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=-14.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 C7A54C12002 for ; Wed, 14 Jul 2021 19:27:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AD7C3613C9 for ; Wed, 14 Jul 2021 19:27:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229721AbhGNTaD (ORCPT ); Wed, 14 Jul 2021 15:30:03 -0400 Received: from mail-il1-f175.google.com ([209.85.166.175]:33624 "EHLO mail-il1-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229650AbhGNTaC (ORCPT ); Wed, 14 Jul 2021 15:30:02 -0400 Received: by mail-il1-f175.google.com with SMTP id z1so2751599ils.0; Wed, 14 Jul 2021 12:27:10 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=RzPhtbgpbxnOvk9KnY8WTPdMhffL639krC2aO6F+axU=; b=Uq6PsLoR/abnq414Rswh511c+OAbWqH2D+YaJuzTeFSffYUhiqn9rzEn5kA6xn9aB1 jZkZ3GGvuIZBbpJnHKq3rET2/nKZtIt9WqWYQNWRTCJxDGyMxTPdEnRCbK+MNRhZMbrm TspJMcBuY1jE4phNt2seqNNnxYwKX0OMAvsgfFtnKjZYKfmqFke0de9ZznXr12PJlluy XIkfcwx/FHap0nzkTLOQXlB/9BrKDvFOEx8dQoKgOrgJJQQyaTitfxINhngiJdz7Ct1u z37thi14bPiq2d76Kj667xa+oNCdrvRmO2rAgnde9nQsz62fFt7Kdv31bjVrqFJ3xBCU 97rg== X-Gm-Message-State: AOAM533PC0u2JbAP09eYfgCayuikEGQwOeB6rOu7i7TyLTnphR7czZoB JQxVPVmoIAxm2MAnK3EEv7WZaD0Bfw== X-Google-Smtp-Source: ABdhPJym1dGtLhVjJOsI52JP8TEA6Em+rrrz6Bg6Vyph2weEybKYkuer9VVBZkwLRLrDFITR1rJA+g== X-Received: by 2002:a05:6e02:5ad:: with SMTP id k13mr7656353ils.284.1626290830593; Wed, 14 Jul 2021 12:27:10 -0700 (PDT) Received: from robh.at.kernel.org ([64.188.179.248]) by smtp.gmail.com with ESMTPSA id f4sm1722768ile.8.2021.07.14.12.27.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jul 2021 12:27:09 -0700 (PDT) Received: (nullmailer pid 3078602 invoked by uid 1000); Wed, 14 Jul 2021 19:27:05 -0000 Date: Wed, 14 Jul 2021 13:27:05 -0600 From: Rob Herring To: Amelie Delaunay Cc: Pierre-Yves Mordret , Dan Williams , Vinod Koul , Rob Herring , dmaengine@vger.kernel.org, Alexandre Torgue , Maxime Coquelin , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH 1/2] dt-bindings: dma: add alternative REQ/ACK protocol selection in stm32-dma Message-ID: <20210714192705.GA3078178@robh.at.kernel.org> References: <20210624093959.142265-1-amelie.delaunay@foss.st.com> <20210624093959.142265-2-amelie.delaunay@foss.st.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210624093959.142265-2-amelie.delaunay@foss.st.com> Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org On Thu, 24 Jun 2021 11:39:58 +0200, Amelie Delaunay wrote: > Default REQ/ACK protocol consists in maintaining ACK signal up to the > removal of REQuest and the transfer completion. > In case of alternative REQ/ACK protocol, ACK de-assertion does not wait the > removal of the REQuest, but only the transfer completion. > Due to a possible DMA stream lock when transferring data to/from STM32 > USART/UART, this new bindings allow to select this alternative protocol in > device tree, especially for STM32 USART/UART nodes. > > Signed-off-by: Amelie Delaunay > --- > Documentation/devicetree/bindings/dma/st,stm32-dma.yaml | 7 +++++++ > 1 file changed, 7 insertions(+) > Acked-by: Rob Herring