of: Add convenience wrappers for of_map_id()

Since we now have quite a few users parsing "iommu-map" and "msi-map"
properties, give them some wrappers to conveniently encapsulate the
appropriate sets of property names. This will also make it easier to
then change of_map_id() to correctly account for specifier cells.

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Vijayanand Jitta <vijayanand.jitta@oss.qualcomm.com>
Link: https://patch.msgid.link/20260603-parse_iommu_cells-v16-1-dc509dacb19a@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/include/linux/of.h b/include/linux/of.h
index 959786f8f196..721525334b4b 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -468,6 +468,12 @@ int of_map_id(const struct device_node *np, u32 id,
 	       const char *map_name, const char *map_mask_name,
 	       struct device_node **target, u32 *id_out);
 
+int of_map_iommu_id(const struct device_node *np, u32 id,
+		    struct device_node **target, u32 *id_out);
+
+int of_map_msi_id(const struct device_node *np, u32 id,
+		  struct device_node **target, u32 *id_out);
+
 phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
 
 struct kimage;
@@ -948,6 +954,18 @@ static inline int of_map_id(const struct device_node *np, u32 id,
 	return -EINVAL;
 }
 
+static inline int of_map_iommu_id(const struct device_node *np, u32 id,
+				  struct device_node **target, u32 *id_out)
+{
+	return -EINVAL;
+}
+
+static inline int of_map_msi_id(const struct device_node *np, u32 id,
+				struct device_node **target, u32 *id_out)
+{
+	return -EINVAL;
+}
+
 static inline phys_addr_t of_dma_get_max_cpu_address(struct device_node *np)
 {
 	return PHYS_ADDR_MAX;