linux-kernel - [PATCH net-next 08/11] net: dsa: rzn1-a5psw: Make DSA tag protocol configurable via OF data

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Message-ID: <20251121113553.2955854-9-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 21 Nov 2025 11:35:34 +0000
From: Prabhakar <prabhakar.csengg@...il.com>
To: Clément Léger <clement.leger@...tlin.com>,
	Andrew Lunn <andrew@...n.ch>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Simon Horman <horms@...nel.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Russell King <linux@...linux.org.uk>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>
Cc: linux-renesas-soc@...r.kernel.org,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH net-next 08/11] net: dsa: rzn1-a5psw: Make DSA tag protocol configurable via OF data

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Update the RZN1 A5PSW driver to obtain the DSA tag protocol from
device-specific data instead of using a hard-coded value. Add a new
`tag_proto` field to `struct a5psw_of_data` and use it in
`a5psw_get_tag_protocol()` to return the appropriate protocol for
each SoC.

This allows future SoCs such as RZ/T2H and RZ/N2H, which use the
DSA_TAG_PROTO_RZT2H_ETHSW tag format, to share the same driver
infrastructure without code duplication.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/net/dsa/rzn1_a5psw.c | 5 ++++-
 drivers/net/dsa/rzn1_a5psw.h | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/rzn1_a5psw.c b/drivers/net/dsa/rzn1_a5psw.c
index d957b6d40f05..dc42a409eaef 100644
--- a/drivers/net/dsa/rzn1_a5psw.c
+++ b/drivers/net/dsa/rzn1_a5psw.c
@@ -97,7 +97,9 @@ static enum dsa_tag_protocol a5psw_get_tag_protocol(struct dsa_switch *ds,
 						    int port,
 						    enum dsa_tag_protocol mp)
 {
-	return DSA_TAG_PROTO_RZN1_A5PSW;
+	struct a5psw *a5psw = ds->priv;
+
+	return a5psw->of_data->tag_proto;
 }
 
 static void a5psw_port_pattern_set(struct a5psw *a5psw, int port, int pattern,
@@ -1316,6 +1318,7 @@ static void a5psw_shutdown(struct platform_device *pdev)
 static const struct a5psw_of_data rzn1_of_data = {
 	.nports = 5,
 	.cpu_port = 4,
+	.tag_proto = DSA_TAG_PROTO_RZN1_A5PSW,
 };
 
 static const struct of_device_id a5psw_of_mtable[] = {
diff --git a/drivers/net/dsa/rzn1_a5psw.h b/drivers/net/dsa/rzn1_a5psw.h
index d1b2cc5b43e6..0fef32451e4f 100644
--- a/drivers/net/dsa/rzn1_a5psw.h
+++ b/drivers/net/dsa/rzn1_a5psw.h
@@ -234,10 +234,12 @@ union lk_data {
  * struct a5psw_of_data - OF data structure
  * @nports: Number of ports in the switch
  * @cpu_port: CPU port number
+ * @tag_proto: DSA tag protocol used by the switch
  */
 struct a5psw_of_data {
 	unsigned int nports;
 	unsigned int cpu_port;
+	enum dsa_tag_protocol tag_proto;
 };
 
 /**
-- 
2.52.0