Eric Lee / smarc-fsl-linux-kernel

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drivers/mfd/tps68470.c 2.11 KB
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37c089d1f   Rajmohan Mani   mfd: Update to SP... 
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  // SPDX-License-Identifier: GPL-2.0
9bbf6a15c   Rajmohan Mani   mfd: Add support ... 
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  /*
   * TPS68470 chip Parent driver
   *
   * Copyright (C) 2017 Intel Corporation
   *
   * Authors:
   *	Rajmohan Mani <rajmohan.mani@intel.com>
   *	Tianshu Qiu <tian.shu.qiu@intel.com>
   *	Jian Xu Zheng <jian.xu.zheng@intel.com>
   *	Yuning Pu <yuning.pu@intel.com>
9bbf6a15c   Rajmohan Mani   mfd: Add support ... 
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   */
  
  #include <linux/acpi.h>
  #include <linux/delay.h>
  #include <linux/i2c.h>
  #include <linux/init.h>
  #include <linux/mfd/core.h>
  #include <linux/mfd/tps68470.h>
  #include <linux/regmap.h>
  
  static const struct mfd_cell tps68470s[] = {
  	{ .name = "tps68470-gpio" },
  	{ .name = "tps68470_pmic_opregion" },
  };
  
  static const struct regmap_config tps68470_regmap_config = {
  	.reg_bits = 8,
  	.val_bits = 8,
  	.max_register = TPS68470_REG_MAX,
  };
  
  static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
  {
  	unsigned int version;
  	int ret;
  
  	/* Force software reset */
  	ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK);
  	if (ret)
  		return ret;
  
  	ret = regmap_read(regmap, TPS68470_REG_REVID, &version);
  	if (ret) {
  		dev_err(dev, "Failed to read revision register: %d
  ", ret);
  		return ret;
  	}
  
  	dev_info(dev, "TPS68470 REVID: 0x%x
  ", version);
  
  	return 0;
  }
  
  static int tps68470_probe(struct i2c_client *client)
  {
  	struct device *dev = &client->dev;
  	struct regmap *regmap;
  	int ret;
  
  	regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config);
  	if (IS_ERR(regmap)) {
  		dev_err(dev, "devm_regmap_init_i2c Error %ld
  ",
  			PTR_ERR(regmap));
  		return PTR_ERR(regmap);
  	}
  
  	i2c_set_clientdata(client, regmap);
  
  	ret = tps68470_chip_init(dev, regmap);
  	if (ret < 0) {
  		dev_err(dev, "TPS68470 Init Error %d
  ", ret);
  		return ret;
  	}
  
  	ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s,
  			      ARRAY_SIZE(tps68470s), NULL, 0, NULL);
  	if (ret < 0) {
  		dev_err(dev, "devm_mfd_add_devices failed: %d
  ", ret);
  		return ret;
  	}
  
  	return 0;
  }
  
  static const struct acpi_device_id tps68470_acpi_ids[] = {
  	{"INT3472"},
  	{},
  };
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  static struct i2c_driver tps68470_driver = {
  	.driver = {
  		   .name = "tps68470",
  		   .acpi_match_table = tps68470_acpi_ids,
  	},
  	.probe_new = tps68470_probe,
  };
  builtin_i2c_driver(tps68470_driver);