remoteproc: qcom: Use of_reserved_mem_lookup()

Reserved memory can be either looked up using the generic function
of_address_to_resource() or using the special of_reserved_mem_lookup().
The latter has the advantage that it ensures that the referenced memory
region was really reserved and is not e.g. status = "disabled".

of_reserved_mem also supports allocating reserved memory dynamically at
boot time. This works only when using of_reserved_mem_lookup() since
there won't be a fixed address in the device tree.

Switch the code to use of_reserved_mem_lookup(), similar to
qcom_q6v5_wcss.c which is using it already. There is no functional
difference for static reserved memory allocations.

While at it this also adds two missing of_node_put() calls in
qcom_q6v5_pas.c.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Tested-by: Caleb Connolly <caleb.connolly@linaro.org> # SDM845
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20230710-rproc-of-rmem-v3-1-eea7f0a33590@gerhold.net
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

1 files changed, 20 insertions, 13 deletions

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 76c546871a94..6e333c5e65a9 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -16,7 +16,6 @@
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
@@ -1876,8 +1875,6 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc)
 	struct device_node *child;
 	struct reserved_mem *rmem;
 	struct device_node *node;
-	struct resource r;
-	int ret;
 
 	/*
 	 * In the absence of mba/mpss sub-child, extract the mba and mpss
@@ -1892,15 +1889,20 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc)
 		of_node_put(child);
 	}
 
-	ret = of_address_to_resource(node, 0, &r);
+	if (!node) {
+		dev_err(qproc->dev, "no mba memory-region specified\n");
+		return -EINVAL;
+	}
+
+	rmem = of_reserved_mem_lookup(node);
 	of_node_put(node);
-	if (ret) {
+	if (!rmem) {
 		dev_err(qproc->dev, "unable to resolve mba region\n");
-		return ret;
+		return -EINVAL;
 	}
 
-	qproc->mba_phys = r.start;
-	qproc->mba_size = resource_size(&r);
+	qproc->mba_phys = rmem->base;
+	qproc->mba_size = rmem->size;
 
 	if (!child) {
 		node = of_parse_phandle(qproc->dev->of_node,
@@ -1911,15 +1913,20 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc)
 		of_node_put(child);
 	}
 
-	ret = of_address_to_resource(node, 0, &r);
+	if (!node) {
+		dev_err(qproc->dev, "no mpss memory-region specified\n");
+		return -EINVAL;
+	}
+
+	rmem = of_reserved_mem_lookup(node);
 	of_node_put(node);
-	if (ret) {
+	if (!rmem) {
 		dev_err(qproc->dev, "unable to resolve mpss region\n");
-		return ret;
+		return -EINVAL;
 	}
 
-	qproc->mpss_phys = qproc->mpss_reloc = r.start;
-	qproc->mpss_size = resource_size(&r);
+	qproc->mpss_phys = qproc->mpss_reloc = rmem->base;
+	qproc->mpss_size = rmem->size;
 
 	if (!child) {
 		node = of_parse_phandle(qproc->dev->of_node, "memory-region", 2);