132 lines
3.3 KiB
C
132 lines
3.3 KiB
C
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/*
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* Device driver for Hi6421 PMIC
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*
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* Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
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* http://www.hisilicon.com
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* Copyright (c) <2013-2017> Linaro Ltd.
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* http://www.linaro.org
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*
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* Author: Guodong Xu <guodong.xu@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/hi6421-pmic.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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static const struct mfd_cell hi6421_devs[] = {
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{ .name = "hi6421-regulator", },
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};
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static const struct mfd_cell hi6421v530_devs[] = {
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{ .name = "hi6421v530-regulator", },
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};
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static const struct regmap_config hi6421_regmap_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 8,
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.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
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};
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static const struct of_device_id of_hi6421_pmic_match[] = {
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{
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.compatible = "hisilicon,hi6421-pmic",
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.data = (void *)HI6421
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},
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{
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.compatible = "hisilicon,hi6421v530-pmic",
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.data = (void *)HI6421_V530
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
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static int hi6421_pmic_probe(struct platform_device *pdev)
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{
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struct hi6421_pmic *pmic;
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struct resource *res;
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const struct of_device_id *id;
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const struct mfd_cell *subdevs;
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enum hi6421_type type;
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void __iomem *base;
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int n_subdevs, ret;
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id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
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if (!id)
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return -EINVAL;
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type = (enum hi6421_type)id->data;
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pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
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if (!pmic)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
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&hi6421_regmap_config);
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if (IS_ERR(pmic->regmap)) {
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dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
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PTR_ERR(pmic->regmap));
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return PTR_ERR(pmic->regmap);
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}
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platform_set_drvdata(pdev, pmic);
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switch (type) {
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case HI6421:
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/* set over-current protection debounce 8ms */
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regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
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(HI6421_OCP_DEB_SEL_MASK
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| HI6421_OCP_EN_DEBOUNCE_MASK
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| HI6421_OCP_AUTO_STOP_MASK),
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(HI6421_OCP_DEB_SEL_8MS
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| HI6421_OCP_EN_DEBOUNCE_ENABLE));
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subdevs = hi6421_devs;
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n_subdevs = ARRAY_SIZE(hi6421_devs);
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break;
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case HI6421_V530:
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subdevs = hi6421v530_devs;
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n_subdevs = ARRAY_SIZE(hi6421v530_devs);
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break;
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default:
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dev_err(&pdev->dev, "Unknown device type %d\n",
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(unsigned int)type);
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return -EINVAL;
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}
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ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
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subdevs, n_subdevs, NULL, 0, NULL);
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if (ret) {
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dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static struct platform_driver hi6421_pmic_driver = {
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.driver = {
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.name = "hi6421_pmic",
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.of_match_table = of_hi6421_pmic_match,
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},
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.probe = hi6421_pmic_probe,
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};
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module_platform_driver(hi6421_pmic_driver);
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MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
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MODULE_DESCRIPTION("Hi6421 PMIC driver");
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MODULE_LICENSE("GPL v2");
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