From patchwork Tue Jun 18 16:06:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Farouk Bouabid X-Patchwork-Id: 805453 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2123.outbound.protection.outlook.com [40.107.22.123]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AC0D252F74; Tue, 18 Jun 2024 16:09:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.22.123 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718726999; cv=fail; b=TGVsZK/756SeYsBao3uY/5eDlLWqp4MLW5byHnKOFhbkTza1NStr0zk1mnaGp+BER9z1wiB5cCS3lD/qyX8VbR3QfoqH2yWL6/mj5TXW5qY+dCbyIiWP/HZaq0817bdq0z7TWDabf4dZuQb76+Eq73yF4E4ub13r9TYjEFHQKU0= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718726999; c=relaxed/simple; bh=8l2URR3pIF6x05Xd/6FhcdJhOGXFxKSEmPT2xKP8XPU=; h=From:Date:Subject:Content-Type:Message-Id:References:In-Reply-To: To:Cc:MIME-Version; b=ljg82347w2HGXRFYWnZWfyLwEluldaeXwV2ANmOWCOTuDP3kM+p8nyb4GtMgi4+xyock6Gsqq9mIicZ38A5GVjAg6MqNb2KUofxXuqlqRWufRWTq0m9mS1nZnS1anERjWxpwZtICpqcA+s6T6Cn8rijIhHE/uu/u12xdBA1uWY0= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cherry.de; spf=pass smtp.mailfrom=cherry.de; dkim=pass (1024-bit key) header.d=cherry.de header.i=@cherry.de header.b=cpv5e8Vh; arc=fail smtp.client-ip=40.107.22.123 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=cherry.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cherry.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=cherry.de header.i=@cherry.de header.b="cpv5e8Vh" ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=XpnDsf6e8ytsU4iMTM+XfLNb1phE3OWHqMPLyPkl4ht4GKGYdQI12NGSZK/7Q5swgoa6EhYcqdmnCY6ooAd9YOuNZlGce6Bm2u79X9L93scFxdD8iIy1tUb3pDrV1hL53yX66/DUnYUQTorGYugLfVSfeZD7Dclcfu+U2OkUZEsv80RqvC3LcBrKiighICGYd+qOqxPz+EonE9LheauyEssHvTESsu9Pq/YEah7SYbQwD4btLVqdJygXzsX5QlmwLiHBgVK9ctyV44hTfjJniOnU6i75b6s6ChUzQ7ZPHj5HUbfwM3ZZJbIDA80aO3N9zH/QyKcz4NrhkF/7aTo/SA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=PnZwsozoI3H87NtXzhxmoYVOIrhnbDSoIu2s+sHSEGQ=; b=eXf1HMSWunStALSWGknylR88NjtkuGUKmg2IzFCozE004tDTIaNNmG0DoAvnUpkSszLlMxkYe+Zzt8mAC6HpUIv9p63XH2ezR0cfVbrl/Y51F7/YC7Xs41MQFJRiNNpFJ1q1uvKvUKSN3OALX/bxQ2x3wAgHnAEx4lo2I+CRSygA+4l0Z2DqjfepLsySuEvGDg3NCFH/A/bVsWYkuiqWAV+hmPvm9cWtihB+LM+C1HDbbCowfvEKF9cQjTWB35eLabhsdGC/Y6Xc38hH2khYRAIjot6oCfvoRymOPumUHYAsml2fh9E1vCsFZikWASLHVPjHbL40+MlEVe8uSwYGnA== 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=PnZwsozoI3H87NtXzhxmoYVOIrhnbDSoIu2s+sHSEGQ=; b=cpv5e8VhfKXwVKjftMoVJAHwmlLxbzTO9XkgZgFdGUtDRMDqrgAkGJK24C7PTkt+1IusAeojiGrk+PLadogfWjWPSwEysgsBL90t6sD3j5b0/d4x43ETQNwob2vr10pblrgA0mjOv0zTZFYgNAXi81MbbKFnFaYWf/RiiIluAFM= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=cherry.de; Received: