netdev - Re: [RFC PATCH v2 linux-next 03/14] net: dsa: sja1105: the 0x1F0000 SGMII "base address" is actually MDIO_MMD

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Message-ID: <20210526152454.GG30436@shell.armlinux.org.uk>
Date:   Wed, 26 May 2021 16:24:54 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [RFC PATCH v2 linux-next 03/14] net: dsa: sja1105: the 0x1F0000
 SGMII "base address" is actually MDIO_MMD_VEND2

On Wed, May 26, 2021 at 04:55:24PM +0300, Vladimir Oltean wrote:
> -	const struct sja1105_regs *regs = priv->info->regs;
> +	u64 addr = (mmd << 16) | pcs_reg;

What is the reason for using "u64" here. pcs_reg is 16-bits, and mmd is
five bits, which is well below 32 bits. So, why not u32?

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