From patchwork Thu Nov 5 21:21:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Hilber X-Patchwork-Id: 321406 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=-9.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED 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 A7891C388F7 for ; Thu, 5 Nov 2020 21:28:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5ED5F20756 for ; Thu, 5 Nov 2020 21:28:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732462AbgKEV2d (ORCPT ); Thu, 5 Nov 2020 16:28:33 -0500 Received: from plasma4.jpberlin.de ([80.241.57.33]:37469 "EHLO plasma4.jpberlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732156AbgKEV2O (ORCPT ); Thu, 5 Nov 2020 16:28:14 -0500 Received: from spamfilter01.heinlein-hosting.de (spamfilter01.heinlein-hosting.de [80.241.56.115]) by plasma.jpberlin.de (Postfix) with ESMTP id 685EDABBC9; Thu, 5 Nov 2020 22:21:53 +0100 (CET) X-Virus-Scanned: amavisd-new at heinlein-support.de Received: from plasma.jpberlin.de ([80.241.56.68]) by spamfilter01.heinlein-hosting.de (spamfilter01.heinlein-hosting.de [80.241.56.115]) (amavisd-new, port 10030) with ESMTP id fzjoFdtuPM-S; Thu, 5 Nov 2020 22:21:52 +0100 (CET) Received: from webmail.opensynergy.com (unknown [217.66.60.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (Client CN "*.opensynergy.com", Issuer "Starfield Secure Certificate Authority - G2" (not verified)) (Authenticated sender: opensynergy@jpberlin.de) by plasma.jpberlin.de (Postfix) with ESMTPSA id D2C75AB986; Thu, 5 Nov 2020 22:21:51 +0100 (CET) From: Peter Hilber To: , , , CC: Igor Skalkin , Peter Hilber , Rob Herring , , , , , , , , "Michael S. Tsirkin" , Jason Wang Subject: [RFC PATCH v2 09/10] dt-bindings: arm: Add virtio transport for SCMI Date: Thu, 5 Nov 2020 22:21:15 +0100 Message-ID: <20201105212116.411422-10-peter.hilber@opensynergy.com> In-Reply-To: <20201105212116.411422-1-peter.hilber@opensynergy.com> References: <20201105212116.411422-1-peter.hilber@opensynergy.com> MIME-Version: 1.0 X-ClientProxiedBy: SR-MAIL-01.open-synergy.com (10.26.10.21) To SR-MAIL-01.open-synergy.com (10.26.10.21) X-MBO-SPAM-Probability: X-Rspamd-Score: -3.07 / 15.00 / 15.00 X-Rspamd-Queue-Id: 685EDABBC9 X-Rspamd-UID: d798ee Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Igor Skalkin Document the properties for arm,scmi-virtio compatible nodes. The backing virtio SCMI device is described in patch [1]. [1] https://lists.oasis-open.org/archives/virtio-comment/202005/msg00096.html Co-developed-by: Peter Hilber Signed-off-by: Peter Hilber Signed-off-by: Igor Skalkin --- .../devicetree/bindings/arm/arm,scmi.txt | 35 +++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/arm/arm,scmi.txt b/Documentation/devicetree/bindings/arm/arm,scmi.txt index 55deb68230eb..6ded49d82773 100644 --- a/Documentation/devicetree/bindings/arm/arm,scmi.txt +++ b/Documentation/devicetree/bindings/arm/arm,scmi.txt @@ -13,6 +13,9 @@ the device tree. Required properties: The scmi node with the following properties shall be under the /firmware/ node. +Some properties are specific to a transport type. + +shmem-based transports (mailbox, smc/hvc): - compatible : shall be "arm,scmi" or "arm,scmi-smc" for smc/hvc transports - mboxes: List of phandle and mailbox channel specifiers. It should contain @@ -21,6 +24,15 @@ The scmi node with the following properties shall be under the /firmware/ node. supported. - shmem : List of phandle pointing to the shared memory(SHM) area as per generic mailbox client binding. + +Virtio transport: + +- compatible : shall be "arm,scmi-virtio". + +The virtio transport only supports a single device. + +Additional required properties: + - #address-cells : should be '1' if the device has sub-nodes, maps to protocol identifier for a given sub-node. - #size-cells : should be '0' as 'reg' property doesn't have any size @@ -42,7 +54,8 @@ Each protocol supported shall have a sub-node with corresponding compatible as described in the following sections. If the platform supports dedicated communication channel for a particular protocol, the 3 properties namely: mboxes, mbox-names and shmem shall be present in the sub-node corresponding -to that protocol. +to that protocol. The virtio transport does not support dedicated communication +channels. Clock/Performance bindings for the clocks/OPPs based on SCMI Message Protocol ------------------------------------------------------------ @@ -106,7 +119,8 @@ Required sub-node properties: [4] Documentation/devicetree/bindings/sram/sram.yaml [5] Documentation/devicetree/bindings/reset/reset.txt -Example: +Example (mailbox transport): +---------------------------- sram@50000000 { compatible = "mmio-sram"; @@ -195,3 +209,20 @@ thermal-zones { ... }; }; + +Example (virtio transport): +--------------------------- + +virtio_mmio@4b001000 { + compatible = "virtio,mmio"; + ... +}; + +firmware { + ... + scmi { + compatible = "arm,scmi-virtio"; + ... + +The rest is similar to the mailbox transport example, when omitting the +mailbox/shmem-specific properties.