netdev - Re: [PATCH net-next 1/3] net: phy: add concept of shared storage for PHYs

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Message-ID: <3649566c-1424-133f-fed0-b920874fb36b@gmail.com>
Date:   Mon, 4 May 2020 10:45:14 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Michael Walle <michael@...le.cc>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Antoine Tenart <antoine.tenart@...tlin.com>
Subject: Re: [PATCH net-next 1/3] net: phy: add concept of shared storage for
 PHYs



On 5/4/2020 9:38 AM, Michael Walle wrote:
> There are packages which contain multiple PHY devices, eg. a quad PHY
> transceiver. Provide functions to allocate and free shared storage.
> 
> Usually, a quad PHY contains global registers, which don't belong to any
> PHY. Provide convenience functions to access these registers.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>

This looks pretty good, just a few comments below.

[snip]

> +
> +/**
> + * devm_phy_package_join - resource managed phy_package_join()
> + * @dev: device that is registering this GPIO device

You mean device registering this PHY package here?

[snip]

Might be worth a comment that this is a used as a bit number.

> +
> +#define PHY_SHARED_F_INIT_DONE 0
> +
>  /*
>   * The Bus class for PHYs.  Devices which provide access to
>   * PHYs should register using this structure
> @@ -278,6 +301,12 @@ struct mii_bus {
>  	int reset_delay_us;
>  	/* RESET GPIO descriptor pointer */
>  	struct gpio_desc *reset_gpiod;
> +
> +	/* protect access to the shared element */
> +	struct mutex shared_lock;
> +
> +	/* shared state across different PHYs */
> +	struct phy_package_shared *shared[PHY_MAX_ADDR];
>  };
>  #define to_mii_bus(d) container_of(d, struct mii_bus, dev)
>  
> @@ -478,6 +507,10 @@ struct phy_device {
>  	/* For use by PHYs to maintain extra state */
>  	void *priv;
>  
> +	/* shared data pointer */
> +	/* For use by PHYs inside the same package and needs a shared state. */

s/and needs/that need/
-- 
Florian