drivers: Introduce device lookup variants by fwnode

Add a helper to match the firmware node handle of a device and provide
wrappers for {bus/class/driver}_find_device() APIs to avoid proliferation
of duplicate custom match functions.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-usb@vger.kernel.org
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Joe Perches <joe@perches.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20190723221838.12024-4-suzuki.poulose@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

12 files changed, 57 insertions, 63 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index fb83647d685a..e8f81a667545 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -3368,3 +3368,9 @@ int device_match_of_node(struct device *dev, const void *np)
         return dev->of_node == np;
 }
 EXPORT_SYMBOL_GPL(device_match_of_node);
+
+int device_match_fwnode(struct device *dev, const void *fwnode)
+{
+        return dev_fwnode(dev) == fwnode;
+}
+EXPORT_SYMBOL_GPL(device_match_fwnode);
diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
index 09f28479b243..1d488dc5dd0c 100644
--- a/drivers/base/devcon.c
+++ b/drivers/base/devcon.c
@@ -133,19 +133,13 @@ static struct bus_type *generic_match_buses[] = {
         NULL,
 };
 
-static int device_fwnode_match(struct device *dev, const void *fwnode)
-{
-        return dev_fwnode(dev) == fwnode;
-}
-
 static void *device_connection_fwnode_match(struct device_connection *con)
 {
         struct bus_type *bus;
         struct device *dev;
 
         for (bus = generic_match_buses[0]; bus; bus++) {
-                dev = bus_find_device(bus, NULL, (void *)con->fwnode,
-                                      device_fwnode_match);
+                dev = bus_find_device_by_fwnode(bus, con->fwnode);
                 if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id)))
                         return dev;
 
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index dad7d96c5943..3c5bee429105 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -37,11 +37,6 @@ static int coresight_alloc_conns(struct device *dev,
         return 0;
 }
 
-int coresight_device_fwnode_match(struct device *dev, const void *fwnode)
-{
-        return dev_fwnode(dev) == fwnode;
-}
-
 static struct device *
 coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
 {
@@ -51,8 +46,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
          * If we have a non-configurable replicator, it will be found on the
          * platform bus.
          */
-        dev = bus_find_device(&platform_bus_type, NULL,
-                              fwnode, coresight_device_fwnode_match);
+        dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
         if (dev)
                 return dev;
 
@@ -60,8 +54,7 @@ coresight_find_device_by_fwnode(struct fwnode_handle *fwnode)
          * We have a configurable component - circle through the AMBA bus
          * looking for the device that matches the endpoint node.
          */
-        return bus_find_device(&amba_bustype, NULL,
-                               fwnode, coresight_device_fwnode_match);
+        return bus_find_device_by_fwnode(&amba_bustype, fwnode);
 }
 
 #ifdef CONFIG_OF
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 7d401790dd7e..61d7f9ff054d 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -202,6 +202,4 @@ static inline void *coresight_get_uci_data(const struct amba_id *id)
 
 void coresight_release_platform_data(struct coresight_platform_data *pdata);
 
-int coresight_device_fwnode_match(struct device *dev, const void *fwnode);
-
 #endif
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c
index 55db77f6410b..6453c67a4d01 100644
--- a/drivers/hwtracing/coresight/coresight.c
+++ b/drivers/hwtracing/coresight/coresight.c
@@ -1046,9 +1046,7 @@ static void coresight_fixup_device_conns(struct coresight_device *csdev)
                 struct coresight_connection *conn = &csdev->pdata->conns[i];
                 struct device *dev = NULL;
 
-                dev = bus_find_device(&coresight_bustype, NULL,
-                                      (void *)conn->child_fwnode,
-                                      coresight_device_fwnode_match);
+                dev = bus_find_device_by_fwnode(&coresight_bustype, conn->child_fwnode);
                 if (dev) {
                         conn->child_dev = to_coresight_device(dev);
                         /* and put reference from 'bus_find_device()' */
diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
index 81e6dedb1e02..fa05e943038a 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hw_v1.c
@@ -4499,19 +4499,13 @@ static const struct acpi_device_id hns_roce_acpi_match[] = {
 };
 MODULE_DEVICE_TABLE(acpi, hns_roce_acpi_match);
 
-static int hns_roce_node_match(struct device *dev, const void *fwnode)
-{
-        return dev->fwnode == fwnode;
-}
-
 static struct
 platform_device *hns_roce_find_pdev(struct fwnode_handle *fwnode)
 {
         struct device *dev;
 
         /* get the 'device' corresponding to the matching 'fwnode' */
-        dev = bus_find_device(&platform_bus_type, NULL,
-                              fwnode, hns_roce_node_match);
+        dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
         /* get the platform device */
         return dev ? to_platform_device(dev) : NULL;
 }
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index a9a9fabd3968..6f0e13fa5e1a 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2034,16 +2034,11 @@ arm_smmu_iova_to_phys(struct iommu_domain *domain, dma_addr_t iova)
 
 static struct platform_driver arm_smmu_driver;
 
-static int arm_smmu_match_node(struct device *dev, const void *data)
-{
-        return dev->fwnode == data;
-}
-
 static
 struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
 {
-        struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
-                                                fwnode, arm_smmu_match_node);
+        struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
+                                                          fwnode);
         put_device(dev);
         return dev ? dev_get_drvdata(dev) : NULL;
 }
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 64977c131ee6..aa06498f291d 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1426,16 +1426,11 @@ static bool arm_smmu_capable(enum iommu_cap cap)
         }
 }
 
