ACPI: Convert ACPI reference args to generic fwnode reference args

Convert all users of struct acpi_reference_args to more generic
fwnode_reference_args. This will

 1) avoid an ACPI specific references to device nodes with integer
    arguments as well as

 2) allow making references to nodes other than device nodes in ACPI.

As a by-product, convert the fwnode interger arguments to u64. The
arguments were 64-bit integers on ACPI but the fwnode arguments were
just 32-bit.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

9 files changed, 43 insertions, 55 deletions

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index 5815356ea6ad..3fa40010fd67 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -579,7 +579,7 @@ static int acpi_data_get_property_array(const struct acpi_device_data *data,
  */
 int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
         const char *propname, size_t index, size_t num_args,
-        struct acpi_reference_args *args)
+        struct fwnode_reference_args *args)
 {
         const union acpi_object *element, *end;
         const union acpi_object *obj;
@@ -607,7 +607,7 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
                 if (ret)
                         return ret == -ENODEV ? -EINVAL : ret;
 
-                args->adev = device;
+                args->fwnode = acpi_fwnode_handle(device);
                 args->nargs = 0;
                 return 0;
         }
@@ -653,11 +653,11 @@ int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
                                         return -EINVAL;
                         }
 
-                        if (nargs > MAX_ACPI_REFERENCE_ARGS)
+                        if (nargs > NR_FWNODE_REFERENCE_ARGS)
                                 return -EINVAL;
 
                         if (idx == index) {
-                                args->adev = device;
+                                args->fwnode = acpi_fwnode_handle(device);
                                 args->nargs = nargs;
                                 for (i = 0; i < nargs; i++)
                                         args->args[i] = element[i].integer.value;
@@ -1089,7 +1089,7 @@ int acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode,
 {
         struct fwnode_handle *fwnode;
         unsigned int port_nr, endpoint_nr;
-        struct acpi_reference_args args;
+        struct fwnode_reference_args args;
         int ret;
 
         memset(&args, 0, sizeof(args));
@@ -1098,6 +1098,10 @@ int acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode,
         if (ret)
                 return ret;
 
+        /* Ensure this is a device node. */
+        if (!is_acpi_device_node(args.fwnode))
+                return -ENODEV;
+
         /*
          * Always require two arguments with the reference: port and
          * endpoint indices.
@@ -1105,7 +1109,7 @@ int acpi_graph_get_remote_endpoint(const struct fwnode_handle *__fwnode,
         if (args.nargs != 2)
                 return -EPROTO;
 
-        fwnode = acpi_fwnode_handle(args.adev);
+        fwnode = args.fwnode;
         port_nr = args.args[0];
         endpoint_nr = args.args[1];
 
@@ -1209,24 +1213,8 @@ acpi_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
                                unsigned int args_count, unsigned int index,
                                struct fwnode_reference_args *args)
 {
-        struct acpi_reference_args acpi_args;
-        unsigned int i;
-        int ret;
-
-        ret = __acpi_node_get_property_reference(fwnode, prop, index,
-                                                 args_count, &acpi_args);
-        if (ret < 0)
-                return ret;
-        if (!args)
-                return 0;
-
-        args->nargs = acpi_args.nargs;
-        args->fwnode = acpi_fwnode_handle(acpi_args.adev);
-
-        for (i = 0; i < NR_FWNODE_REFERENCE_ARGS; i++)
-                args->args[i] = i < acpi_args.nargs ? acpi_args.args[i] : 0;
-
-        return 0;
+        return __acpi_node_get_property_reference(fwnode, prop, index,
+                                                  args_count, args);
 }
 
 static struct fwnode_handle *
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index e2232cbcec8b..4e8fdae1cde4 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -353,7 +353,7 @@ EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);
 
 static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
                                       const char *name, int index,
-                                      struct acpi_reference_args *args,
+                                      struct fwnode_reference_args *args,
                                       unsigned int *quirks)
 {
         const struct acpi_gpio_mapping *gm;
@@ -365,7 +365,7 @@ static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
                 if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
                         const struct acpi_gpio_params *par = gm->data + index;
 
-                        args->adev = adev;
+                        args->fwnode = acpi_fwnode_handle(adev);
                         args->args[0] = par->crs_entry_index;
                         args->args[1] = par->line_index;
                         args->args[2] = par->active_low;
@@ -528,7 +528,7 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
                                      const char *propname, int index,
                                      struct acpi_gpio_lookup *lookup)
 {
-        struct acpi_reference_args args;
+        struct fwnode_reference_args args;
         unsigned int quirks = 0;
         int ret;
 
