1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/mfd/hi6421-pmic-core.c b/drivers/mfd/hi6421-pmic-core.c
new file mode 100644
index 000000000..eba88b80d
--- /dev/null
+++ b/drivers/mfd/hi6421-pmic-core.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Device driver for Hi6421 PMIC
+ *
+ * Copyright (c) <2011-2014> HiSilicon Technologies Co., Ltd.
+ *              http://www.hisilicon.com
+ * Copyright (c) <2013-2017> Linaro Ltd.
+ *              https://www.linaro.org
+ *
+ * Author: Guodong Xu <guodong.xu@linaro.org>
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/hi6421-pmic.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+static const struct mfd_cell hi6421_devs[] = {
+	{ .name = "hi6421-regulator", },
+};
+
+static const struct mfd_cell hi6421v530_devs[] = {
+	{ .name = "hi6421v530-regulator", },
+};
+
+static const struct regmap_config hi6421_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 8,
+	.max_register = HI6421_REG_TO_BUS_ADDR(HI6421_REG_MAX),
+};
+
+static const struct of_device_id of_hi6421_pmic_match[] = {
+	{
+		.compatible = "hisilicon,hi6421-pmic",
+		.data = (void *)HI6421
+	},
+	{
+		.compatible = "hisilicon,hi6421v530-pmic",
+		.data = (void *)HI6421_V530
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, of_hi6421_pmic_match);
+
+static int hi6421_pmic_probe(struct platform_device *pdev)
+{
+	struct hi6421_pmic *pmic;
+	struct resource *res;
+	const struct of_device_id *id;
+	const struct mfd_cell *subdevs;
+	enum hi6421_type type;
+	void __iomem *base;
+	int n_subdevs, ret;
+
+	id = of_match_device(of_hi6421_pmic_match, &pdev->dev);
+	if (!id)
+		return -EINVAL;
+	type = (enum hi6421_type)id->data;
+
+	pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
+	if (!pmic)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	pmic->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
+						 &hi6421_regmap_config);
+	if (IS_ERR(pmic->regmap)) {
+		dev_err(&pdev->dev, "Failed to initialise Regmap: %ld\n",
+						PTR_ERR(pmic->regmap));
+		return PTR_ERR(pmic->regmap);
+	}
+
+	platform_set_drvdata(pdev, pmic);
+
+	switch (type) {
+	case HI6421:
+		/* set over-current protection debounce 8ms */
+		regmap_update_bits(pmic->regmap, HI6421_OCP_DEB_CTRL_REG,
+				(HI6421_OCP_DEB_SEL_MASK
+				 | HI6421_OCP_EN_DEBOUNCE_MASK
+				 | HI6421_OCP_AUTO_STOP_MASK),
+				(HI6421_OCP_DEB_SEL_8MS
+				 | HI6421_OCP_EN_DEBOUNCE_ENABLE));
+
+		subdevs = hi6421_devs;
+		n_subdevs = ARRAY_SIZE(hi6421_devs);
+		break;
+	case HI6421_V530:
+		subdevs = hi6421v530_devs;
+		n_subdevs = ARRAY_SIZE(hi6421v530_devs);
+		break;
+	default:
+		dev_err(&pdev->dev, "Unknown device type %d\n",
+						(unsigned int)type);
+		return -EINVAL;
+	}
+
+	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+				   subdevs, n_subdevs, NULL, 0, NULL);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver hi6421_pmic_driver = {
+	.driver = {
+		.name = "hi6421_pmic",
+		.of_match_table = of_hi6421_pmic_match,
+	},
+	.probe	= hi6421_pmic_probe,
+};
+module_platform_driver(hi6421_pmic_driver);
+
+MODULE_AUTHOR("Guodong Xu <guodong.xu@linaro.org>");
+MODULE_DESCRIPTION("Hi6421 PMIC driver");
+MODULE_LICENSE("GPL v2");