staging: mfd: hi6421-spmi-pmic: change the binding logic

Change the binding logic to ensure that the MFD driver
will be load after having the SPMI controller registered.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/eb50392ce68bb30f64c603572cdb9c91f93ea47b.1597647359.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hikey9xx/hi6421-spmi-pmic.c

@@ -24,13 +24,14 @@
 #include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
+#include <linux/mfd/core.h>
 #include <linux/platform_device.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/of_gpio.h>
 #include <linux/of_irq.h>
-#include <linux/mfd/hisi_pmic.h>
+#include <linux/mfd/hi6421-spmi-pmic.h>
 #include <linux/irq.h>
 #include <linux/spmi.h>
 #ifndef NO_IRQ
@@ -53,11 +54,8 @@
 /*define the first group interrupt register number*/
 #define HISI_PMIC_FIRST_GROUP_INT_NUM        2
 
-static const struct of_device_id of_hisi_pmic_match_tbl[] = {
-	{
-		.compatible = "hisilicon-hisi-pmic-spmi",
-	},
-	{ /* end */ }
+static const struct mfd_cell hi6421v600_devs[] = {
+	{ .name = "hi6421v600-regulator", },
 };
 
 /*
@@ -477,6 +475,22 @@ static int hisi_pmic_probe(struct spmi_device *pdev)
 		goto request_theaded_irq;
 	}
 
+	dev_set_drvdata(&pdev->dev, pmic);
+
+	/*
+	 * The logic below will rely that the pmic is already stored at
+	 * drvdata.
+	 */
+	dev_dbg(&pdev->dev, "SPMI-PMIC: adding childs for %pOF\n",
+		pdev->dev.of_node);
+	ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
+				   hi6421v600_devs, ARRAY_SIZE(hi6421v600_devs),
+				   NULL, 0, NULL);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to add child devices: %d\n", ret);
+		return ret;
+	}
+
 after_irq_register:
 	return 0;
 
@@ -497,61 +511,21 @@ static void hisi_pmic_remove(struct spmi_device *pdev)
 	devm_kfree(&pdev->dev, pmic);
 }
 
-static int hisi_pmic_suspend(struct device *dev, pm_message_t state)
-{
-	struct hisi_pmic *pmic = dev_get_drvdata(dev);
-
-	if (!pmic) {
-		pr_err("%s:pmic is NULL\n", __func__);
-		return -ENOMEM;
-	}
-
-	pr_info("%s:+\n", __func__);
-	pr_info("%s:-\n", __func__);
-
-	return 0;
-}
-
-static int hisi_pmic_resume(struct device *dev)
-{
-	struct hisi_pmic *pmic = dev_get_drvdata(dev);
-
-	if (!pmic) {
-		pr_err("%s:pmic is NULL\n", __func__);
-		return -ENOMEM;
-	}
-
-	pr_info("%s:+\n", __func__);
-	pr_info("%s:-\n", __func__);
-
-	return 0;
-}
+static const struct of_device_id pmic_spmi_id_table[] = {
+	{ .compatible = "hisilicon,hi6421-spmi-pmic" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
 
-MODULE_DEVICE_TABLE(spmi, pmic_spmi_id);
 static struct spmi_driver hisi_pmic_driver = {
 	.driver = {
-		.name	= "hisi_pmic",
-		.owner  = THIS_MODULE,
-		.of_match_table = of_hisi_pmic_match_tbl,
-		.suspend = hisi_pmic_suspend,
-		.resume = hisi_pmic_resume,
+		.name	= "hi6421-spmi-pmic",
+		.of_match_table = pmic_spmi_id_table,
 	},
 	.probe	= hisi_pmic_probe,
 	.remove	= hisi_pmic_remove,
 };
+module_spmi_driver(hisi_pmic_driver);
 
-static int __init hisi_pmic_init(void)
-{
-	return spmi_driver_register(&hisi_pmic_driver);
-}
-
-static void __exit hisi_pmic_exit(void)
-{
-	spmi_driver_unregister(&hisi_pmic_driver);
-}
-
-subsys_initcall_sync(hisi_pmic_init);
-module_exit(hisi_pmic_exit);
-
-MODULE_DESCRIPTION("PMIC driver");
+MODULE_DESCRIPTION("HiSilicon Hi6421v600 SPMI PMIC driver");
 MODULE_LICENSE("GPL v2");