From patchwork Wed Jun 17 23:40:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 11610935 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 BF95190 for ; Wed, 17 Jun 2020 23:40:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B02E6218AC for ; Wed, 17 Jun 2020 23:40:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726893AbgFQXko (ORCPT ); Wed, 17 Jun 2020 19:40:44 -0400 Received: from mail.baikalelectronics.com ([87.245.175.226]:57786 "EHLO mail.baikalelectronics.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726848AbgFQXko (ORCPT ); Wed, 17 Jun 2020 19:40:44 -0400 Received: from localhost (unknown [127.0.0.1]) by mail.baikalelectronics.ru (Postfix) with ESMTP id 9C82580045E5; Wed, 17 Jun 2020 23:40:41 +0000 (UTC) X-Virus-Scanned: amavisd-new at baikalelectronics.ru Received: from mail.baikalelectronics.ru ([127.0.0.1]) by localhost (mail.baikalelectronics.ru [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5XwaylCJVy4X; Thu, 18 Jun 2020 02:40:39 +0300 (MSK) From: Serge Semin To: Vinod Koul , Viresh Kumar , Rob Herring CC: Serge Semin , Serge Semin , Rob Herring , Viresh Kumar , Alexey Malahov , Thomas Bogendoerfer , Arnd Bergmann , Andy Shevchenko , , , , Subject: [PATCH v6 2/9] dt-bindings: dma: dw: Add max burst transaction length property Date: Thu, 18 Jun 2020 02:40:21 +0300 Message-ID: <20200617234028.25808-3-Sergey.Semin@baikalelectronics.ru> In-Reply-To: <20200617234028.25808-1-Sergey.Semin@baikalelectronics.ru> References: <20200617234028.25808-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org This array property is used to indicate the maximum burst transaction length supported by each DMA channel. Signed-off-by: Serge Semin Reviewed-by: Rob Herring Acked-by: Viresh Kumar Cc: Alexey Malahov Cc: Thomas Bogendoerfer Cc: Arnd Bergmann Cc: Andy Shevchenko Cc: linux-mips@vger.kernel.org --- Changelog v2: - Rearrange SoBs. - Move $ref to the root level of the properties. So do with the constraints. - Set default max-burst-len to 256 TR-WIDTH words. Changelog v3: - Add more details into the property description about what limitations snps,max-burst-len defines. --- .../bindings/dma/snps,dma-spear1340.yaml | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml index e7611840a7cf..20870f5c14dd 100644 --- a/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml +++ b/Documentation/devicetree/bindings/dma/snps,dma-spear1340.yaml @@ -120,6 +120,21 @@ properties: enum: [0, 1] default: 1 + snps,max-burst-len: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: | + Maximum length of the burst transactions supported by the controller. + This property defines the upper limit of the run-time burst setting + (CTLx.SRC_MSIZE/CTLx.DST_MSIZE fields) so the allowed burst length + will be from 1 to max-burst-len words. It's an array property with one + cell per channel in the units determined by the value set in the + CTLx.SRC_TR_WIDTH/CTLx.DST_TR_WIDTH fields (data width). + items: + maxItems: 8 + items: + enum: [4, 8, 16, 32, 64, 128, 256] + default: 256 + snps,dma-protection-control: $ref: /schemas/types.yaml#definitions/uint32 description: |