1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Device driver for Hi6421 PMIC 4 * 5 * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd. 6 * http://www.hisilicon.com 7 * Copyright (c) <2013-2017> Linaro Ltd. 8 * https://www.linaro.org 9 * 10 * Author: Guodong Xu <guodong.xu@linaro.org> 11 */ 12 13 #include <linux/device.h> 14 #include <linux/err.h> 15 #include <linux/mfd/core.h> 16 #include <linux/mfd/hi6421-pmic.h> 17 #include <linux/module.h> 18 #include <linux/of_device.h> 19 #include <linux/platform_device.h> 20 #include <linux/regmap.h> 21 22 static const struct mfd_cell hi6421_devs[] = { 23 { .name = "hi6421-regulator", }, 24 }; 25 26 static const struct mfd_cell hi6421v530_devs[] = { 27 { .name = "hi6421v530-regulator", }, 28 }; 29 30 static const struct regmap_config hi6421_regmap_config = { 31 .reg_bits = 32, 32 .reg_stride = 4, 33 .val_bits = 8, 34 .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX), 35 }; 36 37 static const struct of_device_id of_hi6421_pmic_match[] = { 38 { 39 .compatible = "hisilicon,hi6421-pmic", 40 .data = (void *)HI6421 41 }, 42 { 43 .compatible = "hisilicon,hi6421v530-pmic", 44 .data = (void *)HI6421_V530 45 }, 46 { }, 47 }; 48 MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match); 49 50 static int hi6421_pmic_probe(struct platform_device *pdev) 51 { 52 struct hi6421_pmic *pmic; 53 const struct of_device_id *id; 54 const struct mfd_cell *subdevs; 55 enum hi6421_type type; 56 void __iomem *base; 57 int n_subdevs, ret; 58 59 id = of_match_device(of_hi6421_pmic_match, &pdev->dev); 60 if (!id) 61 return -EINVAL; 62 type = (enum hi6421_type)id->data; 63 64 pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL); 65 if (!pmic) 66 return -ENOMEM; 67 68 base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL); 69 if (IS_ERR(base)) 70 return PTR_ERR(base); 71 72 pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, 73 &hi6421_regmap_config); 74 if (IS_ERR(pmic->regmap)) { 75 dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n", 76 PTR_ERR(pmic->regmap)); 77 return PTR_ERR(pmic->regmap); 78 } 79 80 platform_set_drvdata(pdev, pmic); 81 82 switch (type) { 83 case HI6421: 84 /* set over-current protection debounce 8ms */ 85 regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG, 86 (HI6421_OCP_DEB_SEL_MASK 87 | HI6421_OCP_EN_DEBOUNCE_MASK 88 | HI6421_OCP_AUTO_STOP_MASK), 89 (HI6421_OCP_DEB_SEL_8MS 90 | HI6421_OCP_EN_DEBOUNCE_ENABLE)); 91 92 subdevs = hi6421_devs; 93 n_subdevs = ARRAY_SIZE(hi6421_devs); 94 break; 95 case HI6421_V530: 96 subdevs = hi6421v530_devs; 97 n_subdevs = ARRAY_SIZE(hi6421v530_devs); 98 break; 99 default: 100 dev_err(&pdev->dev, "Unknown device type %d\n", 101 (unsigned int)type); 102 return -EINVAL; 103 } 104 105 ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, 106 subdevs, n_subdevs, NULL, 0, NULL); 107 if (ret) { 108 dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret); 109 return ret; 110 } 111 112 return 0; 113 } 114 115 static struct platform_driver hi6421_pmic_driver = { 116 .driver = { 117 .name = "hi6421_pmic", 118 .of_match_table = of_hi6421_pmic_match, 119 }, 120 .probe = hi6421_pmic_probe, 121 }; 122 module_platform_driver(hi6421_pmic_driver); 123 124 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>"); 125 MODULE_DESCRIPTION("Hi6421 PMIC driver"); 126 MODULE_LICENSE("GPL v2"); 127