netdev - [PATCH net-next 10/11] net: dsa: rzn1-a5psw: Add support for RZ/T2H Ethernet switch

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Message-ID: <20251121113553.2955854-11-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Fri, 21 Nov 2025 11:35:36 +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 10/11] net: dsa: rzn1-a5psw: Add support for RZ/T2H Ethernet switch

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

Add device tree match data and configuration for the Renesas RZ/T2H
SoC Ethernet switch. The RZ/T2H uses the same A5PSW switch IP as RZ/N1
but with four ports, the DSA tagging protocol `DSA_TAG_PROTO_RZT2H_ETHSW`,
and an additional 8-byte management port frame length adjustment.

This prepares the driver to handle RZ/T2H and compatible RZ/N2H
Ethernet switch instances.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/net/dsa/rzn1_a5psw.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/dsa/rzn1_a5psw.c b/drivers/net/dsa/rzn1_a5psw.c
index 82f4236a726e..9f85a4526bd2 100644
--- a/drivers/net/dsa/rzn1_a5psw.c
+++ b/drivers/net/dsa/rzn1_a5psw.c
@@ -1319,6 +1319,13 @@ static void a5psw_shutdown(struct platform_device *pdev)
 	platform_set_drvdata(pdev, NULL);
 }
 
+static const struct a5psw_of_data rzt2h_of_data = {
+	.nports = 4,
+	.cpu_port = 3,
+	.tag_proto = DSA_TAG_PROTO_RZT2H_ETHSW,
+	.management_port_frame_len_adj = 40,
+};
+
 static const struct a5psw_of_data rzn1_of_data = {
 	.nports = 5,
 	.cpu_port = 4,
@@ -1326,6 +1333,7 @@ static const struct a5psw_of_data rzn1_of_data = {
 };
 
 static const struct of_device_id a5psw_of_mtable[] = {
+	{ .compatible = "renesas,r9a09g077-ethsw", .data = &rzt2h_of_data },
 	{ .compatible = "renesas,rzn1-a5psw", .data = &rzn1_of_data },
 	{ /* sentinel */ },
 };
-- 
2.52.0