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97 lines
2.1 KiB
97 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* TPS68470 chip Parent driver |
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* |
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* Copyright (C) 2017 Intel Corporation |
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* |
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* Authors: |
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* Rajmohan Mani <[email protected]> |
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* Tianshu Qiu <[email protected]> |
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* Jian Xu Zheng <[email protected]> |
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* Yuning Pu <[email protected]> |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/delay.h> |
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#include <linux/i2c.h> |
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#include <linux/init.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/tps68470.h> |
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#include <linux/regmap.h> |
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static const struct mfd_cell tps68470s[] = { |
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{ .name = "tps68470-gpio" }, |
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{ .name = "tps68470_pmic_opregion" }, |
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}; |
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static const struct regmap_config tps68470_regmap_config = { |
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.reg_bits = 8, |
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.val_bits = 8, |
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.max_register = TPS68470_REG_MAX, |
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}; |
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static int tps68470_chip_init(struct device *dev, struct regmap *regmap) |
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{ |
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unsigned int version; |
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int ret; |
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/* Force software reset */ |
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ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK); |
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if (ret) |
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return ret; |
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ret = regmap_read(regmap, TPS68470_REG_REVID, &version); |
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if (ret) { |
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dev_err(dev, "Failed to read revision register: %d\n", ret); |
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return ret; |
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} |
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dev_info(dev, "TPS68470 REVID: 0x%x\n", version); |
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return 0; |
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} |
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static int tps68470_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct regmap *regmap; |
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int ret; |
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regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config); |
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if (IS_ERR(regmap)) { |
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dev_err(dev, "devm_regmap_init_i2c Error %ld\n", |
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PTR_ERR(regmap)); |
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return PTR_ERR(regmap); |
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} |
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i2c_set_clientdata(client, regmap); |
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ret = tps68470_chip_init(dev, regmap); |
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if (ret < 0) { |
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dev_err(dev, "TPS68470 Init Error %d\n", ret); |
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return ret; |
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} |
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ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s, |
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ARRAY_SIZE(tps68470s), NULL, 0, NULL); |
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if (ret < 0) { |
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dev_err(dev, "devm_mfd_add_devices failed: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static const struct acpi_device_id tps68470_acpi_ids[] = { |
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{"INT3472"}, |
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{}, |
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}; |
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static struct i2c_driver tps68470_driver = { |
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.driver = { |
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.name = "tps68470", |
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.acpi_match_table = tps68470_acpi_ids, |
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}, |
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.probe_new = tps68470_probe, |
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}; |
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builtin_i2c_driver(tps68470_driver);
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