[PATCH] misc: fastrpc: Use of_reserved_mem_region_to_resource() for "memory-region"

["Rob Herring (Arm)" <robh@kernel.org>]

Use the newly added of_reserved_mem_region_to_resource() function to
handle "memory-region" properties.

The error handling is a bit different. "memory-region" is optional, so
failed lookup is not an error. But then an error in
of_reserved_mem_lookup() is treated as an error. However, that
distinction is not really important. Either the region is available
and usable or it is not. So now, it is just
of_reserved_mem_region_to_resource() which is checked for an error.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
---
 drivers/misc/fastrpc.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 378923594f02..53e88a1bc430 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -2262,8 +2262,6 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
 	int i, err, domain_id = -1, vmcount;
 	const char *domain;
 	bool secure_dsp;
-	struct device_node *rmem_node;
-	struct reserved_mem *rmem;
 	unsigned int vmids[FASTRPC_MAX_VMIDS];
 
 	err = of_property_read_string(rdev->of_node, "label", &domain);
@@ -2306,20 +2304,17 @@ static int fastrpc_rpmsg_probe(struct rpmsg_device *rpdev)
 		}
 	}
 
-	rmem_node = of_parse_phandle(rdev->of_node, "memory-region", 0);
-	if (domain_id == SDSP_DOMAIN_ID && rmem_node) {
+	if (domain_id == SDSP_DOMAIN_ID) {
+		struct resource res;
 		u64 src_perms;
 
-		rmem = of_reserved_mem_lookup(rmem_node);
-		if (!rmem) {
-			err = -EINVAL;
-			goto err_free_data;
-		}
+		err = of_reserved_mem_region_to_resource(rdev->of_node, 0, &res);
+		if (!err) {
+			src_perms = BIT(QCOM_SCM_VMID_HLOS);
 
-		src_perms = BIT(QCOM_SCM_VMID_HLOS);
-
-		qcom_scm_assign_mem(rmem->base, rmem->size, &src_perms,
+			qcom_scm_assign_mem(res.start, resource_size(&res), &src_perms,
 				    data->vmperms, data->vmcount);
+		}
 
 	}
 
-- 
2.47.2