from VE1PR04MB6382.eurprd04.prod.outlook.com (2603:10a6:803:122::31) by VI2PR04MB10642.eurprd04.prod.outlook.com (2603:10a6:800:27f::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7677.30; Tue, 18 Jun 2024 16:09:49 +0000 Received: from VE1PR04MB6382.eurprd04.prod.outlook.com ([fe80::2a24:328:711:5cd6]) by VE1PR04MB6382.eurprd04.prod.outlook.com ([fe80::2a24:328:711:5cd6%5]) with mapi id 15.20.7677.030; Tue, 18 Jun 2024 16:09:49 +0000 From: Farouk Bouabid Date: Tue, 18 Jun 2024 18:06:46 +0200 Subject: [PATCH v4 4/9] i2c: muxes: add support for mule i2c multiplexer Message-Id: <20240618-dev-mule-i2c-mux-v4-4-5462d28354c8@cherry.de> References: <20240618-dev-mule-i2c-mux-v4-0-5462d28354c8@cherry.de> In-Reply-To: <20240618-dev-mule-i2c-mux-v4-0-5462d28354c8@cherry.de> To: Jean Delvare , Guenter Roeck , Andi Shyti , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Lee Jones , Farouk Bouabid , Quentin Schulz , Peter Rosin , Heiko Stuebner Cc: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org X-Mailer: b4 0.14.0 X-ClientProxiedBy: VI1PR07CA0286.eurprd07.prod.outlook.com (2603:10a6:800:130::14) To VE1PR04MB6382.eurprd04.prod.outlook.com (2603:10a6:803:122::31) Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR04MB6382:EE_|VI2PR04MB10642:EE_ X-MS-Office365-Filtering-Correlation-Id: 3ebda858-c65e-4c4a-0c6d-08dc8fb11456 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230037|52116011|7416011|376011|366013|1800799021|38350700011|921017; X-Microsoft-Antispam-Message-Info: =?utf-8?q?b/XNLMIO+6Vwip0dBeLPhXyZErEgWqc?= =?utf-8?q?xs3m+Q8RoY8J6XsSlbeEPYZYhnTz0eRVfwTaDj2tewLrsg2X42Uo1/AsAh/uULjlO?= =?utf-8?q?6+Dr7vCa0AKv8jPO5j1DGXPlg7wLhwD+9cHTESla2YzMx2Y8Po0/D/tf3zK3mR0bN?= =?utf-8?q?m50no7ELJfbevAsTv0x2qiokZB+ogEIJ0bHIDydN9totTDrg8fQD7264jhamQCwnO?= =?utf-8?q?lSMzZYBULTJ5pWBfdEC0MqW/L2sib3EpvcwnfQ+WxYW4fmrxBk989ViG957PhP2e7?= =?utf-8?q?M4/xxvWe3f0Dy2JCoqWCXS9nOGlmQRapr6BA8HLso1D8mVtt7eCVgrajHwxxzMI0e?= =?utf-8?q?ENnPNIXGI/lQeqC8aiOsG/yIN7OoPr3SL8BZBorQ+QFqs9SOYd88zRQj4Rg+EcIqh?= =?utf-8?q?sQl0IvQchK3wtsFRFweznJUUP8OPajqvhUn6MLGW7naglGlm3qehdjDD2TdBsXS4V?= =?utf-8?q?pU11aBYs7Q8uLibcbdAzKIK1pk0Bq+HKiXaVQ59AeP0dM3cdqTgMlSPfE65bNxIZN?= =?utf-8?q?1TmtInivUqvgEMT1mYDSrIbU84A/6v71Xp/pOTWxJwcNoVQ/GMFeqn9mSIVvlx8Rk?= =?utf-8?q?f5cvLg0tMGvQRe3ngjagwbasIc78pjPyBalT0gCCLi8anXP38jDM4BvVzzLIfkZAX?= =?utf-8?q?Wtt3PrczagpKUrLgWZGj1/SNfGnbeNVdoM26j5NqBJtt36rILuqeEshBnaxoie10p?= =?utf-8?q?55G3F9AWab70HTvKGHRIFCVim8kd6UparNb5QVgV1F/a/jvz/Lek66aQAb1EJmVdl?= =?utf-8?q?FBlZiTdXogUU64z6N+fgT5nmoZFJ7shwukuHQSmFcKZ9Zlp75XwyuSWJpa7vyiii1?