netdev - [PATCH net-next] net: phy: fixed: let fixed_phy_add always use addr 0 and remove return value

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Message-ID: <762700e5-a0b1-41af-aa03-929822a39475@gmail.com>
Date: Fri, 22 Aug 2025 22:36:11 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: Greg Ungerer <gerg@...ux-m68k.org>,
 Geert Uytterhoeven <geert@...ux-m68k.org>, Hauke Mehrtens
 <hauke@...ke-m.de>, Rafał Miłecki <zajec5@...il.com>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Andrew Lunn
 <andrew@...n.ch>, Andrew Lunn <andrew+netdev@...n.ch>,
 Russell King - ARM Linux <linux@...linux.org.uk>,
 Paolo Abeni <pabeni@...hat.com>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, David Miller <davem@...emloft.net>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
 linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org
Subject: [PATCH net-next] net: phy: fixed: let fixed_phy_add always use addr 0
 and remove return value

We have only two users of fixed_phy_add(), both use address 0 and
ignore the return value. So simplify fixed_phy_add() accordingly.

Whilst at it, constify the fixed_phy_status configs.

Note:
fixed_phy_add() is a legacy function which shouldn't be used in new
code, as it's use may be problematic:
- No check whether a fixed phy exists already at the given address
- If fixed_phy_register() is called afterwards by any other driver,
  then it will also use phy_addr 0, because fixed_phy_add() ignores
  the ida which manages address assignment
Drivers using a fixed phy created by fixed_phy_add() in platform code,
should dynamically create a fixed phy with fixed_phy_register()
instead.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 arch/m68k/coldfire/m5272.c  | 4 ++--
 arch/mips/bcm47xx/setup.c   | 4 ++--
 drivers/net/phy/fixed_phy.c | 4 ++--
 include/linux/phy_fixed.h   | 8 ++------
 4 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/arch/m68k/coldfire/m5272.c b/arch/m68k/coldfire/m5272.c
index 5b70dfdab..918e2a323 100644
--- a/arch/m68k/coldfire/m5272.c
+++ b/arch/m68k/coldfire/m5272.c
@@ -108,7 +108,7 @@ void __init config_BSP(char *commandp, int size)
  * an ethernet switch. In this case we need to use the fixed phy type,
  * and we need to declare it early in boot.
  */
-static struct fixed_phy_status nettel_fixed_phy_status __initdata = {
+static const struct fixed_phy_status nettel_fixed_phy_status __initconst = {
 	.link	= 1,
 	.speed	= 100,
 	.duplex	= 0,
@@ -119,7 +119,7 @@ static struct fixed_phy_status nettel_fixed_phy_status __initdata = {
 static int __init init_BSP(void)
 {
 	m5272_uarts_init();
-	fixed_phy_add(0, &nettel_fixed_phy_status);
+	fixed_phy_add(&nettel_fixed_phy_status);
 	clkdev_add_table(m5272_clk_lookup, ARRAY_SIZE(m5272_clk_lookup));
 	return 0;
 }
diff --git a/arch/mips/bcm47xx/setup.c b/arch/mips/bcm47xx/setup.c
index de426a474..a93a4266d 100644
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -256,7 +256,7 @@ static int __init bcm47xx_cpu_fixes(void)
 }
 arch_initcall(bcm47xx_cpu_fixes);
 
-static struct fixed_phy_status bcm47xx_fixed_phy_status __initdata = {
+static const struct fixed_phy_status bcm47xx_fixed_phy_status __initconst = {
 	.link	= 1,
 	.speed	= SPEED_100,
 	.duplex	= DUPLEX_FULL,
@@ -282,7 +282,7 @@ static int __init bcm47xx_register_bus_complete(void)
 	bcm47xx_leds_register();
 	bcm47xx_workarounds();
 
-	fixed_phy_add(0, &bcm47xx_fixed_phy_status);
+	fixed_phy_add(&bcm47xx_fixed_phy_status);
 	return 0;
 }
 device_initcall(bcm47xx_register_bus_complete);
diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
index 7902b35c5..b39532abf 100644
--- a/drivers/net/phy/fixed_phy.c
+++ b/drivers/net/phy/fixed_phy.c
@@ -153,9 +153,9 @@ static int fixed_phy_add_gpiod(unsigned int irq, int phy_addr,
 	return 0;
 }
 
-int fixed_phy_add(int phy_addr, const struct fixed_phy_status *status)
+void fixed_phy_add(const struct fixed_phy_status *status)
 {
-	return fixed_phy_add_gpiod(PHY_POLL, phy_addr, status, NULL);
+	fixed_phy_add_gpiod(PHY_POLL, 0, status, NULL);
 }
 EXPORT_SYMBOL_GPL(fixed_phy_add);
 
diff --git a/include/linux/phy_fixed.h b/include/linux/phy_fixed.h
index 5399b9e41..6227a1bde 100644
--- a/include/linux/phy_fixed.h
+++ b/include/linux/phy_fixed.h
@@ -17,7 +17,7 @@ struct net_device;
 
 #if IS_ENABLED(CONFIG_FIXED_PHY)
 extern int fixed_phy_change_carrier(struct net_device *dev, bool new_carrier);
-int fixed_phy_add(int phy_id, const struct fixed_phy_status *status);
+void fixed_phy_add(const struct fixed_phy_status *status);
 struct phy_device *fixed_phy_register(const struct fixed_phy_status *status,
 				      struct device_node *np);
 
@@ -26,11 +26,7 @@ extern int fixed_phy_set_link_update(struct phy_device *phydev,
 			int (*link_update)(struct net_device *,
 					   struct fixed_phy_status *));
 #else
-static inline int fixed_phy_add(int phy_id,
-				const struct fixed_phy_status *status)
-{
-	return -ENODEV;
-}
+static inline void fixed_phy_add(const struct fixed_phy_status *status) {}
 static inline struct phy_device *
 fixed_phy_register(const struct fixed_phy_status *status,
 		   struct device_node *np)
-- 
2.50.1