From patchwork Wed Jan 16 17:10:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 10766457 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 64CC413A4 for ; Wed, 16 Jan 2019 17:11:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4C1572F25E for ; Wed, 16 Jan 2019 17:11:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4A5322F269; Wed, 16 Jan 2019 17:11:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E2B7C2F240 for ; Wed, 16 Jan 2019 17:11:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405843AbfAPRL3 (ORCPT ); Wed, 16 Jan 2019 12:11:29 -0500 Received: from mail-pl1-f193.google.com ([209.85.214.193]:43293 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2394468AbfAPRKr (ORCPT ); Wed, 16 Jan 2019 12:10:47 -0500 Received: by mail-pl1-f193.google.com with SMTP id gn14so3291281plb.10 for ; Wed, 16 Jan 2019 09:10:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=pJa/3xt1JMxzSbHyVab2zd3RhWbY439V9Orw9mFVXdA=; b=kOB1Q123vSecSRTJ06CsqyBuW9/HImrhm3MqYY0doaB11TP2Dvk+npnTSqQsTfnRcW mTe1bbiGHRs4vn+edG0CtmnyPCzVa6hRASQjKRNBQD5vUqJzCSfGsxe7g9I+sZPV16Hd 3hEdg0wcrJKS+17GRjAwcC1qKLl6RGEh06c3I= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=pJa/3xt1JMxzSbHyVab2zd3RhWbY439V9Orw9mFVXdA=; b=g0q+xwHH4t3o2Lg8V4+/eUi25EQ1Kh4FZ3fmYJTlex01KBwlNxiSVgwQLcp8+VrxPd pcOX7TLEZflNKzeQ0LRoDT86yIwjaxX4VAhHmrQ9XUybg6CdewsQToJJDMFb9vnrK7Pw FluzH9o2IaHIR636uyP13Qfmb6rZzizMR1iC47/GXkglqhibQ2ua/HdQJ0qb1JsXOmKW Q5MaIA9g/dBOrI5bIxvlvpTfWANgt3wAQAL9m0F7BZr8Zt7eyz2aZe4/3T/yD6Hmi7/2 kX+sA6aH5vgIMjebmP6vkjKVJ40ndee/P9zX5F9xWsl06cRF59h/hva3orGsFm0s++3t EZFQ== X-Gm-Message-State: AJcUuke63FYswDtuDcI3L95/a4hVegAmS/ZY+1X4jDfwBK6azAMpXERG fjT040ejTUp3ycWtWTeX282ogA== X-Google-Smtp-Source: ALg8bN53UVr90AHvPfr8dtUoE+UjK3twxa1QIy9kliJAMjdXVHiYMuFJ2I9wblt0BFdSy8YMh/khfA== X-Received: by 2002:a17:902:2a0a:: with SMTP id i10mr10713001plb.323.1547658646183; Wed, 16 Jan 2019 09:10:46 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:4e72:b9ff:fe99:466a]) by smtp.gmail.com with ESMTPSA id h129sm17914023pfb.110.2019.01.16.09.10.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 16 Jan 2019 09:10:44 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Vinod Koul , Rob Herring , Mark Rutland , Tanglei Han , Zhuangluan Su , Ryan Grachek , Manivannan Sadhasivam , dmaengine@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH 2/8 v4] Documentation: bindings: dma: Add binding for dma-channel-mask Date: Wed, 16 Jan 2019 09:10:23 -0800 Message-Id: <1547658629-25378-3-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1547658629-25378-1-git-send-email-john.stultz@linaro.org> References: <1547658629-25378-1-git-send-email-john.stultz@linaro.org> Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some dma channels can be reserved for secure mode or other hardware on the SoC, so provide a binding for a bitmask listing the available channels for the kernel to use. This follows the pre-existing bcm,dma-channel-mask binding. Cc: Vinod Koul Cc: Rob Herring Cc: Mark Rutland Cc: Tanglei Han Cc: Zhuangluan Su Cc: Ryan Grachek Cc: Manivannan Sadhasivam Cc: dmaengine@vger.kernel.org Cc: devicetree@vger.kernel.org Signed-off-by: John Stultz Reviewed-by: Rob Herring --- v3: Renamed to hisi-dma-avail-chan v4: Reworked to generic dma-channel-mask --- Documentation/devicetree/bindings/dma/dma.txt | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/devicetree/bindings/dma/dma.txt b/Documentation/devicetree/bindings/dma/dma.txt index 6312fb0..eeb4e4d 100644 --- a/Documentation/devicetree/bindings/dma/dma.txt +++ b/Documentation/devicetree/bindings/dma/dma.txt @@ -16,6 +16,9 @@ Optional properties: - dma-channels: Number of DMA channels supported by the controller. - dma-requests: Number of DMA request signals supported by the controller. +- dma-channel-mask: Bitmask of available DMA channels in ascending order + that are not reserved by firmware and are available to + the kernel. i.e. first channel corresponds to LSB. Example: @@ -29,6 +32,7 @@ Example: #dma-cells = <1>; dma-channels = <32>; dma-requests = <127>; + dma-channel-mask = <0xfffe> }; * DMA router