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.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");