linux-kernel - [PATCH RFC net-next 05/23] net: dsa: lantiq_gswip: introduce bitmaps for port types

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Message-ID: <aKDhXWIjk3VYYTQh@pidgin.makrotopia.org>
Date: Sat, 16 Aug 2025 20:51:57 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: 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>,
	Hauke Mehrtens <hauke@...ke-m.de>, Simon Horman <horms@...nel.org>,
	Russell King <linux@...linux.org.uk>,
	Florian Fainelli <f.fainelli@...il.com>,
	Arkadi Sharshevsky <arkadis@...lanox.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc: Andreas Schirm <andreas.schirm@...mens.com>,
	Lukas Stockmann <lukas.stockmann@...mens.com>,
	Alexander Sverdlin <alexander.sverdlin@...mens.com>,
	Peter Christen <peter.christen@...mens.com>,
	Avinash Jayaraman <ajayaraman@...linear.com>,
	Bing tao Xu <bxu@...linear.com>, Liang Xu <lxu@...linear.com>,
	Juraj Povazanec <jpovazanec@...linear.com>,
	"Fanni (Fang-Yi) Chan" <fchan@...linear.com>,
	"Benny (Ying-Tsan) Weng" <yweng@...linear.com>,
	"Livia M. Rosu" <lrosu@...linear.com>,
	John Crispin <john@...ozen.org>
Subject: [PATCH RFC net-next 05/23] net: dsa: lantiq_gswip: introduce bitmaps
 for port types

Instead of relying on hard-coded numbers for MII ports, introduce
bitmaps for ports with either built-in PHYs, MII or SGMII.
This is done in order to prepare for supporting MaxLinear GSW1xx ICs
which got a different layout of ports, and also support SGMII.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/net/dsa/lantiq_gswip.c | 15 ++++++++++++---
 drivers/net/dsa/lantiq_gswip.h |  3 +++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 5a8fb358fb59..86e02ac0c221 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -185,14 +185,19 @@ static void gswip_mii_mask(struct gswip_priv *priv, u32 clear, u32 set,
 static void gswip_mii_mask_cfg(struct gswip_priv *priv, u32 clear, u32 set,
 			       int port)
 {
-	/* There's no MII_CFG register for the CPU port */
-	if (!dsa_is_cpu_port(priv->ds, port))
-		gswip_mii_mask(priv, clear, set, GSWIP_MII_CFGp(port));
+	if (!(priv->hw_info->mii_ports & BIT(port)))
+		return;
+
+	/* MII_CFG register only exists for MII ports */
+	gswip_mii_mask(priv, clear, set, GSWIP_MII_CFGp(port));
 }
 
 static void gswip_mii_mask_pcdu(struct gswip_priv *priv, u32 clear, u32 set,
 				int port)
 {
+	if (!(priv->hw_info->mii_ports & BIT(port)))
+		return;
+
 	switch (port) {
 	case 0:
 		gswip_mii_mask(priv, clear, set, GSWIP_MII_PCDU0);
@@ -2003,12 +2008,16 @@ static void gswip_shutdown(struct platform_device *pdev)
 static const struct gswip_hw_info gswip_xrx200 = {
 	.max_ports = 7,
 	.allowed_cpu_ports = BIT(6),
+	.phy_ports = BIT(2) | BIT(3) | BIT(4) | BIT(5),
+	.mii_ports = BIT(0) | BIT(5),
 	.phylink_get_caps = gswip_xrx200_phylink_get_caps,
 };
 
 static const struct gswip_hw_info gswip_xrx300 = {
 	.max_ports = 7,
 	.allowed_cpu_ports = BIT(6),
+	.phy_ports = BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(5),
+	.mii_ports = BIT(0) | BIT(1) | BIT(5),
 	.phylink_get_caps = gswip_xrx300_phylink_get_caps,
 };
 
diff --git a/drivers/net/dsa/lantiq_gswip.h b/drivers/net/dsa/lantiq_gswip.h
index c90ddf89d0d7..3b19963f2073 100644
--- a/drivers/net/dsa/lantiq_gswip.h
+++ b/drivers/net/dsa/lantiq_gswip.h
@@ -217,6 +217,9 @@
 struct gswip_hw_info {
 	int max_ports;
 	unsigned int allowed_cpu_ports;
+	unsigned int phy_ports;
+	unsigned int mii_ports;
+	unsigned int sgmii_ports;
 	void (*phylink_get_caps)(struct dsa_switch *ds, int port,
 				 struct phylink_config *config);
 };
-- 
2.50.1