LXR linux/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 *              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
  22static const struct mfd_cell hi6421_devs[] = {
  23        { .name = "hi6421-regulator", },
  24};
  25
  26static const struct mfd_cell hi6421v530_devs[] = {
  27        { .name = "hi6421v530-regulator", },
  28};
  29
  30static 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
  37static 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};
  48MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
  49
  50static 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
 117static 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};
 124module_platform_driver(hi6421_pmic_driver);
 125
 126MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
 127MODULE_DESCRIPTION("Hi6421 PMIC driver");
 128MODULE_LICENSE("GPL v2");
 129