= =?utf-8?q?QOfN1vAtbrTvJA1zyx9Berx831eL6doHZlGVgZ99jo5qcl6Efi/OiqcWrxxg1kIqx?= =?utf-8?q?BrYEZ7N1YSS8pLLbn/wQyB/Eu+KGMVKa5o/FCPGzikP/PjZu9/xqu5u/TKcYxUhb+?= =?utf-8?q?T9i5VERtb+k702aom18Fcm6zF3NA87hTWEKoidsYvolacUktqsAUVfWR4ZtGQByTq?= =?utf-8?q?WLdKNZe3TsFjexWpL45QsKaE4vSzHwfxzh26cWBHbU6vF2HmaNYspSfxmW/KzDA8D?= =?utf-8?q?EIpc+h5BYlUnfxMp07QCSn0Wz9f6kVA6G418lCeF2+pXjoP7yJBAlKAP+PIGFsE8M?= =?utf-8?q?yWluIoH3aZ6thjDUg4uFYgMHzS1BFZ8PTJr9hBPpZI9hFf1cTvPZthHtKVAu8SFgd?= =?utf-8?q?vlCDTGm8RdcmACRHlupK5L68k0gwPLoa9IP3gi0iqgOMxmT+8zIajPmVbzOHcIfKj?= =?utf-8?q?admv6PJcHZ3bY2hBdVVeYaTFlCP4s0pbpZFz2bQhZRWO2uc/2G42cSUsilrONFbHC?= =?utf-8?q?eBAStDr5zCBF?= X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:VE1PR04MB6382.eurprd04.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230037)(52116011)(7416011)(376011)(366013)(1800799021)(38350700011)(921017); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?q?mkRT58t7yh7rnCyAos3mS+mpaTXU?= =?utf-8?q?gx1bMb0ArKZiU+3LyLEVNexNlcvfAVImgnf+YJ/yOEhGbgB8jGON6PIXFEJw2mogb?= =?utf-8?q?eFN6THOmfVmRBMd//rhGjSAN0OSdOyirl1jqonMaBljwg3evZQlIM/9Gg1fZCbeFx?= =?utf-8?q?XJk/Q+51Rxrfmg/sTnTIrhjcr+VqI9xcD1ETPYK9Ha7CzeirNfOW4G0Tymu5Fv3uP?= =?utf-8?q?ly5pNobRem9+apBAdi6PstKWWYXoe581Sj1N9WvQY43a58Z94OsoOiDTjVhoNQh8k?= =?utf-8?q?A+MseTahiq92upkOwoYOSLNQRO32iEm4YLey2UGL5VWMVGs5IR6hUFhGkIhycumxO?= =?utf-8?q?TgW/g6zJT6mKhXgTjPRnikXW4gWMUvra+0yh12DIWpI84Uxl4QzTnNbkiqBFq6BIY?= =?utf-8?q?3fSUCN3kT+ZACqI2K6PCvYkYxebL6AyYR9BFMCEQ61+wXf3TUKAhfHDgt/tfsbKDu?= =?utf-8?q?FpndYMfllPEAwTTH+dBrcUeT4FSdsLHJFb3l+xztbs2YWBQfXl9b+qm5ZMLHWiXJJ?= =?utf-8?q?T4eBf7Awh1Y6TZGGiR6pPKx9OjEPn7DkQPI+jBdZgp84fLgAYGVgCJzo7f+3yHfW0?= =?utf-8?q?E1s/pu/nh+Tf4pjiANYgrZ54uGWWWak11dfJ93dMemq56Vf6pPiWwZmZAbwicAYSo?= =?utf-8?q?ZANH6kwYj2KAciJboE4SOeqIPkkm45JMQcRvhmlqaMj9l5iN8OuNp9/dT8uBgwifa?= =?utf-8?q?ZBhexLRR54M/OxfKDSiTz8/K1pUowHs/S3k5lLuQRtk6pY96fNGPNI1y8oWclSSBO?= =?utf-8?q?OBZah3zB8dS2NqZ8fLvsP8CRMHIU6iyo+/Ebc7MHrEHXSIWhfUEDDEQFO1De1vwVk?= =?utf-8?q?xBK6wTJnAzHTQPS7l3YHkIVvkoT5ZjUACOiuEjHlH6MfBevX9XgMWWnlJD6U8cErW?= =?utf-8?q?M4D4f9utUh06UCrjoY370abgaGnQ3m6IKCMhYUZXRPAYAJbm6H6hcMBxyq1FOkMLZ?= =?utf-8?q?OTf2xwMcA/8mf5nUxpoX8wGNMYhNVooDFpAXZvcNmtMLOD0PeZCbEYe9UuqgNDdah?= =?utf-8?q?J7/k0tE3bOCJiPXDcoYu0AGnwnvILaz9cnW5AzshEdVi24gVj6e54ZBxmoB3pLnHk?= =?utf-8?q?++TZ0bNb0Y1+H7peVoOmEVLMiJb/xnCjRY2i12obuPBLYvTniByhYq1a+9bvC9UoT?= =?utf-8?q?3WzEC2fX7N+pAPMVSqvuFmmv9xSQmyibW3jdfvODxtibAl4Euxu5G5NWZktcRcT/+?= =?utf-8?q?V4nAX06TSxUuQDRG438xIawhGYng9LEkXgtDxwb+a9K4jKnX6tKWpr+/EEFUlAsDl?= =?utf-8?q?fc0YeEyHC/nTRuYDc4E1B9PFS107k28PI9JmLeUwEWDBPcHCTVo2mVL7TvXU7HS6E?