linux-kernel - [PATCH v2 1/5] of/platform: Generalize /reserved-memory handling

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Date:   Wed,  2 Aug 2017 19:57:50 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>
Cc:     Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org
Subject: [PATCH v2 1/5] of/platform: Generalize /reserved-memory handling

By iterating over all /reserved-memory child nodes and match each one to
a list of compatibles that we want to treat specially, we can easily
extend the list of compatibles to handle - without having to resort to
of_platform_populate() that would create unnecessary platform_devices.

Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Changes since v1:
- New patch

 drivers/of/platform.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index b19524623498..8c241a116b08 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -497,23 +497,32 @@ int of_platform_default_populate(struct device_node *root,
 EXPORT_SYMBOL_GPL(of_platform_default_populate);
 
 #ifndef CONFIG_PPC
+static const char *rmem_compats[] = {
+	"ramoops",
+	NULL
+};
+
 static int __init of_platform_default_populate_init(void)
 {
+	struct device_node *rmem_nodes;
 	struct device_node *node;
+	int ret;
 
 	if (!of_have_populated_dt())
 		return -ENODEV;
 
 	/*
-	 * Handle ramoops explicitly, since it is inside /reserved-memory,
-	 * which lacks a "compatible" property.
+	 * Handle certain compatibles explicitly, since we don't want to create
+	 * platform_devices for every node in /reserved-memory with a
+	 * "compatible",
 	 */
-	node = of_find_node_by_path("/reserved-memory");
-	if (node) {
-		node = of_find_compatible_node(node, NULL, "ramoops");
-		if (node)
+	rmem_nodes = of_find_node_by_path("/reserved-memory");
+	for_each_available_child_of_node(rmem_nodes, node) {
+		ret = of_device_compatible_match(node, rmem_compats);
+		if (ret)
 			of_platform_device_create(node, NULL, NULL);
 	}
+	of_node_put(rmem_nodes);
 
 	/* Populate everything else. */
 	of_platform_default_populate(NULL, NULL, NULL);
-- 
2.12.0