From patchwork Mon Sep 2 16:38:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Farouk Bouabid X-Patchwork-Id: 13787508 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C760FCA0ED3 for ; Mon, 2 Sep 2024 16:41:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version:Cc:To: In-Reply-To:References:Message-Id:Content-Transfer-Encoding:Content-Type: Subject:Date:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UcCuFOjTGlWzlp1gGW8rLBBx1JsJ8UOIW0H4v78wFv0=; b=HlzLTJMXCXhPf2imOerBJOTRXd poSWG5CpnQy0P6Dj8eI/+sVe/9sPQZ23Hd/jZV/YXeljPeEHb6Fvi2rj4C9nXCqZcfPi0AdfoftSD kysAj8DwYcJi0CSAVXRrM+4eQSETV8NEhXqvVzkIGODIKgyEnjWuHdCRuzQ0WwBtmddArgubDWLNw p7decN789orEgDUxkbWpoZF9WA1f+2ANvtw5FG9lksM3iT74dthufle4nyrGCWQZautZ6nruDG790 2CBTa87w1hKD0L7OEaVaLds9rSUsYkIx+epgrs1xKs4jzUD8AqzQ6zGARrrC6T0ZiFyzhFzQ9Be6u o6BDFkvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1slA7V-0000000F3dv-1S7w; Mon, 02 Sep 2024 16:41:37 +0000 Received: from mail-db5eur02on2062c.outbound.protection.outlook.com ([2a01:111:f403:2608::62c] helo=EUR02-DB5-obe.outbound.protection.outlook.com) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1slA4k-0000000F2et-2cjL; Mon, 02 Sep 2024 16:38:48 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=H/Dh5RV+5nJF8BXFSx4h5BMbjF1bAas0LVw5W0LczmA/SBJTO+j1+jmIf/DRP7W2vRoCHPXmE3M1/nUO1XIkuAna8uswVbq0E/FrJC69TxckDdp892bgTEG/VNEI2hXzA77Pv6ub/18fg9AgecNPZ1ALSCZXQHc3monzro7vlCQb4vQmnxDjjBWIYh9hbQfmPscwDJYmZyxf6GGXuUjCL6GgBJEsZkO9F7ECaK0LJ3YhvQlcu9h//6ivv3UZ3karZU1/eyIiMw9gFPW6/N0Ha+rWTdeoZ7GQdTD+K3MvD2qCZeqWBhmZJJnKsGjvJaJSXuYgim5Zf2bF2gRs8U9JUQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=UcCuFOjTGlWzlp1gGW8rLBBx1JsJ8UOIW0H4v78wFv0=; b=gz5NeNChUoMKXgzg93I1pFPKj+R50UtKml1K1aWMRBKzzO6p4hxJCRxIS3Vk0rZjCdIGlkUMFTL4FdIX0F5NBKZ5cctVRwlazwbBDop9lMnqTxAYIlRVUPDrAhVlipQDtsYGfaRiZHR+I6l7IysvSmbGQ1aI8PuSYc9lf7xGkktJhfmvcLnTl0UV7yXqJ4dMoDswaaDhCs/GIbxunyOBdZS8GuSoStarJLIS0XGgZ+0+qMMpB/Q7CeJYKqSDPRjO5emxoz+YmHtHbwHvU4PiGNca9GvVpqvX6aJiyEXdoq8xztMk984tiyIgGoDGjUdyb1/HkiIQaft0pLcwMWrGyA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=cherry.de; dmarc=pass action=none header.from=cherry.de; dkim=pass header.d=cherry.de; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cherry.de; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=UcCuFOjTGlWzlp1gGW8rLBBx1JsJ8UOIW0H4v78wFv0=; b=DeATiyKYhi5USasD+4f1AwUsTGQn3nlbA76rCn9VAxn1LmUfdZmX/tmZDwlLl7fbMsvXjJgvzmqWArtQ7yTlm5Mqt5ERTCu3WOtBvKHkEYkku0rMnx+PV/xUf2KaHZ/vAHFlaVEZAZiukWCmXKltcRqVLLp5yYXIOcfZcjB3g+o= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=cherry.de; Received: from DU0PR04MB9562.eurprd04.prod.outlook.com (2603:10a6:10:321::10) by DB9PR04MB9645.eurprd04.prod.outlook.com (2603:10a6:10:309::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7918.24; Mon, 2 Sep 2024 16:38:34 +0000 Received: from DU0PR04MB9562.eurprd04.prod.outlook.com ([fe80::ad4d:8d53:1663:d181]) by DU0PR04MB9562.eurprd04.prod.outlook.com ([fe80::ad4d:8d53:1663:d181%6]) with mapi id 15.20.7918.020; Mon, 2 Sep 2024 16:38:34 +0000 From: Farouk Bouabid Date: Mon, 02 Sep 2024 18:38:15 +0200 Subject: [PATCH v7 2/8] i2c: muxes: add support for tsd,mule-i2c multiplexer Message-Id: <20240902-dev-mule-i2c-mux-v7-2-bf7b8f5385ed@cherry.de> References: <20240902-dev-mule-i2c-mux-v7-0-bf7b8f5385ed@cherry.de> In-Reply-To: <20240902-dev-mule-i2c-mux-v7-0-bf7b8f5385ed@cherry.de> To: Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Farouk Bouabid , Quentin Schulz , Peter Rosin , Jean Delvare , Guenter Roeck , Heiko Stuebner Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, Wolfram Sang X-Mailer: b4 0.15-dev-99b12 X-ClientProxiedBy: VI1PR0502CA0001.eurprd05.prod.outlook.com (2603:10a6:803:1::14) To DU0PR04MB9562.eurprd04.prod.outlook.com (2603:10a6:10:321::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DU0PR04MB9562:EE_|DB9PR04MB9645:EE_ X-MS-Office365-Filtering-Correlation-Id: 90a4fc52-cf83-429c-855e-08dccb6db022 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|52116014|7416014|376014|38350700014|921020; X-Microsoft-Antispam-Message-Info: =?utf-8?q?hxAZ7qrczwoKD5lQ02L+FG1Mi32nMdB?= =?utf-8?q?CKXbeJN49g52XL25BtdAzxDH5wxlXE5bD1e338fMd2Z1QPZrGXXYgQbDPhgYHjawS?= =?utf-8?q?YSbTSQ4cxV5MQVN7yFg4Q910nhQMYlGfpmxWrvocaGT0VXUOhNE9/hFN9kxwfA9h2?= =?utf-8?q?PU2oNy1FojcioyTfXPwdz19vQHVNpWzTkx89N9YQFv5Z5jmJVUNyK/Pt0ZnFE/7Oe?= =?utf-8?q?Ix7WuTw3sX0HiKyVgCS2KNhv3Xl0QZ4p7YaE1QEGq6Y1seIEEby0gyBjieljRJ1p1?= =?utf-8?q?mbu82Bgzd94l/+NSvbvfTX6BibJajb2OVDwUJ8BOfOGZQG5XnEorgHRc0BxYToJPm?= =?utf-8?q?EWe4KylMjxTaHVaWQCvYaTIYSjh3uHv2PuyvAUKmoVOeB0/RYwXRGBamynQS1W8Md?= =?utf-8?q?BCGg+85QX9AEago5hHZyyzOAdTMHmDz+Zu5TFxBuUWmZHeqFrfuqbTVFV1QbBLlMn?= =?utf-8?q?UdGL1wtPV2cDUr40J7N6Bl+WV40xN3sR19ofe5xDMpSOyKRdfrkNFFLLidfKR6xZr?= =?utf-8?q?5r9DpWuXHGRTyx7Me/M4NSn3JAOhELiuGGrdOGL5SfUqvRsXWILVzTxp37vXsIWxI?= =?utf-8?q?agdjIF8uCKhdXZQcxew0K3mJE6OnezudLwtTKbwue9/pWDnVD2HRXF46s3IBZaKqB?= =?utf-8?q?3hd/LqMGIoPQkqLhJ0b6LpRpSbx9lQU8O95g4xM201OqiZBkN1YEgUQOQLR+0Heav?= =?utf-8?q?FpkGhBmv1zocdw2J9ai3BjSWV/HEJBHUss+asY51sR3y5RMMLGwvNhrcUgMxzg3JP?= =?utf-8?q?djA9tl/nCmTeNpyy5QUjWtld16SMp1h6ENkWv8FKaaeQkhXRxVl6U75AJDaE044Dd?= =?utf-8?q?PhEAUAppXQxAoA5LJ7jbg5uyJPf7k7jXQLh9MKO5j2vlwhX1KLIxsZuFUL77MzaYf?= =?utf-8?q?xEwxsnU3w8EuseQBOBuB2xO3eRsnvHS5In4EZ+6spSV1/kdwQvjciPRG+rU7DbQYk?= =?utf-8?q?GT0HLOrv/S0ojY/XZSLYl0J4l32ckt3XPHux8nRuzAx+BSXqBU6D5KzBgWU0P607A?= =?utf-8?q?0hvEIU7x6wzisNY/9zyh5bvw0uRCailWmq5mNFBEAQVN6bUetUDbT5/Bl4NA4OLWD?= =?utf-8?q?XcTwrvU3iM0arICPmXVDZEdtCUJgRmzxP1wQSqZo+DxO6Mt5dQzcYQHR+FV1rNWIm?= =?utf-8?q?SiMPUDoI6gNyu5hVrIRVCkYurrk4nBNG6N8CQa8Y6heaGPdTwFQ03hsNFCUJAXSko?= =?utf-8?q?EGx6kSyoldLYxELrR1Isjuv0sQZlx7WK7KA6JBtyXgWImHK3C8VLX9TEBIhsr5ctG?= =?utf-8?q?2yOwL8pIch9U2G+ITG4map7YFCDlAndbJThxNkKpxN/Y92Ip8al6D0MDTAfeotZv9?= =?utf-8?q?8cUHU9JQjqGtFw+/kWuiTJcngZRMWDn++Y4z8oSqtXsJs+1ETkT/qn4=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DU0PR04MB9562.