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         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");