From patchwork Mon Jul 19 14:53:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Gerhold X-Patchwork-Id: 12386049 X-Patchwork-Delegate: kuba@kernel.org 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 79BEFC636CE for ; Mon, 19 Jul 2021 15:02:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66C456113A for ; Mon, 19 Jul 2021 15:02:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241866AbhGSOV7 (ORCPT ); Mon, 19 Jul 2021 10:21:59 -0400 Received: from mo4-p02-ob.smtp.rzone.de ([81.169.146.168]:29110 "EHLO mo4-p02-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242651AbhGSOUS (ORCPT ); Mon, 19 Jul 2021 10:20:18 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1626706846; s=strato-dkim-0002; d=gerhold.net; h=References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=6MnR6L4mXMePcbKExrBmlzA/geD023b1awg39iUW1gY=; b=V5IXFQ1bkuRIcrEYRjBENZPC8IKTWeaZvEa2luLmj+ad5HrPjXIMoeeNFm8dZECwpz b4PVGmWLkjHMV5QDI/tiRtJsI22seZy8tonlBEWVz3SQMdL1PYx+NV1rKlcv+rPOaoLQ V/8y0XzqA12VAMWdmEMzqQjpWcCIEW47cl7d0YGAOwyL6JDHkSsboEE6fYD1XfLpJhh0 g17xiXXNDxqFmk1jYJ1dDcDBWCqVn5HGXASgbA5+0npzvNKZg2DeN5A9xyscn/VCP0p9 4GZFEpar4Q5v+vMxyjPSUmpVCSG28bjfAl530yPMWhDaTQhPmPWtGhNcM4uXSuMVBeTh L+mw== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P3gBZUipdd93FF5ZZvYFPugejmSTVR2nRPhVORvLd4SsytBXS7IYBkLahKxB4m6O43/v" X-RZG-CLASS-ID: mo00 Received: from droid.. by smtp.strato.de (RZmta 47.28.1 DYNA|AUTH) with ESMTPSA id g02a44x6JF0g42g (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Mon, 19 Jul 2021 17:00:42 +0200 (CEST) From: Stephan Gerhold To: "David S. Miller" , Jakub Kicinski Cc: Loic Poulain , Sergey Ryazanov , Johannes Berg , Bjorn Andersson , Andy Gross , Vinod Koul , Rob Herring , Aleksander Morgado , netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, Jeffrey Hugo , Stephan Gerhold Subject: [RFC PATCH net-next 1/4] dt-bindings: dmaengine: bam_dma: Add remote power collapse mode Date: Mon, 19 Jul 2021 16:53:14 +0200 Message-Id: <20210719145317.79692-2-stephan@gerhold.net> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210719145317.79692-1-stephan@gerhold.net> References: <20210719145317.79692-1-stephan@gerhold.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org X-Patchwork-State: RFC In some configurations, the BAM DMA controller is set up by a remote processor and the local processor can simply start making use of it without setting up the BAM. This is already supported using the "qcom,controlled-remotely" property. However, for some reason another possible configuration is that the remote processor is responsible for powering up the BAM, but we are still responsible for initializing it (e.g. resetting it etc). Add a "qcom,remote-power-collapse" property to describe that configuration. Signed-off-by: Stephan Gerhold --- NOTE: This is *not* a compile-time requirement for the BAM-DMUX driver so this could also go through the dmaengine tree. Also note that there is an ongoing effort to convert these bindings to DT schema but sadly there were not any updates for a while. :/ https://lore.kernel.org/linux-arm-msm/20210519143700.27392-2-bhupesh.sharma@linaro.org/ --- Documentation/devicetree/bindings/dma/qcom_bam_dma.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt index cf5b9e44432c..362a4f0905a8 100644 --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt @@ -15,6 +15,8 @@ Required properties: the secure world. - qcom,controlled-remotely : optional, indicates that the bam is controlled by remote proccessor i.e. execution environment. +- qcom,remote-power-collapse : optional, indicates that the bam is powered up by + a remote processor but must be initialized by the local processor. - num-channels : optional, indicates supported number of DMA channels in a remotely controlled bam. - qcom,num-ees : optional, indicates supported number of Execution Environments