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Miller" , Russell King , Heiner Kallweit , Andrew Lunn , Krzysztof Kozlowski , Rob Herring , Lee Jones , katie.morris@in-advantage.com, Jonathan Cameron , Dan Williams Subject: [PATCH v16 mfd 1/8] mfd: ocelot: add helper to get regmap from a resource Date: Sun, 14 Aug 2022 17:55:46 -0700 Message-Id: <20220815005553.1450359-2-colin.foster@in-advantage.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220815005553.1450359-1-colin.foster@in-advantage.com> References: <20220815005553.1450359-1-colin.foster@in-advantage.com> X-ClientProxiedBy: BYAPR08CA0034.namprd08.prod.outlook.com (2603:10b6:a03:100::47) To MWHPR1001MB2351.namprd10.prod.outlook.com (2603:10b6:301:35::37) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 71a607ad-ca60-439e-dbde-08da7e58ef56 X-MS-TrafficTypeDiagnostic: SN7PR10MB6286:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR1001MB2351.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230016)(39830400003)(366004)(136003)(396003)(346002)(376002)(38350700002)(5660300002)(7416002)(2906002)(44832011)(86362001)(38100700002)(52116002)(6666004)(41300700001)(6506007)(478600001)(2616005)(6486002)(186003)(316002)(1076003)(6512007)(26005)(83380400001)(8676002)(66556008)(66946007)(66476007)(4326008)(8936002)(54906003)(36756003);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: in-advantage.com X-MS-Exchange-CrossTenant-Network-Message-Id: 71a607ad-ca60-439e-dbde-08da7e58ef56 X-MS-Exchange-CrossTenant-AuthSource: MWHPR1001MB2351.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Aug 2022 00:56:06.5733 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 48e842ca-fbd8-4633-a79d-0c955a7d3aae X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: l7rHDy6P1Twbxh05XnBNFrtWFRaW3WYPSwkfOH4f/H86a+wvqJcOmE8aArhPHlpAT15KC3VYPS+pvUZjoFUlsyXLpSLIARg3zrCc1DhAvdc= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR10MB6286 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220814_175615_036941_C008D666 X-CRM114-Status: GOOD ( 21.45 ) 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 Several ocelot-related modules are designed for MMIO / regmaps. As such, they often use a combination of devm_platform_get_and_ioremap_resource() and devm_regmap_init_mmio(). Operating in an MFD might be different, in that it could be memory mapped, or it could be SPI, I2C... In these cases a fallback to use IORESOURCE_REG instead of IORESOURCE_MEM becomes necessary. When this happens, there's redundant logic that needs to be implemented in every driver. In order to avoid this redundancy, utilize a single function that, if the MFD scenario is enabled, will perform this fallback logic. Signed-off-by: Colin Foster Reviewed-by: Vladimir Oltean Reviewed-by: Andy Shevchenko --- v16 * Add Andy Reviewed-by tag v15 * Add missed errno.h and ioport.h includes * Add () to function references in both the commit log and comments v14 * Add header guard * Change regs type from u32* to void* * Add Reviewed-by tag --- MAINTAINERS | 5 +++ include/linux/mfd/ocelot.h | 62 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 67 insertions(+) create mode 100644 include/linux/mfd/ocelot.h diff --git a/MAINTAINERS b/MAINTAINERS index 8a5012ba6ff9..e0732e9f9090 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14741,6 +14741,11 @@ F: net/dsa/tag_ocelot.c F: net/dsa/tag_ocelot_8021q.c F: tools/testing/selftests/drivers/net/ocelot/* +OCELOT EXTERNAL SWITCH CONTROL +M: Colin Foster +S: Supported +F: include/linux/mfd/ocelot.h + OCXL (Open Coherent Accelerator Processor Interface OpenCAPI) DRIVER M: Frederic Barrat M: Andrew Donnellan diff --git a/include/linux/mfd/ocelot.h b/include/linux/mfd/ocelot.h new file mode 100644 index 000000000000..dd72073d2d4f --- /dev/null +++ b/include/linux/mfd/ocelot.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0 OR MIT */ +/* Copyright 2022 Innovative Advantage Inc. */ + +#ifndef _LINUX_MFD_OCELOT_H +#define _LINUX_MFD_OCELOT_H + +#include +#include +#include +#include +#include +#include + +struct resource; + +static inline struct regmap * +ocelot_regmap_from_resource_optional(struct platform_device *pdev, + unsigned int index, + const struct regmap_config *config) +{ + struct device *dev = &pdev->dev; + struct resource *res; + void __iomem *regs; + + /* + * Don't use _get_and_ioremap_resource() here, since that will invoke + * prints of "invalid resource" which will simply add confusion. + */ + res = platform_get_resource(pdev, IORESOURCE_MEM, index); + if (res) { + regs = devm_ioremap_resource(dev, res); + if (IS_ERR(regs)) + return ERR_CAST(regs); + return devm_regmap_init_mmio(dev, regs, config); + } + + /* + * Fall back to using REG and getting the resource from the parent + * device, which is possible in an MFD configuration + */ + if (dev->parent) { + res = platform_get_resource(pdev, IORESOURCE_REG, index); + if (!res) + return NULL; + + return dev_get_regmap(dev->parent, res->name); + } + + return NULL; +} + +static inline struct regmap * +ocelot_regmap_from_resource(struct platform_device *pdev, unsigned int index, + const struct regmap_config *config) +{ + struct regmap *map; + + map = ocelot_regmap_from_resource_optional(pdev, index, config); + return map ?: ERR_PTR(-ENOENT); +} + +#endif