netdev - Re: [PATCH net-next v3 03/10] net: stmmac: mdio: enlarge the max XGMAC C22 ADDR to 31

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Message-ID: <DM3PR11MB871491A357B9A12BF1B0CC82DE16A@DM3PR11MB8714.namprd11.prod.outlook.com>
Date: Sun, 13 Aug 2023 14:18:27 +0000
From: "G Thomas, Rohan" <rohan.g.thomas@...el.com>
To: "jszhang@...nel.org" <jszhang@...nel.org>
CC: "alexandre.torgue@...s.st.com" <alexandre.torgue@...s.st.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>, "davem@...emloft.net"
	<davem@...emloft.net>, "devicetree@...r.kernel.org"
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	"kuba@...nel.org" <kuba@...nel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
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	"peppe.cavallaro@...com" <peppe.cavallaro@...com>, "robh+dt@...nel.org"
	<robh+dt@...nel.org>
Subject: Re: [PATCH net-next v3 03/10] net: stmmac: mdio: enlarge the max
 XGMAC C22 ADDR to 31


On 8/9/23 18:50, Jisheng Zhang wrote:
> The IP can support up to 31 xgmac c22 addresses now.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> index 3db1cb0fd160..e6d8e34fafef 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
> @@ -40,7 +40,7 @@
>   #define MII_XGMAC_WRITE			(1 << MII_XGMAC_CMD_SHIFT)
>   #define MII_XGMAC_READ			(3 << MII_XGMAC_CMD_SHIFT)
>   #define MII_XGMAC_BUSY			BIT(22)
> -#define MII_XGMAC_MAX_C22ADDR		3
> +#define MII_XGMAC_MAX_C22ADDR		31
>   #define MII_XGMAC_C22P_MASK		GENMASK(MII_XGMAC_MAX_C22ADDR, 0)
>   #define MII_XGMAC_PA_SHIFT		16
>   #define MII_XGMAC_DA_SHIFT		21

Recent commit 10857e677905 ("net: stmmac: XGMAC support for mdio C22
addr > 3") already addressed this in a different way. As per Synopsis
IP team until version 2.2, XGMAC supports only MDIO devices 0 - 3. An
XGMAC IP version check is newly added for the same reason. I think this
covers your commit also. Please have a look and if so you can drop this
commit.

BR,
Rohan