= =?utf-8?q?cmz65I1evOZb2FqgOa3ME3dyNK8ziZTbxxHtHnsV+wjGngbYRqFtHoDlVgIWgl4Q6?= =?utf-8?q?y698x/EGMmdmDD0LRY1OtcNSZ0ZwiYOwNXJ1qSwOCp/fWx3vHMtzJqmEQ+vX176dz?= =?utf-8?q?kLJhuhjLCUyx8WHn58MJI+wVPyc2rT1lu7k9smPo5YJzJ9HX03+/uayhznrqu6wK4?= =?utf-8?q?PVkcc1CjXLIqU7JuLeagj2uH4Kq6DOlQbA=3D=3D?= X-OriginatorOrg: cherry.de X-MS-Exchange-CrossTenant-Network-Message-Id: 3ebda858-c65e-4c4a-0c6d-08dc8fb11456 X-MS-Exchange-CrossTenant-AuthSource: VE1PR04MB6382.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jun 2024 16:09:49.4913 (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: zRanaumrjH8pvLayHXDVSt+FZOlIN+nRlGHSxxLYAIjAJQpoLMqHmagBmUe+8prOQ9Ok3fdISFBCEevXl0n21dZQUNvwT3G1Xp1/AZW2eq8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI2PR04MB10642 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 config register. Signed-off-by: Farouk Bouabid --- drivers/i2c/muxes/Kconfig | 17 +++++ drivers/i2c/muxes/Makefile | 1 + drivers/i2c/muxes/i2c-mux-mule.c | 151 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 169 insertions(+) diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index db1b9057612a..e535cd9ea712 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -119,4 +119,21 @@ 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 "Mule I2C device multiplexer" + depends on OF + select MFD_SIMPLE_MFD_I2C + 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 config + register. + + If you say yes to this option, support will be included for a + Mule I2C device multiplexer. This driver provides access to + I2C devices connected on the Mule I2C 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..530403adea50 --- /dev/null +++ b/drivers/i2c/muxes/i2c-mux-mule.c @@ -0,0 +1,151 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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 inline int __mux_select(struct regmap *regmap, u32 dev) +{ + return regmap_write(regmap, MUX_CONFIG_REG, dev); +} + +static int mux_select(struct i2c_mux_core *muxc, u32 dev) +{ + struct mule_i2c_reg_mux *mux = muxc->priv; + + return __mux_select(mux->regmap, 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 ret; + + ret = regmap_read(priv->regmap, MUX_CONFIG_REG, &readback); + if (ret) + return ret; + + old_fw = (readback != MUX_DEFAULT_DEV); + + ret = devm_add_action_or_reset(mux_dev, mux_remove, muxc); + if (ret) + return ret; + + /* 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 dev_err_probe(mux_dev, ret, + "Failed to add i2c mux adapter %d\n", reg); + } + + 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 Mule"); +MODULE_LICENSE("GPL");