1 files changed, 153 insertions, 38 deletions

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index f5a73af60dd4..16d1861e9682 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -10,6 +10,7 @@
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/acpi.h>
+#include <linux/list.h>
 #include <linux/property.h>
 #include <linux/mfd/core.h>
 #include <linux/pm_runtime.h>
@@ -17,8 +18,17 @@
 #include <linux/module.h>
 #include <linux/irqdomain.h>
 #include <linux/of.h>
+#include <linux/of_address.h>
 #include <linux/regulator/consumer.h>
 
+static LIST_HEAD(mfd_of_node_list);
+
+struct mfd_of_node_entry {
+	struct list_head list;
+	struct device *dev;
+	struct device_node *np;
+};
+
 static struct device_type mfd_dev_type = {
 	.name	= "mfd_device",
 };
@@ -50,12 +60,29 @@ int mfd_cell_disable(struct platform_device *pdev)
 EXPORT_SYMBOL(mfd_cell_disable);
 
 #if IS_ENABLED(CONFIG_ACPI)
+struct match_ids_walk_data {
+	struct acpi_device_id *ids;
+	struct acpi_device *adev;
+};
+
+static int match_device_ids(struct acpi_device *adev, void *data)
+{
+	struct match_ids_walk_data *wd = data;
+
+	if (!acpi_match_device_ids(adev, wd->ids)) {
+		wd->adev = adev;
+		return 1;
+	}
+
+	return 0;
+}
+
 static void mfd_acpi_add_device(const struct mfd_cell *cell,
 				struct platform_device *pdev)
 {
 	const struct mfd_cell_acpi_match *match = cell->acpi_match;
-	struct acpi_device *parent, *child;
-	struct acpi_device *adev;
+	struct acpi_device *adev = NULL;
+	struct acpi_device *parent;
 
 	parent = ACPI_COMPANION(pdev->dev.parent);
 	if (!parent)
@@ -67,38 +94,26 @@ static void mfd_acpi_add_device(const struct mfd_cell *cell,
 	 * _ADR or it will use the parent handle if is no ID is given.
 	 *
 	 * Note that use of _ADR is a grey area in the ACPI specification,
-	 * though Intel Galileo Gen2 is using it to distinguish the children
-	 * devices.
+	 * though at least Intel Galileo Gen 2 is using it to distinguish
+	 * the children devices.
 	 */
-	adev = parent;
 	if (match) {
 		if (match->pnpid) {
 			struct acpi_device_id ids[2] = {};
-
-			strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
-			list_for_each_entry(child, &parent->children, node) {
-				if (!acpi_match_device_ids(child, ids)) {
-					adev = child;
-					break;
-				}
-			}
+			struct match_ids_walk_data wd = {
+				.adev = NULL,
+				.ids = ids,
+			};
+
+			strscpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
+			acpi_dev_for_each_child(parent, match_device_ids, &wd);
+			adev = wd.adev;
 		} else {
-			unsigned long long adr;
-			acpi_status status;
-
-			list_for_each_entry(child, &parent->children, node) {
-				status = acpi_evaluate_integer(child->handle,
-							       "_ADR", NULL,
-							       &adr);
-				if (ACPI_SUCCESS(status) && match->adr == adr) {
-					adev = child;
-					break;
-				}
-			}
+			adev = acpi_find_child_device(parent, match->adr, false);
 		}
 	}
 
-	ACPI_COMPANION_SET(&pdev->dev, adev);
+	ACPI_COMPANION_SET(&pdev->dev, adev ?: parent);
 }
 #else
 static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
@@ -107,6 +122,51 @@ static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
 }
 #endif
 
+static int mfd_match_of_node_to_dev(struct platform_device *pdev,
+				    struct device_node *np,
+				    const struct mfd_cell *cell)
+{
+#if IS_ENABLED(CONFIG_OF)
+	struct mfd_of_node_entry *of_entry;
+	const __be32 *reg;
+	u64 of_node_addr;
+
+	/* Skip if OF node has previously been allocated to a device */
+	list_for_each_entry(of_entry, &mfd_of_node_list, list)
+		if (of_entry->np == np)
+			return -EAGAIN;
+
+	if (!cell->use_of_reg)
+		/* No of_reg defined - allocate first free compatible match */
+		goto allocate_of_node;
+
+	/* We only care about each node's first defined address */
+	reg = of_get_address(np, 0, NULL, NULL);
+	if (!reg)
+		/* OF node does not contatin a 'reg' property to match to */
+		return -EAGAIN;
+
+	of_node_addr = of_read_number(reg, of_n_addr_cells(np));
+
+	if (cell->of_reg != of_node_addr)
+		/* No match */
+		return -EAGAIN;
+
+allocate_of_node:
+	of_entry = kzalloc(sizeof(*of_entry), GFP_KERNEL);
+	if (!of_entry)
+		return -ENOMEM;
+
+	of_entry->dev = &pdev->dev;
+	of_entry->np = np;
+	list_add_tail(&of_entry->list, &mfd_of_node_list);
+
+	pdev->dev.of_node = np;
+	pdev->dev.fwnode = &np->fwnode;
+#endif
+	return 0;
+}
+
 static int mfd_add_device(struct device *parent, int id,
 			  const struct mfd_cell *cell,
 			  struct resource *mem_base,
@@ -115,6 +175,7 @@ static int mfd_add_device(struct device *parent, int id,
 	struct resource *res;
 	struct platform_device *pdev;
 	struct device_node *np = NULL;
+	struct mfd_of_node_entry *of_entry, *tmp;
 	int ret = -ENOMEM;
 	int platform_id;
 	int r;
@@ -149,19 +210,30 @@ static int mfd_add_device(struct device *parent, int id,
 	if (ret < 0)
 		goto fail_res;
 
