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