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(366016)(52116014)(7416014)(376014)(38350700014)(921020);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?q?qujqCShsAau/7wl6UaKnPBiezH4L?= =?utf-8?q?E9a4n812Lj7hk61GoF+nDj2x1XiL/Q82DRp6bY9aizdT19nbXeXCeXo6SZ3njKB+j?= =?utf-8?q?Mz5LSZpCNRyuik12cyGFTRVRDBdM6TIQZKKiHVoVMa2N0G5LQe9NASzN3d3gnLht5?= =?utf-8?q?o88QaOTu64fdhtedZ5GNhDC0m+Qe0rSWtahXk3Y8WouSjzMxTqVB4jtHTPSWgq2D7?= =?utf-8?q?G90qRicEhf0EKsER8YB/+cdc9WdXDGk/4F/TuO7gz7xC16CHAkNi6HccNk1VwLB+n?= =?utf-8?q?1kQ+2lSKfkoWE2gCai0FNrjWLn5lqDgbVs7z+qo1AKMmJbpM2vuXyPN3K0u6t1+49?= =?utf-8?q?nljnw0acfaDbslE+bRe7QA/rYgK/tMigKOw230+guJuxoiz7nHHkL2uyJLcOx4LFy?= =?utf-8?q?9cRn/LPttLUT6u2v9UbG4G3eMFCBtreqdSujrfTLii8VfmnQPBxFTvamufTkb0+Ve?= =?utf-8?q?7ww75epEBn2UvbqTIJNt8dUu4my6UEsl2/ifd9AG2OPMwrJRuSQlTDeYkZZ5UifTp?= =?utf-8?q?2fUq2vlYEfl+e+OaARPhozYun+s9pj4o2d+iLkuYu+EogQyYfdIXbtyLjdW848Xse?= =?utf-8?q?c7xJcqjNudiCk/VC1D1f9hj1VqWavgskTh0rwk1LIdLyr5EXKQTvP0ffovfbwMuem?= =?utf-8?q?7PLaH2bl3YuIz28XiuCCQrp6z34CJG6Bo8njEBYjRtoR3sYqC9cS5wmYeiiIZizop?= =?utf-8?q?egBKCZDEme8M8AtQVZ+4GL5XfiuBTew3H5XQsEJryu5DiKP94LkMbgHOxZKTuUzaU?= =?utf-8?q?aoc5+tpiZaA7OKv1D9QpCHvRbWa8UC1tUXpzP+pkhiJZWvbreaaX2c7YQgj2ln9Px?= =?utf-8?q?dmS2QkBQ/j/ooaj51vRXUNxv/W6Csv9Php2ozyeb5njr3EjPljxj5Z+A1NRBw2Ri2?= =?utf-8?q?1Hn61p/3vBNaYp7YR/NNiFuVXGkNoDue8xhs2iE40wgZSW16HluJMgscjoPCA7aiC?= =?utf-8?q?IFYEagnKVfYuNR7bixLKdAylNXCdFwKBKLZ+3q14UHEkC7+FcUEZjNjS4sj5x82CJ?= =?utf-8?q?mp1O3PjML8+ASq0239Y50lSA4CSMzuc3cUbuwzis2B+o7IB0ygtBCVdiAI39R9pYK?= =?utf-8?q?Z+1dwIdCc7tue0LF4CjIuHmyAWKC4zy1rMGYYUdN3Y5IyuAneUQ6Suh0yyEJ7Qglh?= =?utf-8?q?iM/8gEg19WzFJBk4uc/5LmqIScVthbc9iXKVb5IBnvJcjuLy5LFysg5lJYGSFhKJK?= =?utf-8?q?VmT1uvovbpT4eLVz37mymaNY0B84tAca6LOtUzkCzL5mQEpT7waMQna89kh+IZyHd?= =?utf-8?q?5ErUnnsDuvRCFLGgqXgcQPpipEDe23O5DQU72ddLitt9nug2uQnH4PFRdMXSCiFU9?= =?utf-8?q?IOqYViFqU6zNPJOsw1zuRJWByNUL1xKZshnHTuOxqj2HVyYhf82//LPC4Wj7B5Jul?= =?utf-8?q?4kDGWWzPK8zV7aXkode+vezCcOr9SNi+lGWT2fICHS5aFZ1k2lR13pQvpgnW45Lx9?= =?utf-8?q?6fl6iCemscYW+GWjHmeQvkQgqoYCuyEfKSas+K1n1tCnTcI8zM1EkLl6N8uYfEzaF?= =?utf-8?q?D33BMPYmKEZG+WFEk0BJDaxCa803o8S30A=3D=3D?= X-OriginatorOrg: cherry.de X-MS-Exchange-CrossTenant-Network-Message-Id: 90a4fc52-cf83-429c-855e-08dccb6db022 X-MS-Exchange-CrossTenant-AuthSource: DU0PR04MB9562.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Sep 2024 16:38:34.7390 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5e0e1b52-21b5-4e7b-83bb-514ec460677e X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: MG/k6KYgv1p2b0xrhmOcHTlu4pP3aerFH2U8ZAHyk9woyjn2vowOrqgLlR8zdXakGuTKxe23MUTY3+gT30qxhP4ttO9QWoFsozXht07M01Q= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR04MB9645 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240902_093846_862546_B3AFC2EA X-CRM114-Status: GOOD ( 19.