Re: [PATCH v9 3/5] mfd: hi6421-spmi-pmic: move driver from staging

+static int hi6421_spmi_pmic_probe(struct spmi_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+	struct hi6421_spmi_pmic *ddata;
+	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);

+	if (!ddata)
+		return -ENOMEM;
+
+	ddata->regmap = devm_regmap_init_spmi_ext(pdev, &regmap_config);
+	if (IS_ERR(ddata->regmap))
+		return PTR_ERR(ddata->regmap);
+
+	mutex_init(&ddata->enable_mutex);
+
+	dev_set_drvdata(&pdev->dev, ddata);
+
+	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+				   hi6421v600_devs, ARRAY_SIZE(hi6421v600_devs),
+				   NULL, 0, NULL);
+	if (ret < 0)
+		dev_err(dev, "Failed to add child devices: %d\n", ret);
+
+	return ret;
+}