1 /* 2 * Device driver for Hi6421 IC 3 * 4 * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd. 5 * http://www.hisilicon.com 6 * Copyright (c) <2013-2014> Linaro Ltd. 7 * http://www.linaro.org 8 * 9 * Author: Guodong Xu <guodong.xu@linaro.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope it will be useful, but WITHOUT 17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 19 * more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program. If not, see <http://www.gnu.org/licenses/>. 23 */ 24 25 #include <linux/device.h> 26 #include <linux/err.h> 27 #include <linux/mfd/core.h> 28 #include <linux/module.h> 29 #include <linux/of.h> 30 #include <linux/platform_device.h> 31 #include <linux/regmap.h> 32 #include <linux/mfd/hi6421-pmic.h> 33 34 static const struct mfd_cell hi6421_devs[] = { 35 { .name = "hi6421-regulator", }, 36 }; 37 38 static const struct regmap_config hi6421_regmap_config = { 39 .reg_bits = 32, 40 .reg_stride = 4, 41 .val_bits = 8, 42 .max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX), 43 }; 44 45 static int hi6421_pmic_probe(struct platform_device *pdev) 46 { 47 struct hi6421_pmic *pmic; 48 struct resource *res; 49 void __iomem *base; 50 int ret; 51 52 pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL); 53 if (!pmic) 54 return -ENOMEM; 55 56 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 57 base = devm_ioremap_resource(&pdev->dev, res); 58 if (IS_ERR(base)) 59 return PTR_ERR(base); 60 61 pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base, 62 &hi6421_regmap_config); 63 if (IS_ERR(pmic->regmap)) { 64 dev_err(&pdev->dev, 65 "regmap init failed: %ld\n", PTR_ERR(pmic->regmap)); 66 return PTR_ERR(pmic->regmap); 67 } 68 69 /* set over-current protection debounce 8ms */ 70 regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG, 71 (HI6421_OCP_DEB_SEL_MASK 72 | HI6421_OCP_EN_DEBOUNCE_MASK 73 | HI6421_OCP_AUTO_STOP_MASK), 74 (HI6421_OCP_DEB_SEL_8MS 75 | HI6421_OCP_EN_DEBOUNCE_ENABLE)); 76 77 platform_set_drvdata(pdev, pmic); 78 79 ret = mfd_add_devices(&pdev->dev, 0, hi6421_devs, 80 ARRAY_SIZE(hi6421_devs), NULL, 0, NULL); 81 if (ret) { 82 dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret); 83 return ret; 84 } 85 86 return 0; 87 } 88 89 static int hi6421_pmic_remove(struct platform_device *pdev) 90 { 91 mfd_remove_devices(&pdev->dev); 92 93 return 0; 94 } 95 96 static const struct of_device_id of_hi6421_pmic_match_tbl[] = { 97 { .compatible = "hisilicon,hi6421-pmic", }, 98 { }, 99 }; 100 101 static struct platform_driver hi6421_pmic_driver = { 102 .driver = { 103 .name = "hi6421_pmic", 104 .of_match_table = of_hi6421_pmic_match_tbl, 105 }, 106 .probe = hi6421_pmic_probe, 107 .remove = hi6421_pmic_remove, 108 }; 109 module_platform_driver(hi6421_pmic_driver); 110 111 MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>"); 112 MODULE_DESCRIPTION("Hi6421 PMIC driver"); 113 MODULE_LICENSE("GPL v2"); 114