-static int arm_smmu_match_node(struct device *dev, const void *data)
-{
-        return dev->fwnode == data;
-}
-
 static
 struct arm_smmu_device *arm_smmu_get_by_fwnode(struct fwnode_handle *fwnode)
 {
-        struct device *dev = driver_find_device(&arm_smmu_driver.driver, NULL,
-                                                fwnode, arm_smmu_match_node);
+        struct device *dev = driver_find_device_by_fwnode(&arm_smmu_driver.driver,
+                                                          fwnode);
         put_device(dev);
         return dev ? dev_get_drvdata(dev) : NULL;
 }
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
index bb6586d0e5af..ed3829ae4ef1 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_misc.c
@@ -754,17 +754,11 @@ struct dsaf_misc_op *hns_misc_op_get(struct dsaf_device *dsaf_dev)
         return (void *)misc_op;
 }
 
-static int hns_dsaf_dev_match(struct device *dev, const void *fwnode)
-{
-        return dev->fwnode == fwnode;
-}
-
 struct
 platform_device *hns_dsaf_find_platform_device(struct fwnode_handle *fwnode)
 {
         struct device *dev;
 
-        dev = bus_find_device(&platform_bus_type, NULL,
-                              fwnode, hns_dsaf_dev_match);
+        dev = bus_find_device_by_fwnode(&platform_bus_type, fwnode);
         return dev ? to_platform_device(dev) : NULL;
 }
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index c8efe60e2465..0526efbc4922 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -85,11 +85,6 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw)
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_get_role);
 
-static int switch_fwnode_match(struct device *dev, const void *fwnode)
-{
-        return dev_fwnode(dev) == fwnode;
-}
-
 static void *usb_role_switch_match(struct device_connection *con, int ep,
                                    void *data)
 {
@@ -99,8 +94,7 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
                 if (con->id && !fwnode_property_present(con->fwnode, con->id))
                         return NULL;
 
-                dev = class_find_device(role_class, NULL, con->fwnode,
-                                        switch_fwnode_match);
+                dev = class_find_device_by_fwnode(role_class, con->fwnode);
         } else {
                 dev = class_find_device_by_name(role_class, con->endpoint[ep]);
         }
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index 9b0d15b487e5..94a3eda62add 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -205,11 +205,6 @@ static void typec_altmode_put_partner(struct altmode *altmode)
         put_device(&adev->dev);
 }
 
-static int typec_port_fwnode_match(struct device *dev, const void *fwnode)
-{
-        return dev_fwnode(dev) == fwnode;
-}
-
 static void *typec_port_match(struct device_connection *con, int ep, void *data)
 {
         struct device *dev;
@@ -219,8 +214,7 @@ static void *typec_port_match(struct device_connection *con, int ep, void *data)
          * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
          */
         if (con->fwnode)
-                return class_find_device(typec_class, NULL, con->fwnode,
-                                         typec_port_fwnode_match);
+                return class_find_device_by_fwnode(typec_class, con->fwnode);
 
         dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 29d8d7ad41e6..7133fc1c285d 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -166,6 +166,7 @@ void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
 
 int device_match_name(struct device *dev, const void *name);
 int device_match_of_node(struct device *dev, const void *np);
+int device_match_fwnode(struct device *dev, const void *fwnode);
 
 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
                      int (*fn)(struct device *dev, void *data));
@@ -198,6 +199,18 @@ bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
         return bus_find_device(bus, NULL, np, device_match_of_node);
 }
 
+/**
+ * bus_find_device_by_fwnode : device iterator for locating a particular device
+ * matching the fwnode.
+ * @bus: bus type
+ * @fwnode: fwnode of the device to match.
+ */
+static inline struct device *
+bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
+{
+        return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
+}
+
 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
                                         struct device *hint);
 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
@@ -391,6 +404,19 @@ driver_find_device_by_of_node(struct device_driver *drv,
         return driver_find_device(drv, NULL, np, device_match_of_node);
 }
 
+/**
+ * driver_find_device_by_fwnode- device iterator for locating a particular device
+ * by fwnode pointer.
+ * @driver: the driver we're iterating
+ * @fwnode: fwnode pointer to match.
+ */
+static inline struct device *
+driver_find_device_by_fwnode(struct device_driver *drv,
+                             const struct fwnode_handle *fwnode)
+{
+        return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
+}
+
 void driver_deferred_probe_add(struct device *dev);
 int driver_deferred_probe_check_state(struct device *dev);
 int driver_deferred_probe_check_state_continue(struct device *dev);
@@ -544,6 +570,19 @@ class_find_device_by_of_node(struct class *class, const struct device_node *np)
         return class_find_device(class, NULL, np, device_match_of_node);
 }
 
+/**
+ * class_find_device_by_fwnode : device iterator for locating a particular device
+ * matching the fwnode.
+ * @class: class type
+ * @fwnode: fwnode of the device to match.
+ */
+static inline struct device *
+class_find_device_by_fwnode(struct class *class,
+                            const struct fwnode_handle *fwnode)
+{
+        return class_find_device(class, NULL, fwnode, device_match_fwnode);
+}
+
 struct class_attribute {
         struct attribute attr;
         ssize_t (*show)(struct class *class, struct class_attribute *attr,