drivers/mfd/hi6421-pmic-core.c

   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");