From patchwork Thu Jan 24 20:24:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 10780091 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 DCF3714E5 for ; Thu, 24 Jan 2019 20:25:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CC64D2ED7D for ; Thu, 24 Jan 2019 20:25:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C002B2EF27; Thu, 24 Jan 2019 20:25:12 +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 65BEE2ED7D for ; Thu, 24 Jan 2019 20:25:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729397AbfAXUZG (ORCPT ); Thu, 24 Jan 2019 15:25:06 -0500 Received: from mail-pg1-f193.google.com ([209.85.215.193]:33343 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728277AbfAXUYc (ORCPT ); Thu, 24 Jan 2019 15:24:32 -0500 Received: by mail-pg1-f193.google.com with SMTP id z11so3176980pgu.0 for ; Thu, 24 Jan 2019 12:24:31 -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=eg4nAxAXcXkNuIrbMcRJ+fzvQseMFVGhfj9rOi7KduU=; b=jSn5gDEIAVqq/AsVfDWAu0cGimFUSBivUdA0jPLdipy5yoRP9CWxJzi1zQ59dvybAW jvjR+VnSVekOGEjqOUEWyqo0R1j4cCywBZ6FW2ye97UtP6Boq3i2a/UOzdAx7SU3BsB0 Gwf6ETiR4Mwx3orGx63y00EwLkMdPy5sceqXg= 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=eg4nAxAXcXkNuIrbMcRJ+fzvQseMFVGhfj9rOi7KduU=; b=ARzEZaO+diDjZpAl37apQlSckse55WdNjMpLq2aq8cPJXi8uq1rM/r3iDW9TDcBqIv 8enQ8OgruhhW7wuzxQnbkEcT6Em+aJHzZIXSwjKwrb/TDDNb4ocgWqGI7li6tOvvDmxc 8Dr9qKDiaUYKqdgtWJchM4gaGxD3Q5Feo7bTk/3XFxdClFPSlqFq0ftzPyWRyG+0WFpM TCCG/l7gEHhheFHcIFg3jRpLL+q38aFlp5OKe6J4+vxs1/fDgXLzrDqb6WUfuJbhT2ql DzgaR6R9+3qpR/gUooCI6eStVw2NYkEcZilggUc0GQipT4DCIQfDuuODEMFyNOe/PE1G 5Oew== X-Gm-Message-State: AJcUukeuHlXInMtOt6vzEMXOfMAYwAe7vcjOV3zA+T3zSEfJE/ggOiOO gxCHb6h889jR9iiwN12fadslwA== X-Google-Smtp-Source: ALg8bN7WMfoTVni+wJrJRkqP8mH/wMyNUMBD9xBmHZIeZSxIsBVF3ZVCZzEcn9jiM+sY2nBzMuKDwQ== X-Received: by 2002:a62:a209:: with SMTP id m9mr8111866pff.218.1548361471229; Thu, 24 Jan 2019 12:24:31 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:4e72:b9ff:fe99:466a]) by smtp.gmail.com with ESMTPSA id c72sm45263309pfb.107.2019.01.24.12.24.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 24 Jan 2019 12:24:30 -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 v5] Documentation: bindings: dma: Add binding for dma-channel-mask Date: Thu, 24 Jan 2019 12:24:17 -0800 Message-Id: <1548361463-28372-3-git-send-email-john.stultz@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1548361463-28372-1-git-send-email-john.stultz@linaro.org> References: <1548361463-28372-1-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 Reviewed-by: Rob Herring Signed-off-by: John Stultz --- 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