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, 11 insertions, 13 deletions

diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_wcnss.c
index c109096bbfe3..af42517fde08 100644
--- a/drivers/remoteproc/qcom_wcnss.c
+++ b/drivers/remoteproc/qcom_wcnss.c
@@ -15,7 +15,7 @@
 #include <linux/module.h>
 #include <linux/io.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
+#include <linux/of_reserved_mem.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
@@ -506,27 +506,25 @@ static int wcnss_request_irq(struct qcom_wcnss *wcnss,
 
 static int wcnss_alloc_memory_region(struct qcom_wcnss *wcnss)
 {
+	struct reserved_mem *rmem = NULL;
 	struct device_node *node;
-	struct resource r;
-	int ret;
 
 	node = of_parse_phandle(wcnss->dev->of_node, "memory-region", 0);
-	if (!node) {
-		dev_err(wcnss->dev, "no memory-region specified\n");
+	if (node)
+		rmem = of_reserved_mem_lookup(node);
+	of_node_put(node);
+
+	if (!rmem) {
+		dev_err(wcnss->dev, "unable to resolve memory-region\n");
 		return -EINVAL;
 	}
 
-	ret = of_address_to_resource(node, 0, &r);
-	of_node_put(node);
-	if (ret)
-		return ret;
-
-	wcnss->mem_phys = wcnss->mem_reloc = r.start;
-	wcnss->mem_size = resource_size(&r);
+	wcnss->mem_phys = wcnss->mem_reloc = rmem->base;
+	wcnss->mem_size = rmem->size;
 	wcnss->mem_region = devm_ioremap_wc(wcnss->dev, wcnss->mem_phys, wcnss->mem_size);
 	if (!wcnss->mem_region) {
 		dev_err(wcnss->dev, "unable to map memory region: %pa+%zx\n",
-			&r.start, wcnss->mem_size);
+			&rmem->base, wcnss->mem_size);
 		return -EBUSY;
 	}