netdev - Re: [linux-sunxi] Re: [PATCH] net: phy: realtek: omit setting PHY-side delay when "rgmii" specified

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Date:   Mon, 26 Oct 2020 13:12:57 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Willy Liu <willy.liu@...ltek.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] Re: [PATCH] net: phy: realtek: omit setting
 PHY-side delay when "rgmii" specified

> By referring to linux/phy.h, NA means not applicable. This surely
> do not apply when RGMII is really in use.

It means the PHY driver should not touch the mode, something else has
set it up. That could be strapping, the bootloader, ACPI firmware,
whatever.

> I think no document declares RGMII must have all internal delays
> of the PHY explicitly disabled. It just says RGMII.

Please take a look at all the other PHY drivers. They should all
disable delays when passed PHY_INTERFACE_MODE_RGMII.

	Andrew