From patchwork Thu Sep 9 10:29:05 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ChiaWei Wang X-Patchwork-Id: 508466 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 3DA13C433EF for ; Thu, 9 Sep 2021 10:29:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22BEF61179 for ; Thu, 9 Sep 2021 10:29:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233864AbhIIKah (ORCPT ); Thu, 9 Sep 2021 06:30:37 -0400 Received: from twspam01.aspeedtech.com ([211.20.114.71]:59782 "EHLO twspam01.aspeedtech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233802AbhIIKag (ORCPT ); Thu, 9 Sep 2021 06:30:36 -0400 Received: from mail.aspeedtech.com ([192.168.0.24]) by twspam01.aspeedtech.com with ESMTP id 189A9ire075151; Thu, 9 Sep 2021 18:09:44 +0800 (GMT-8) (envelope-from chiawei_wang@aspeedtech.com) Received: from ChiaWeiWang-PC.aspeed.com (192.168.2.66) by TWMBX02.aspeed.com (192.168.0.24) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 9 Sep 2021 18:29:14 +0800 From: Chia-Wei Wang To: , , , , , , , CC: , Subject: [PATCH v3 1/3] dt-bindings: aspeed: Add UART routing controller Date: Thu, 9 Sep 2021 18:29:05 +0800 Message-ID: <20210909102907.32037-2-chiawei_wang@aspeedtech.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210909102907.32037-1-chiawei_wang@aspeedtech.com> References: <20210909102907.32037-1-chiawei_wang@aspeedtech.com> MIME-Version: 1.0 X-Originating-IP: [192.168.2.66] X-ClientProxiedBy: TWMBX02.aspeed.com (192.168.0.24) To TWMBX02.aspeed.com (192.168.0.24) X-DNSRBL: X-MAIL: twspam01.aspeedtech.com 189A9ire075151 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add dt-bindings for Aspeed UART routing controller. Signed-off-by: Oskar Senft Signed-off-by: Chia-Wei Wang --- .../bindings/soc/aspeed/uart-routing.yaml | 70 +++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml diff --git a/Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml b/Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml new file mode 100644 index 000000000000..e7071f1abc03 --- /dev/null +++ b/Documentation/devicetree/bindings/soc/aspeed/uart-routing.yaml @@ -0,0 +1,70 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# # Copyright (c) 2018 Google LLC +# # Copyright (c) 2021 Aspeed Technology Inc. +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/soc/aspeed/uart-routing.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: Aspeed UART Routing Controller + +maintainers: + - Oskar Senft + - Chia-Wei Wang + +description: + The Aspeed UART routing control allow to dynamically route the inputs for + the built-in UARTS and physical serial I/O ports. + + This allows, for example, to connect the output of UART to another UART. + This can be used to enable Host <-> BMC communication via UARTs, e.g. to + allow access to the Host's serial console. + + This driver is for the BMC side. The sysfs files allow the BMC userspace + which owns the system configuration policy, to configure how UARTs and + physical serial I/O ports are routed. + + Two types of files, uart* and io*, are presented in sysfs. The uart* + configures the input signal of a UART controller whereas io* configures + that of a physical serial port. + + When read, each file shows the list of available options with currently + selected option marked by brackets "[]". The list of available options + depends on the selected file. + + e.g. + cat /sys/bus/platform/drivers/aspeed-uart-routing/*.uart_routing/uart1 + [io1] io2 io3 io4 uart2 uart3 uart4 io6 + + In this case, UART1 gets its input from IO1 (physical serial port 1). + +properties: + compatible: + items: + - enum: + - aspeed,ast2400-uart-routing + - aspeed,ast2500-uart-routing + - aspeed,ast2600-uart-routing + reg: + maxItems: 1 + +required: + - compatible + +additionalProperties: false + +examples: + - | + lpc: lpc@1e789000 { + compatible = "aspeed,ast2600-lpc-v2", "simple-mfd", "syscon"; + reg = <0x1e789000 0x1000>; + + #address-cells = <1>; + #size-cells = <1>; + ranges = <0x0 0x1e789000 0x1000>; + + uart_routing: espi-routing@98 { + compatible = "aspeed,ast2600-uart-routing"; + reg = <0x98 0x8>; + }; + };