properties: + $dma-domain-controller: + $ref: /schemas/types.yaml#definitions/phandle + description: + phande to the DMA controller node which should be used for the device or + domain. + +examples: + - | + / { + model = "Texas Instruments K3 AM654 SoC"; + compatible = "ti,am654"; + interrupt-parent = <&gic500>; + /* For modules without device, DDR to DDR is faster on main UDMAP */ + dma-domain-controller = <&main_udmap>; + #address-cells = <2>; + #size-cells = <2>; + ... + }; + + &cbass_main { + /* For modules within MAIN domain, use main UDMAP */ + dma-domain-controller = <&main_udmap>; + + cbass_main_navss: interconnect0 { + ... + main_udmap: dma-controller@31150000 { + compatible = "ti,am654-navss-main-udmap"; + ... + }; + }; + }; + + &cbass_mcu { + /* For modules within MCU domain, use mcu UDMAP */ + dma-domain-controller = <&mcu_udmap>; + + cbass_mcu_navss: interconnect1 { + ... + mcu_udmap: dma-controller@285c0000 { + compatible = "ti,am654-navss-mcu-udmap"; + ... + }; + }; + + fss: fss@47000000 { + compatible = "simple-bus"; + #address-cells = <2>; + #size-cells = <2>; + ranges; + + ospi0: spi@47040000 { + compatible = "ti,am654-ospi", "cdns,qspi-nor"; + ... + /* memcpy channel will be request from mcu_udmap */ + }; + }; + }; +...