[PATCH net-next 08/10] net: ethernet: mtk_wed: move dlm a dedicated dts node

[Lorenzo Bianconi]

Since the dlm memory region is not part of the RAM SoC, move dlm in a
deidicated syscon node.
This patch helps to keep backward-compatibility with older version of
uboot codebase where we have a limit of 8 reserved-memory dts child
nodes.
Keep backward-compatibility with older dts version where dlm was defined
as reserved-memory child node.

Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
 drivers/net/ethernet/mediatek/mtk_wed.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index 95d890870984..e479ff924ed6 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -799,6 +799,24 @@ mtk_wed_rro_alloc(struct mtk_wed_device *dev)
 	struct device_node *np;
 	int index;
 
+	np = of_parse_phandle(dev->hw->node, "mediatek,wo-dlm", 0);
+	if (np) {
+		struct resource res;
+		int ret;
+
+		ret = of_address_to_resource(np, 0, &res);
+		of_node_put(np);
+
+		if (ret < 0)
+			return ret;
+
+		dev->rro.miod_phys = res.start;
+		goto out;
+	}
+
+	/* For backward compatibility, we need to check if DLM
+	 * node is defined through reserved memory property.
+	 */
 	index = of_property_match_string(dev->hw->node, "memory-region-names",
 					 "wo-dlm");
 	if (index < 0)
@@ -815,6 +833,7 @@ mtk_wed_rro_alloc(struct mtk_wed_device *dev)
 		return -ENODEV;
 
 	dev->rro.miod_phys = rmem->base;
+out:
 	dev->rro.fdbk_phys = MTK_WED_MIOD_COUNT + dev->rro.miod_phys;
 
 	return mtk_wed_rro_ring_alloc(dev, &dev->rro.ring,
-- 
2.39.2