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Nguyen" Subject: [PATCH v7 8/9] mfd: smpro-mfd: Adds Ampere's Altra SMpro MFD driver Date: Mon, 21 Mar 2022 15:13:54 +0700 Message-Id: <20220321081355.6802-9-quan@os.amperecomputing.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220321081355.6802-1-quan@os.amperecomputing.com> References: <20220321081355.6802-1-quan@os.amperecomputing.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SGXP274CA0010.SGPP274.PROD.OUTLOOK.COM (2603:1096:4:b8::22) To SJ0PR01MB7282.prod.exchangelabs.com (2603:10b6:a03:3f2::24) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: cf88c586-c653-4bab-1733-08da0b12ee74 X-MS-TrafficTypeDiagnostic: SN6PR01MB4112:EE_ X-Microsoft-Antispam-PRVS: 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:SJ0PR01MB7282.prod.exchangelabs.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(5660300002)(508600001)(2616005)(26005)(107886003)(86362001)(8936002)(186003)(2906002)(1076003)(52116002)(7416002)(6666004)(6512007)(6506007)(921005)(38350700002)(38100700002)(110136005)(83380400001)(8676002)(66946007)(316002)(4326008)(66556008)(66476007)(6486002)(54906003);DIR:OUT;SFP:1102; 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Signed-off-by: Quan Nguyen --- Changes in v7: + Smpro-mfd now significant changes in compare with simple-mfd-i2c driver, remove the copyright note about simple-mfd-i2c [Quan] + Install bus->read/write() to handle multiple types of bus access. [Quan] + Update license to MODULE_LICENSE("GPL") [Quan] + Add others minor refactor the code [Quan] Changes in v6: + Update license part to reflect that this driver is clone from simple-mfd-i2c driver [Quan] Changes in v5: + Dropped the use of simple-mfd-i2c driver [Quan] + Introduced drivers/mfd/smpro-mfd.c driver to instantiate sub-devices. This is to avoid DT nodes without resource issue [Quan] + Revised commit message [Quan] Changes in v4: + Add "depends on I2C" to fix build issue found by kernel test robot [Guenter] Changes in v3: + None Changes in v2: + Used 'struct of_device_id's .data attribute [Lee Jones] drivers/mfd/Kconfig | 12 ++++ drivers/mfd/Makefile | 1 + drivers/mfd/smpro-mfd.c | 134 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 147 insertions(+) create mode 100644 drivers/mfd/smpro-mfd.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 3b59456f5545..383d0e6cfb91 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -77,6 +77,18 @@ config MFD_AS3711 help Support for the AS3711 PMIC from AMS +config MFD_SMPRO + tristate "Ampere Computing MFD SMpro core driver" + depends on I2C + select MFD_CORE + select REGMAP_I2C + help + Say yes here to enable SMpro driver support for Ampere's Altra + processor family. + + Ampere's Altra SMpro exposes an I2C regmap interface that can + be accessed by child devices. + config MFD_AS3722 tristate "ams AS3722 Power Management IC" select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 858cacf659d6..36f8981cc4fd 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -266,6 +266,7 @@ obj-$(CONFIG_MFD_QCOM_PM8008) += qcom-pm8008.o obj-$(CONFIG_SGI_MFD_IOC3) += ioc3.o obj-$(CONFIG_MFD_SIMPLE_MFD_I2C) += simple-mfd-i2c.o +obj-$(CONFIG_MFD_SMPRO) += smpro-mfd.o obj-$(CONFIG_MFD_INTEL_M10_BMC) += intel-m10-bmc.o obj-$(CONFIG_MFD_ATC260X) += atc260x-core.o diff --git a/drivers/mfd/smpro-mfd.c b/drivers/mfd/smpro-mfd.c new file mode 100644 index 000000000000..485c4f89ebd9 --- /dev/null +++ b/drivers/mfd/smpro-mfd.c @@ -0,0 +1,134 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Ampere Altra Family SMPro MFD - I2C + * + * Copyright (c) 2022, Ampere Computing LLC + * Author: Quan Nguyen + */ + +#include +#include +#include +#include +#include +#include + +/* Identification Registers */ +#define MANUFACTURER_ID_REG 0x02 +#define AMPERE_MANUFACTURER_ID 0xCD3A + +static int smpro_mfd_write(void *context, const void *data, size_t count) +{ + struct device *dev = context; + struct i2c_client *i2c = to_i2c_client(dev); + int ret; + + ret = i2c_master_send(i2c, data, count); + if (ret == count) + return 0; + else if (ret < 0) + return ret; + else + return -EIO; +} + +static int smpro_mfd_read(void *context, const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct device *dev = context; + struct i2c_client *i2c = to_i2c_client(dev); + struct i2c_msg xfer[2]; + unsigned char buf[2]; + int ret; + + xfer[0].addr = i2c->addr; + xfer[0].flags = 0; + + buf[0] = *(u8 *)reg; + buf[1] = val_size; + xfer[0].len = 2; + xfer[0].buf = buf; + + xfer[1].addr = i2c->addr; + xfer[1].flags = I2C_M_RD; + xfer[1].len = val_size; + xfer[1].buf = val; + + ret = i2c_transfer(i2c->adapter, xfer, 2); + if (ret == 2) + return 0; + else if (ret < 0) + return ret; + else + return -EIO; +} + +static const struct regmap_bus smpro_regmap_bus = { + .read = smpro_mfd_read, + .write = smpro_mfd_write, + .val_format_endian_default = REGMAP_ENDIAN_BIG, +}; + +static bool smpro_mfd_readable_noinc_reg(struct device *dev, unsigned int reg) +{ + return (reg == 0x82 || reg == 0x85 || reg == 0x92 || reg == 0x95 || + reg == 0xC2 || reg == 0xC5 || reg == 0xD2 || reg == 0xDA); +} + +static const struct regmap_config smpro_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + .readable_noinc_reg = smpro_mfd_readable_noinc_reg, +}; + +static const struct mfd_cell smpro_devs[] = { + MFD_CELL_NAME("smpro-hwmon"), + MFD_CELL_NAME("smpro-errmon"), + MFD_CELL_NAME("smpro-misc"), +}; + +static int smpro_mfd_probe(struct i2c_client *i2c) +{ + const struct regmap_config *config; + struct regmap *regmap; + unsigned int val; + int ret; + + config = device_get_match_data(&i2c->dev); + if (!config) + config = &smpro_regmap_config; + + regmap = devm_regmap_init(&i2c->dev, &smpro_regmap_bus, &i2c->dev, config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + /* Check for valid ID */ + ret = regmap_read(regmap, MANUFACTURER_ID_REG, &val); + if (ret) + return ret; + + if (val != AMPERE_MANUFACTURER_ID) + return -ENODEV; + + return devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, + smpro_devs, ARRAY_SIZE(smpro_devs), NULL, 0, NULL); +} + +static const struct of_device_id smpro_mfd_of_match[] = { + { .compatible = "ampere,smpro", .data = &smpro_regmap_config }, + {} +}; +MODULE_DEVICE_TABLE(of, smpro_mfd_of_match); + +static struct i2c_driver smpro_mfd_driver = { + .probe_new = smpro_mfd_probe, + .driver = { + .name = "smpro-mfd-i2c", + .of_match_table = smpro_mfd_of_match, + }, +}; +module_i2c_driver(smpro_mfd_driver); + +MODULE_AUTHOR("Quan Nguyen "); +MODULE_DESCRIPTION("SMPRO MFD - I2C driver"); +MODULE_LICENSE("GPL"); -- 2.35.1