linux-kernel - Re: [PATCH net v4 1/2] phy: mscc: Use PHY_ID_MATCH_MODEL for VSC8584, VSC8582, VSC8575, VSC856X

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Message-ID: <aPdNrFe4JfCTNbAM@shell.armlinux.org.uk>
Date: Tue, 21 Oct 2025 10:09:00 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc: andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	richardcochran@...il.com, vladimir.oltean@....com,
	vadim.fedorenko@...ux.dev, christophe.jaillet@...adoo.fr,
	rosenp@...il.com, steen.hegelund@...rochip.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v4 1/2] phy: mscc: Use PHY_ID_MATCH_MODEL for
 VSC8584, VSC8582, VSC8575, VSC856X

On Fri, Oct 17, 2025 at 08:48:18AM +0200, Horatiu Vultur wrote:
> As the PHYs VSC8584, VSC8582, VSC8575 and VSC856X exists only as rev B,
> we can use PHY_ID_MATCH_MODEL to match exactly on revision B of the PHY.

I don't follow this. PHY_ID_MATCH_MODEL() uses a mask of bits 31:4,
omitting the revision field. So that is equivalent to a .phy_id_mask
of 0xfffffff0, which is what the code already uses.

> Because of this change then there is not need the check if it is a
> different revision than rev B in the function vsc8584_probe() as we
> already know that this will never happen.

Since bits 3:0 are masked out, this statement seems to be false.

> @@ -2587,9 +2576,8 @@ static struct phy_driver vsc85xx_driver[] = {
>  	.config_inband  = vsc85xx_config_inband,
>  },
>  {
> -	.phy_id		= PHY_ID_VSC856X,
> +	PHY_ID_MATCH_MODEL(PHY_ID_VSC856X),
>  	.name		= "Microsemi GE VSC856X SyncE",
> -	.phy_id_mask	= 0xfffffff0,
>  	/* PHY_GBIT_FEATURES */
>  	.soft_reset	= &genphy_soft_reset,
>  	.config_init    = &vsc8584_config_init,
> @@ -2667,9 +2655,8 @@ static struct phy_driver vsc85xx_driver[] = {
>  	.config_inband  = vsc85xx_config_inband,
>  },
>  {
> -	.phy_id		= PHY_ID_VSC8575,
> +	PHY_ID_MATCH_MODEL(PHY_ID_VSC8575),
>  	.name		= "Microsemi GE VSC8575 SyncE",
> -	.phy_id_mask	= 0xfffffff0,
>  	/* PHY_GBIT_FEATURES */
>  	.soft_reset	= &genphy_soft_reset,
>  	.config_init    = &vsc8584_config_init,
> @@ -2693,9 +2680,8 @@ static struct phy_driver vsc85xx_driver[] = {
>  	.config_inband  = vsc85xx_config_inband,
>  },
>  {
> -	.phy_id		= PHY_ID_VSC8582,
> +	PHY_ID_MATCH_MODEL(PHY_ID_VSC8582),
>  	.name		= "Microsemi GE VSC8582 SyncE",
> -	.phy_id_mask	= 0xfffffff0,
>  	/* PHY_GBIT_FEATURES */
>  	.soft_reset	= &genphy_soft_reset,
>  	.config_init    = &vsc8584_config_init,
> @@ -2719,9 +2705,8 @@ static struct phy_driver vsc85xx_driver[] = {
>  	.config_inband  = vsc85xx_config_inband,
>  },
>  {
> -	.phy_id		= PHY_ID_VSC8584,
> +	PHY_ID_MATCH_MODEL(PHY_ID_VSC8584),
>  	.name		= "Microsemi GE VSC8584 SyncE",
> -	.phy_id_mask	= 0xfffffff0,
>  	/* PHY_GBIT_FEATURES */
>  	.soft_reset	= &genphy_soft_reset,
>  	.config_init    = &vsc8584_config_init,

Due to what I've said above, the above part of the patch is a cleanup,
and functionally is a no-op.

-- 
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