add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/phy/broadcom.c
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@@ -404,6 +404,17 @@
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 	return bcm54xx_config_init(phydev);
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 }
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+static int bcm54810_read_mmd(struct phy_device *phydev, int devnum, u16 regnum)
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+{
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+	return -EOPNOTSUPP;
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+}
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+
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+static int bcm54810_write_mmd(struct phy_device *phydev, int devnum, u16 regnum,
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+			      u16 val)
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+{
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+	return -EOPNOTSUPP;
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+}
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+
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 static int bcm54811_config_init(struct phy_device *phydev)
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 {
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 	int err, reg;
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@@ -841,6 +852,8 @@
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 	.phy_id_mask    = 0xfffffff0,
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 	.name           = "Broadcom BCM54810",
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 	/* PHY_GBIT_FEATURES */
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+	.read_mmd	= bcm54810_read_mmd,
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+	.write_mmd	= bcm54810_write_mmd,
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 	.config_init    = bcm54xx_config_init,
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 	.config_aneg    = bcm5481_config_aneg,
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 	.ack_interrupt  = bcm_phy_ack_intr,