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

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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" <devicetree@...r.kernel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "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