From patchwork Sat Nov 27 17:31:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Gerhold X-Patchwork-Id: 12642467 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B9F3C4332F for ; Sat, 27 Nov 2021 17:44:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355799AbhK0Rry (ORCPT ); Sat, 27 Nov 2021 12:47:54 -0500 Received: from mo4-p02-ob.smtp.rzone.de ([81.169.146.171]:22145 "EHLO mo4-p02-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1355743AbhK0Rpw (ORCPT ); Sat, 27 Nov 2021 12:45:52 -0500 X-Greylist: delayed 357 seconds by postgrey-1.27 at vger.kernel.org; Sat, 27 Nov 2021 12:45:52 EST DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1638034591; 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=jADl+0pzwalMNbG9yT9wWk2B3jNKOzevQ6az2e/MJF8=; b=F+tlBKLvD62KK2AerYnY+XNWaDMwC6U3QqMwoPNhaFMf+KiN3uCIdf/r06KvtAaP2N oge6qsLCGjmcnI2UsA+EG1+of+1MrckH53MsEbWsRz7ysNu+fbnkGdFG4Cv9mL6cJNOc yY9o8b6wHLPYCno8O2EuI25vaaeihCT4SABihfWiN3BzZY4NSjQQ7zaUK5Xut+CY/dOC VsvzCYsMCjTQ6Zng8to50Fx03D5JUsSyumraMRmw049+vK3m4W1G2mYAzPaOmV5/LP1+ ImF2HHuUpvG5OKa9IRBDK0+eOu9dyb2w6KrEQNGV4uKGqKF+LIUw7v5HfJjqrKWPPmFx /hCw== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P3gBZUipdd93FF5ZZvYFPugejmSTVR2nRPhVORvLd4SsytBXQ7UOGqRde+a0fiL/b+s=" X-RZG-CLASS-ID: mo00 Received: from droid.. by smtp.strato.de (RZmta 47.34.10 AUTH) with ESMTPSA id j03bcbxARHaUFuJ (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Sat, 27 Nov 2021 18:36:30 +0100 (CET) From: Stephan Gerhold To: "David S. Miller" , Jakub Kicinski Cc: Loic Poulain , Sergey Ryazanov , Johannes Berg , Bjorn Andersson , Andy Gross , Rob Herring , Aleksander Morgado , netdev@vger.kernel.org, linux-arm-msm@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 v3 1/2] dt-bindings: net: Add schema for Qualcomm BAM-DMUX Date: Sat, 27 Nov 2021 18:31:07 +0100 Message-Id: <20211127173108.3992-2-stephan@gerhold.net> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211127173108.3992-1-stephan@gerhold.net> References: <20211127173108.3992-1-stephan@gerhold.net> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The BAM Data Multiplexer provides access to the network data channels of modems integrated into many older Qualcomm SoCs, e.g. Qualcomm MSM8916 or MSM8974. It is built using a simple protocol layer on top of a DMA engine (Qualcomm BAM) and bidirectional interrupts to coordinate power control. The device tree node combines the incoming interrupt with the outgoing interrupts (smem-states) as well as the two DMA channels, which allows the BAM-DMUX driver to request all necessary resources. Signed-off-by: Stephan Gerhold --- Changes in v2: Clarify that bam-dmux does not directly describe a hardware block but actually a "firmware convention" that combines different hardware blocks that are described separately. Changes since RFC: None. --- .../bindings/net/qcom,bam-dmux.yaml | 92 +++++++++++++++++++ 1 file changed, 92 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/qcom,bam-dmux.yaml diff --git a/Documentation/devicetree/bindings/net/qcom,bam-dmux.yaml b/Documentation/devicetree/bindings/net/qcom,bam-dmux.yaml new file mode 100644 index 000000000000..b30544410d09 --- /dev/null +++ b/Documentation/devicetree/bindings/net/qcom,bam-dmux.yaml @@ -0,0 +1,92 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/net/qcom,bam-dmux.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Qualcomm BAM Data Multiplexer + +maintainers: + - Stephan Gerhold + +description: | + The BAM Data Multiplexer provides access to the network data channels + of modems integrated into many older Qualcomm SoCs, e.g. Qualcomm MSM8916 + or MSM8974. It is built using a simple protocol layer on top of a DMA engine + (Qualcomm BAM DMA) and bidirectional interrupts to coordinate power control. + + Note that this schema does not directly describe a hardware block but rather + a firmware convention that combines several other hardware blocks (such as the + DMA engine). As such it is specific to a firmware version, not a particular + SoC or hardware version. + +properties: + compatible: + const: qcom,bam-dmux + + interrupts: + description: + Interrupts used by the modem to signal the AP. + Both interrupts must be declared as IRQ_TYPE_EDGE_BOTH. + items: + - description: Power control + - description: Power control acknowledgment + + interrupt-names: + items: + - const: pc + - const: pc-ack + + qcom,smem-states: + $ref: /schemas/types.yaml#/definitions/phandle-array + description: State bits used by the AP to signal the modem. + items: + - description: Power control + - description: Power control acknowledgment + + qcom,smem-state-names: + description: Names for the state bits used by the AP to signal the modem. + items: + - const: pc + - const: pc-ack + + dmas: + items: + - description: TX DMA channel phandle + - description: RX DMA channel phandle + + dma-names: + items: + - const: tx + - const: rx + +required: + - compatible + - interrupts + - interrupt-names + - qcom,smem-states + - qcom,smem-state-names + - dmas + - dma-names + +additionalProperties: false + +examples: + - | + #include + + mpss: remoteproc { + bam-dmux { + compatible = "qcom,bam-dmux"; + + interrupt-parent = <&modem_smsm>; + interrupts = <1 IRQ_TYPE_EDGE_BOTH>, <11 IRQ_TYPE_EDGE_BOTH>; + interrupt-names = "pc", "pc-ack"; + + qcom,smem-states = <&apps_smsm 1>, <&apps_smsm 11>; + qcom,smem-state-names = "pc", "pc-ack"; + + dmas = <&bam_dmux_dma 4>, <&bam_dmux_dma 5>; + dma-names = "tx", "rx"; + }; + };