linux-kernel - Re: [PATCH net-next v6] net: phy: intel-xway: Add RGMII internal delay configuration

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Message-ID: <7f427d3c93f2cbacbb7273a5af9e4b41@dev.tdt.de>
Date:   Tue, 20 Jul 2021 13:50:48 +0200
From:   Martin Schiller <ms@....tdt.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     hauke@...ke-m.de, martin.blumenstingl@...glemail.com,
        f.fainelli@...il.com, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v6] net: phy: intel-xway: Add RGMII internal
 delay configuration

On 2021-07-19 22:56, Andrew Lunn wrote:
>> +	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
>> +	    phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
>> +		int_delay = phy_get_internal_delay(phydev, dev,
>> +						   xway_internal_delay,
>> +						   delay_size, true);
>> +
>> +		if (int_delay < 0) {
>> +			phydev_warn(phydev, "rx-internal-delay-ps is missing, use default 
>> of 2.0 ns\n");
>> +			int_delay = 4; /* 2000 ps */
> 
> The binding say:
> 
>  rx-internal-delay-ps:
>     description: |
>       RGMII Receive PHY Clock Delay defined in pico seconds.  This is 
> used for
>       PHY's that have configurable RX internal delays.  If this 
> property is
>       present then the PHY applies the RX delay.
> 
> So the property is optional. It being missing should not generate a
> warning. Please just use the default of 2ns. This makes the usage the
> same as the other drivers using phy_get_internal_delay().
> 
>      Andrew

OK, I'll remove the warnings. Thanks.