[PATCH v3 17/22] net: tsec: Support <reg> property from the subnode "queue-group"

[Bin Meng]

At present the tsec driver uses a non-standard DT bindings to get
its <reg> base / size. The upstream Linux kernel seems to require
the <reg> base / size to be put under a subnode of the eTSEC node
with a name prefix "queue-group". This is not documented in the
kernel DT bindings, but it looks every dtsi file that contains the
eTSEC node was written like this.

This commit updates the tsec driver to handle this case.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
Reviewed-by: Ramon Fried <rfried.dev at gmail.com>

---

Changes in v3:
- keep the variable definitions sorted
- invert the strncmp logic to reduce the indentation level
- add a comment to mention only the first "queue-group" is used
- call the same map_physmem() in the common code path

 drivers/net/tsec.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/net/tsec.c b/drivers/net/tsec.c
index 491d2ef1ae..c68e4b7fb5 100644
--- a/drivers/net/tsec.c
+++ b/drivers/net/tsec.c
@@ -826,15 +826,39 @@ int tsec_probe(struct udevice *dev)
 	u32 tbiaddr = CONFIG_SYS_TBIPA_VALUE;
 	struct tsec_data *data;
 	const char *phy_mode;
+	ofnode parent, child;
 	fdt_addr_t reg;
-	ofnode parent;
 	int ret;
 
 	data = (struct tsec_data *)dev_get_driver_data(dev);
 
 	pdata->iobase = (phys_addr_t)dev_read_addr(dev);
-	if (pdata->iobase == FDT_ADDR_T_NONE)
-		return -ENOENT;
+	if (pdata->iobase == FDT_ADDR_T_NONE) {
+		ofnode_for_each_subnode(child, dev_ofnode(dev)) {
+			if (strncmp(ofnode_get_name(child), "queue-group",
+				    strlen("queue-group")))
+				continue;
+
+			reg = ofnode_get_addr(child);
+			if (reg == FDT_ADDR_T_NONE) {
+				printf("No 'reg' property of <queue-group>\n");
+				return -ENOENT;
+			}
+			pdata->iobase = reg;
+
+			/*
+			 * if there are multiple queue groups,
+			 * only the first one is used.
+			 */
+			break;
+		}
+
+		if (!ofnode_valid(child)) {
+			printf("No child node for <queue-group>?\n");
+			return -ENOENT;
+		}
+	}
+
 	priv->regs = map_physmem(pdata->iobase, 0, MAP_NOCACHE);
 
 	ret = dev_read_phandle_with_args(dev, "tbi-handle", NULL, 0, 0,
-- 
2.25.1