From patchwork Mon Oct 11 14:17:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Gerhold X-Patchwork-Id: 12550213 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 431B9C433EF for ; Mon, 11 Oct 2021 14:42:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2E10160BD3 for ; Mon, 11 Oct 2021 14:42:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243578AbhJKOoW (ORCPT ); Mon, 11 Oct 2021 10:44:22 -0400 Received: from mo4-p02-ob.smtp.rzone.de ([85.215.255.80]:36029 "EHLO mo4-p02-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243932AbhJKOoP (ORCPT ); Mon, 11 Oct 2021 10:44:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1633963327; 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=QlQkBSE5R3A2Npl9vikszUeEaPYjjRAXxSR0O82+hq8=; b=Av10zSFZfP7cKIlxhhHUJyCWdgAYHJ2Oi1c10HCzW3vS4OtDK75Rqwf+AuIvA7uAmk uOkeOVEfc9VSHrWv3TpPbqb6Jocagdng6HrbZAY3q2BUOMJ5YF2RGxcCcPhLAsFUFbBC I9kFSc125FsYhJh8O+YC3nT0RirgmtEr/xLSJk/ZXrjxeGty2e7C6z4yqIEpUIG0Yczo EPtUlxXVP8lUxS2QSuyWvXBjvw3tbAIF4S1lLVbOhf5KM3lKGtYuew3W6RdadcOl6Nkl Dcv0Ebgp/e3WSl/C/jOrfJ/V7fPxIRJurkfaKeoEHFums4XHT6lvvj9iNhOAfh8l/mt0 0wbA== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P3gBZUipdd93FF5ZZvYFPugejmSTVR2nRPhVORvLd4SsytBXTbAOHjRHIhr3eFeIrw==" X-RZG-CLASS-ID: mo00 Received: from droid.. by smtp.strato.de (RZmta 47.33.8 SBL|AUTH) with ESMTPSA id 301038x9BEg7tv7 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Mon, 11 Oct 2021 16:42:07 +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: [PATCH net-next v2 1/4] dt-bindings: dmaengine: bam_dma: Add "powered remotely" mode Date: Mon, 11 Oct 2021 16:17:33 +0200 Message-Id: <20211011141733.3999-2-stephan@gerhold.net> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211011141733.3999-1-stephan@gerhold.net> References: <20211011141733.3999-1-stephan@gerhold.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org 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,powered-remotely" property to describe that configuration. Signed-off-by: Stephan Gerhold --- Changes since RFC: - Rename qcom,remote-power-collapse -> qcom,powered-remotely for consistency with "qcom,controlled-remotely" 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..6e9a5497b3f2 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,powered-remotely : 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