netdev - Re: [PATCH v4 04/14] net: phy: adin: add {write,read}

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Message-ID: <20190812140648.GN14290@lunn.ch>
Date:   Mon, 12 Aug 2019 16:06:48 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        robh+dt@...nel.org, mark.rutland@....com, f.fainelli@...il.com,
        hkallweit1@...il.com
Subject: Re: [PATCH v4 04/14] net: phy: adin: add {write,read}_mmd hooks

On Mon, Aug 12, 2019 at 02:23:40PM +0300, Alexandru Ardelean wrote:
> Both ADIN1200 & ADIN1300 support Clause 45 access for some registers.
> The Extended Management Interface (EMI) registers are accessible via both
> Clause 45 (at register MDIO_MMD_VEND1) and using Clause 22.
> 
> The Clause 22 access for MMD regs differs from the standard one defined by
> 802.3. The ADIN PHYs  use registers ExtRegPtr (0x0010) and ExtRegData
> (0x0011) to access Clause 45 & EMI registers.
> 
> The indirect access is done via the following mechanism (for both R/W):
> 1. Write the address of the register in the ExtRegPtr
> 2. Read/write the value of the register via reg ExtRegData
> 
> This mechanism is needed to manage configuration of chip settings and to
> access EEE registers via Clause 22.
> 
> Since Clause 45 access will likely never be used, it is not implemented via
> this hook.
> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew