netdev - Re: [PATCH net-next 3/3] net: phy: broadcom: Wire suspend/resume for BCM54810

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Message-ID: <20200215161204.GB8924@lunn.ch>
Date:   Sat, 15 Feb 2020 17:12:04 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 3/3] net: phy: broadcom: Wire suspend/resume for
 BCM54810

On Fri, Feb 14, 2020 at 03:38:53PM -0800, Florian Fainelli wrote:
> The BCM54810 PHY can use the standard BMCR Power down suspend, but needs
> a custom resume routine which first clear the Power down bit, and then
> re-initializes the PHY. While in low-power mode, the PHY only accepts
> writes to the BMCR register. The datasheet clearly says it:
> 
> Reads or writes to any MII register other than MII Control register
> (address 00h) while the device is in the standby power-down mode may
> cause unpredictable results.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

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

    Andrew