@@ -549,6 +549,8 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
          * The property was found and resolved, so need to lookup the GPIO based
          * on returned args.
          */
+        if (!to_acpi_device_node(args.fwnode))
+                return -EINVAL;
         if (args.nargs != 3)
                 return -EPROTO;
 
@@ -556,8 +558,9 @@ static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
         lookup->pin_index = args.args[1];
         lookup->active_low = !!args.args[2];
 
-        lookup->info.adev = args.adev;
+        lookup->info.adev = to_acpi_device_node(args.fwnode);
         lookup->info.quirks = quirks;
+
         return 0;
 }
 
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index 8013d69c5ac4..8444234ed092 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -1435,7 +1435,7 @@ static int hns_roce_v1_reset(struct hns_roce_dev *hr_dev, bool dereset)
                 }
                 fwnode = &dsaf_node->fwnode;
         } else if (is_acpi_device_node(dev->fwnode)) {
-                struct acpi_reference_args args;
+                struct fwnode_reference_args args;
 
                 ret = acpi_node_get_property_reference(dev->fwnode,
                                                        "dsaf-handle", 0, &args);
@@ -1443,7 +1443,7 @@ static int hns_roce_v1_reset(struct hns_roce_dev *hr_dev, bool dereset)
                         dev_err(dev, "could not find dsaf-handle\n");
                         return ret;
                 }
-                fwnode = acpi_fwnode_handle(args.adev);
+                fwnode = args.fwnode;
         } else {
                 dev_err(dev, "cannot read data from DT or ACPI\n");
                 return -ENXIO;
@@ -4835,16 +4835,14 @@ static int hns_roce_get_cfg(struct hns_roce_dev *hr_dev)
                                 continue;
                         pdev = of_find_device_by_node(net_node);
                 } else if (is_acpi_device_node(dev->fwnode)) {
-                        struct acpi_reference_args args;
-                        struct fwnode_handle *fwnode;
+                        struct fwnode_reference_args args;
 
                         ret = acpi_node_get_property_reference(dev->fwnode,
                                                                "eth-handle",
                                                                i, &args);
                         if (ret)
                                 continue;
-                        fwnode = acpi_fwnode_handle(args.adev);
-                        pdev = hns_roce_find_pdev(fwnode);
+                        pdev = hns_roce_find_pdev(args.fwnode);
                 } else {
                         dev_err(dev, "cannot read data from DT or ACPI\n");
                         return -ENXIO;
diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index 3f77aa318035..82595cebc0b8 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -739,7 +739,7 @@ static struct fwnode_handle *v4l2_fwnode_reference_get_int_prop(
         const char * const *props, unsigned int nprops)
 {
         struct fwnode_reference_args fwnode_args;
-        unsigned int *args = fwnode_args.args;
+        u64 *args = fwnode_args.args;
         struct fwnode_handle *child;
         int ret;
 
diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
index 3188f553da35..078a04dc1182 100644
--- a/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
+++ b/drivers/net/ethernet/apm/xgene/xgene_enet_hw.c
@@ -836,19 +836,19 @@ static void xgene_enet_adjust_link(struct net_device *ndev)
 #ifdef CONFIG_ACPI
 static struct acpi_device *acpi_phy_find_device(struct device *dev)
 {
-        struct acpi_reference_args args;
+        struct fwnode_reference_args args;
         struct fwnode_handle *fw_node;
         int status;
 
         fw_node = acpi_fwnode_handle(ACPI_COMPANION(dev));
         status = acpi_node_get_property_reference(fw_node, "phy-handle", 0,
                                                   &args);
-        if (ACPI_FAILURE(status)) {
+        if (ACPI_FAILURE(status) || !is_acpi_device_node(args.fwnode)) {
                 dev_dbg(dev, "No matching phy in ACPI table\n");
                 return NULL;
         }
 
-        return args.adev;
+        return to_acpi_device_node(args.fwnode);
 }
 #endif
 
