linux-kernel - Re: [PATCH net-next v3 6/8] net: phy: mscc: timestamping and PHC support

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Message-ID: <7520915d32e185d2ca29f085b988d55e@0leil.net>
Date:   Sun, 21 Jun 2020 19:35:20 +0200
From:   Quentin Schulz <foss@...il.net>
To:     Antoine Tenart <antoine.tenart@...tlin.com>
Cc:     davem@...emloft.net, andrew@...n.ch, f.fainelli@...il.com,
        hkallweit1@...il.com, richardcochran@...il.com,
        alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com, allan.nielsen@...rochip.com
Subject: Re: [PATCH net-next v3 6/8] net: phy: mscc: timestamping and PHC
 support

Hi Antoine,

On 2020-06-19 14:22, Antoine Tenart wrote:
[...]
> @@ -999,9 +1553,35 @@ int vsc8584_ptp_probe(struct phy_device *phydev)
>  	if (!vsc8531->ptp)
>  		return -ENOMEM;
> 
> +	mutex_init(&vsc8531->phc_lock);
>  	mutex_init(&vsc8531->ts_lock);
> 
> +	/* Retrieve the shared load/save GPIO. Request it as non exclusive as
> +	 * the same GPIO can be requested by all the PHYs of the same 
> package.
> +	 * Ths GPIO must be used with the phc_lock taken (the lock is shared

Typo + wrong lock named in the comment, instead:

	 * This GPIO must be used with the gpio_lock taken (the lock is shared

Though technically both are taken when access to the GPIO is requested 
AFAICT.

Also on another note, maybe we could actually make vsc8531->base_addr be 
a part
of vsc85xx_shared_private structure.

We would still need to compute it to pass it to devm_phy_package_join 
but it can
easily be returned by vsc8584_get_base_addr instead of the current void 
and it'd
put all the things used for all PHYs in the package at the same place.

Thanks,
Quentin