-	if (parent->of_node && cell->of_compatible) {
+	if (IS_ENABLED(CONFIG_OF) && parent->of_node && cell->of_compatible) {
 		for_each_child_of_node(parent->of_node, np) {
 			if (of_device_is_compatible(np, cell->of_compatible)) {
+				/* Ignore 'disabled' devices error free */
 				if (!of_device_is_available(np)) {
-					/* Ignore disabled devices error free */
+					of_node_put(np);
 					ret = 0;
 					goto fail_alias;
 				}
-				pdev->dev.of_node = np;
-				pdev->dev.fwnode = &np->fwnode;
+
+				ret = mfd_match_of_node_to_dev(pdev, np, cell);
+				if (ret == -EAGAIN)
+					continue;
+				of_node_put(np);
+				if (ret)
+					goto fail_alias;
+
 				break;
 			}
 		}
+
+		if (!pdev->dev.of_node)
+			pr_warn("%s: Failed to locate of_node [id: %d]\n",
+				cell->name, platform_id);
 	}
 
 	mfd_acpi_add_device(cell, pdev);
@@ -170,13 +242,13 @@ static int mfd_add_device(struct device *parent, int id,
 		ret = platform_device_add_data(pdev,
 					cell->platform_data, cell->pdata_size);
 		if (ret)
-			goto fail_alias;
+			goto fail_of_entry;
 	}
 
-	if (cell->properties) {
-		ret = platform_device_add_properties(pdev, cell->properties);
+	if (cell->swnode) {
+		ret = device_add_software_node(&pdev->dev, cell->swnode);
 		if (ret)
-			goto fail_alias;
+			goto fail_of_entry;
 	}
 
 	for (r = 0; r < cell->num_resources; r++) {
@@ -213,18 +285,18 @@ static int mfd_add_device(struct device *parent, int id,
 			if (has_acpi_companion(&pdev->dev)) {
 				ret = acpi_check_resource_conflict(&res[r]);
 				if (ret)
-					goto fail_alias;
+					goto fail_res_conflict;
 			}
 		}
 	}
 
 	ret = platform_device_add_resources(pdev, res, cell->num_resources);
 	if (ret)
-		goto fail_alias;
+		goto fail_res_conflict;
 
 	ret = platform_device_add(pdev);
 	if (ret)
-		goto fail_alias;
+		goto fail_res_conflict;
 
 	if (cell->pm_runtime_no_callbacks)
 		pm_runtime_no_callbacks(&pdev->dev);
@@ -233,6 +305,15 @@ static int mfd_add_device(struct device *parent, int id,
 
 	return 0;
 
+fail_res_conflict:
+	if (cell->swnode)
+		device_remove_software_node(&pdev->dev);
+fail_of_entry:
+	list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
+		if (of_entry->dev == &pdev->dev) {
+			list_del(&of_entry->list);
+			kfree(of_entry);
+		}
 fail_alias:
 	regulator_bulk_unregister_supply_alias(&pdev->dev,
 					       cell->parent_supplies,
@@ -287,6 +368,8 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
 {
 	struct platform_device *pdev;
 	const struct mfd_cell *cell;
+	struct mfd_of_node_entry *of_entry, *tmp;
+	int *level = data;
 
 	if (dev->type != &mfd_dev_type)
 		return 0;
@@ -294,6 +377,18 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
 	pdev = to_platform_device(dev);
 	cell = mfd_get_cell(pdev);
 
+	if (level && cell->level > *level)
+		return 0;
+
+	if (cell->swnode)
+		device_remove_software_node(&pdev->dev);
+
+	list_for_each_entry_safe(of_entry, tmp, &mfd_of_node_list, list)
+		if (of_entry->dev == &pdev->dev) {
+			list_del(&of_entry->list);
+			kfree(of_entry);
+		}
+
 	regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
 					       cell->num_parent_supplies);
 
@@ -301,9 +396,19 @@ static int mfd_remove_devices_fn(struct device *dev, void *data)
 	return 0;
 }
 
+void mfd_remove_devices_late(struct device *parent)
+{
+	int level = MFD_DEP_LEVEL_HIGH;
+
+	device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
+}
+EXPORT_SYMBOL(mfd_remove_devices_late);
+
 void mfd_remove_devices(struct device *parent)
 {
-	device_for_each_child_reverse(parent, NULL, mfd_remove_devices_fn);
+	int level = MFD_DEP_LEVEL_NORMAL;
+
+	device_for_each_child_reverse(parent, &level, mfd_remove_devices_fn);
 }
 EXPORT_SYMBOL(mfd_remove_devices);
 
@@ -318,6 +423,16 @@ static void devm_mfd_dev_release(struct device *dev, void *res)
  * Returns 0 on success or an appropriate negative error number on failure.
  * All child-devices of the MFD will automatically be removed when it gets
  * unbinded.
+ *
+ * @dev:	Pointer to parent device.
+ * @id:		Can be PLATFORM_DEVID_AUTO to let the Platform API take care
+ *		of device numbering, or will be added to a device's cell_id.
+ * @cells:	Array of (struct mfd_cell)s describing child devices.
+ * @n_devs:	Number of child devices to register.
+ * @mem_base:	Parent register range resource for child devices.
+ * @irq_base:	Base of the range of virtual interrupt numbers allocated for
+ *		this MFD device. Unused if @domain is specified.
+ * @domain:	Interrupt domain to create mappings for hardware interrupts.
  */
 int devm_mfd_add_devices(struct device *dev, int id,
 			 const struct mfd_cell *cells, int n_devs,