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c
index 9dcc5765f11f..794516718d9d 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c
@@ -708,7 +708,7 @@ hns_mac_register_phydev(struct mii_bus *mdio, struct hns_mac_cb *mac_cb,
 
 static int hns_mac_register_phy(struct hns_mac_cb *mac_cb)
 {
-        struct acpi_reference_args args;
+        struct fwnode_reference_args args;
         struct platform_device *pdev;
         struct mii_bus *mii_bus;
         int rc;
@@ -722,13 +722,15 @@ static int hns_mac_register_phy(struct hns_mac_cb *mac_cb)
                         mac_cb->fw_port, "mdio-node", 0, &args);
         if (rc)
                 return rc;
+        if (!is_acpi_device_node(args.fwnode))
+                return -EINVAL;
 
         addr = hns_mac_phy_parse_addr(mac_cb->dev, mac_cb->fw_port);
         if (addr < 0)
                 return addr;
 
         /* dev address in adev */
-        pdev = hns_dsaf_find_platform_device(acpi_fwnode_handle(args.adev));
+        pdev = hns_dsaf_find_platform_device(args.fwnode);
         if (!pdev) {
                 dev_err(mac_cb->dev, "mac%d mdio pdev is NULL\n",
                         mac_cb->mac_id);
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index ef9ef703d13a..5608f807d7ba 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -2377,7 +2377,7 @@ static int hns_nic_dev_probe(struct platform_device *pdev)
                 }
                 priv->fwnode = &ae_node->fwnode;
         } else if (is_acpi_node(dev->fwnode)) {
-                struct acpi_reference_args args;
+                struct fwnode_reference_args args;
 
                 if (acpi_dev_found(hns_enet_acpi_match[0].id))
                         priv->enet_ver = AE_VERSION_1;
@@ -2393,7 +2393,11 @@ static int hns_nic_dev_probe(struct platform_device *pdev)
                         dev_err(dev, "not find ae-handle\n");
                         goto out_read_prop_fail;
                 }
-                priv->fwnode = acpi_fwnode_handle(args.adev);
+                if (!is_acpi_device_node(args.fwnode)) {
+                        ret = -EINVAL;
+                        goto out_read_prop_fail;
+                }
+                priv->fwnode = args.fwnode;
         } else {
                 dev_err(dev, "cannot read cfg data from OF or acpi\n");
                 return -ENXIO;
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index e54f40974eb0..11cf39719fd8 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1058,27 +1058,20 @@ static inline int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
 
 /* Device properties */
 
-#define MAX_ACPI_REFERENCE_ARGS 8
-struct acpi_reference_args {
-        struct acpi_device *adev;
-        size_t nargs;
-        u64 args[MAX_ACPI_REFERENCE_ARGS];
-};
-
 #ifdef CONFIG_ACPI
 int acpi_dev_get_property(const struct acpi_device *adev, const char *name,
                           acpi_object_type type, const union acpi_object **obj);
 int __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
                                 const char *name, size_t index, size_t num_args,
-                                struct acpi_reference_args *args);
+                                struct fwnode_reference_args *args);
 
 static inline int acpi_node_get_property_reference(
                                 const struct fwnode_handle *fwnode,
                                 const char *name, size_t index,
-                                struct acpi_reference_args *args)
+                                struct fwnode_reference_args *args)
 {
         return __acpi_node_get_property_reference(fwnode, name, index,
-                MAX_ACPI_REFERENCE_ARGS, args);
+                NR_FWNODE_REFERENCE_ARGS, args);
 }
 
 int acpi_node_prop_get(const struct fwnode_handle *fwnode, const char *propname,
@@ -1169,7 +1162,7 @@ static inline int acpi_dev_get_property(struct acpi_device *adev,
 static inline int
 __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
                                 const char *name, size_t index, size_t num_args,
-                                struct acpi_reference_args *args)
+                                struct fwnode_reference_args *args)
 {
         return -ENXIO;
 }
@@ -1177,7 +1170,7 @@ __acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
 static inline int
 acpi_node_get_property_reference(const struct fwnode_handle *fwnode,
                                  const char *name, size_t index,
-                                 struct acpi_reference_args *args)
+                                 struct fwnode_reference_args *args)
 {
         return -ENXIO;
 }
diff --git a/include/linux/fwnode.h b/include/linux/fwnode.h
index 4fe8f289b3f6..faebf0ca0686 100644
--- a/include/linux/fwnode.h
+++ b/include/linux/fwnode.h
@@ -45,7 +45,7 @@ struct fwnode_endpoint {
 struct fwnode_reference_args {
         struct fwnode_handle *fwnode;
         unsigned int nargs;
-        unsigned int args[NR_FWNODE_REFERENCE_ARGS];
+        u64 args[NR_FWNODE_REFERENCE_ARGS];
 };
 
 /**