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Theobroma Systems Mule is an MCU that emulates a set of I2C devices, among which an amc6821 and devices that are reachable through an I2C-mux. The devices on the mux can be selected by writing the appropriate device number to an I2C config register (amc6821 reg 0xff). This driver is expected to be probed as a platform device with amc6821 as its parent i2c device. Add support for the mule-i2c-mux platform driver. The amc6821 driver support for the mux will be added in a later commit. Reviewed-by: Wolfram Sang Signed-off-by: Farouk Bouabid --- drivers/i2c/muxes/Kconfig | 16 +++++ drivers/i2c/muxes/Makefile | 1 + drivers/i2c/muxes/i2c-mux-mule.c | 148 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 165 insertions(+) diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index db1b9057612a..6d2f66810cdc 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -119,4 +119,20 @@ config I2C_MUX_MLXCPLD This driver can also be built as a module. If so, the module will be called i2c-mux-mlxcpld. +config I2C_MUX_MULE + tristate "Theobroma Systems Mule I2C device multiplexer" + depends on OF && SENSORS_AMC6821 + help + Mule is an MCU that emulates a set of I2C devices, among which + devices that are reachable through an I2C-mux. The devices on the mux + can be selected by writing the appropriate device number to an I2C + configuration register. + + If you say yes to this option, support will be included for a + Theobroma Systems Mule I2C multiplexer. This driver provides access to + I2C devices connected on this mux. + + This driver can also be built as a module. If so, the module + will be called i2c-mux-mule. + endmenu diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile index 6d9d865e8518..4b24f49515a7 100644 --- a/drivers/i2c/muxes/Makefile +++ b/drivers/i2c/muxes/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o obj-$(CONFIG_I2C_MUX_GPMUX) += i2c-mux-gpmux.o obj-$(CONFIG_I2C_MUX_LTC4306) += i2c-mux-ltc4306.o obj-$(CONFIG_I2C_MUX_MLXCPLD) += i2c-mux-mlxcpld.o +obj-$(CONFIG_I2C_MUX_MULE) += i2c-mux-mule.o obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o obj-$(CONFIG_I2C_MUX_PINCTRL) += i2c-mux-pinctrl.o diff --git a/drivers/i2c/muxes/i2c-mux-mule.c b/drivers/i2c/muxes/i2c-mux-mule.c new file mode 100644 index 000000000000..e4e8992d4a09 --- /dev/null +++ b/drivers/i2c/muxes/i2c-mux-mule.c @@ -0,0 +1,148 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Theobroma Systems Mule I2C device multiplexer + * + * Copyright (C) 2024 Theobroma Systems Design und Consulting GmbH + */ + +#include +#include +#include +#include +#include +#include +#include + +#define MUX_CONFIG_REG 0xff +#define MUX_DEFAULT_DEV 0x0 + +struct mule_i2c_reg_mux { + struct regmap *regmap; +}; + +static int mux_select(struct i2c_mux_core *muxc, u32 dev) +{ + struct mule_i2c_reg_mux *mux = muxc->priv; + + return regmap_write(mux->regmap, MUX_CONFIG_REG, dev); +} + +static int mux_deselect(struct i2c_mux_core *muxc, u32 dev) +{ + return mux_select(muxc, MUX_DEFAULT_DEV); +} + +static void mux_remove(void *data) +{ + struct i2c_mux_core *muxc = data; + + i2c_mux_del_adapters(muxc); + + mux_deselect(muxc, MUX_DEFAULT_DEV); +} + +static int mule_i2c_mux_probe(struct platform_device *pdev) +{ + struct device *mux_dev = &pdev->dev; + struct mule_i2c_reg_mux *priv; + struct i2c_client *client; + struct i2c_mux_core *muxc; + struct device_node *dev; + unsigned int readback; + int ndev, ret; + bool old_fw; + + /* Count devices on the mux */ + ndev = of_get_child_count(mux_dev->of_node); + dev_dbg(mux_dev, "%d devices on the mux\n", ndev); + + client = to_i2c_client(mux_dev->parent); + + muxc = i2c_mux_alloc(client->adapter, mux_dev, ndev, sizeof(*priv), + I2C_MUX_LOCKED, mux_select, mux_deselect); + if (!muxc) + return -ENOMEM; + + priv = i2c_mux_priv(muxc); + + priv->regmap = dev_get_regmap(mux_dev->parent, NULL); + if (IS_ERR(priv->regmap)) + return dev_err_probe(mux_dev, PTR_ERR(priv->regmap), + "No parent i2c register map\n"); + + platform_set_drvdata(pdev, muxc); + + /* + * MUX_DEFAULT_DEV is guaranteed to exist on all old and new mule fw. + * mule fw without mux support will accept write ops to the + * config register, but readback returns 0xff (register not updated). + */ + ret = mux_select(muxc, MUX_DEFAULT_DEV); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to write config register\n"); + + ret = regmap_read(priv->regmap, MUX_CONFIG_REG, &readback); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to read config register\n"); + + old_fw = (readback != MUX_DEFAULT_DEV); + + ret = devm_add_action_or_reset(mux_dev, mux_remove, muxc); + if (ret) + return dev_err_probe(mux_dev, ret, + "Failed to register mux remove\n"); + + /* Create device adapters */ + for_each_child_of_node(mux_dev->of_node, dev) { + u32 reg; + + ret = of_property_read_u32(dev, "reg", ®); + if (ret) + return dev_err_probe(mux_dev, ret, + "No reg property found for %s\n", + of_node_full_name(dev)); + + if (old_fw && reg != 0) { + dev_warn(mux_dev, + "Mux is not supported, please update Mule FW\n"); + continue; + } + + ret = mux_select(muxc, reg); + if (ret) { + dev_warn(mux_dev, + "Device %d not supported, please update Mule FW\n", reg); + continue; + } + + ret = i2c_mux_add_adapter(muxc, 0, reg); + if (ret) + return ret; + } + + mux_deselect(muxc, MUX_DEFAULT_DEV); + + return 0; +} + +static const struct of_device_id mule_i2c_mux_of_match[] = { + {.compatible = "tsd,mule-i2c-mux",}, + {}, +}; +MODULE_DEVICE_TABLE(of, mule_i2c_mux_of_match); + +static struct platform_driver mule_i2c_mux_driver = { + .driver = { + .name = "mule-i2c-mux", + .of_match_table = mule_i2c_mux_of_match, + }, + .probe = mule_i2c_mux_probe, +}; + +module_platform_driver(mule_i2c_mux_driver); + +MODULE_AUTHOR("Farouk Bouabid "); +MODULE_DESCRIPTION("I2C mux driver for Theobroma Systems Mule"); +MODULE_LICENSE("GPL");