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 * http://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 struct resource *res; 54 const struct of_device_id *id; 55 const struct mfd_cell *subdevs; 56 enum hi6421_type type; 57 void __iomem *base; 58 int n_subdevs, ret; 59 60 id = of_match_device(of_hi6421_pmic_match, &pdev->dev); 61 if (!id) 62 return -EINVAL; 63 type = (enum hi6421_type)id->data; 64 65 pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL); 66 if (!pmic) 67 return -ENOMEM; 68 69 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 70 base = devm_ioremap_resource(&pdev->dev, res); 71 if (IS_ERR(base)) 72 return PTR_ERR(base); 73 74 pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, 75 &hi6421_regmap_config); 76 if (IS_ERR(pmic->regmap)) { 77 dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n", 78 PTR_ERR(pmic->regmap)); 79 return PTR_ERR(pmic->regmap); 80 } 81 82 platform_set_drvdata(pdev, pmic); 83 84 switch (type) { 85 case HI6421: 86 /* set over-current protection debounce 8ms */ 87 regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG, 88 (HI6421_OCP_DEB_SEL_MASK 89 | HI6421_OCP_EN_DEBOUNCE_MASK 90 | HI6421_OCP_AUTO_STOP_MASK), 91 (HI6421_OCP_DEB_SEL_8MS 92 | HI6421_OCP_EN_DEBOUNCE_ENABLE)); 93 94 subdevs = hi6421_devs; 95 n_subdevs = ARRAY_SIZE(hi6421_devs); 96 break; 97 case HI6421_V530: 98 subdevs = hi6421v530_devs; 99 n_subdevs = ARRAY_SIZE(hi6421v530_devs); 100 break; 101 default: 102 dev_err(&pdev->dev, "Unknown device type %d\n", 103 (unsigned int)type); 104 return -EINVAL; 105 } 106 107 ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, 108 subdevs, n_subdevs, NULL, 0, NULL); 109 if (ret) { 110 dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret); 111 return ret; 112 } 113 114 return 0; 115 } 116 117 static struct platform_driver hi6421_pmic_driver = { 118 .driver = { 119 .name = "hi6421_pmic", 120 .of_match_table = of_hi6421_pmic_match, 121 }, 122 .probe = hi6421_pmic_probe, 123 }; 124 module_platform_driver(hi6421_pmic_driver); 125 126 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>"); 127 MODULE_DESCRIPTION("Hi6421 PMIC driver"); 128 MODULE_LICENSE("GPL v2"); 129