linux-kernel - Re: [PATCH net-next v3 03/11] net: phy: replace is_c45 with phy_accces

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Message-ID: <509889a3-f633-40b0-8349-9ef378818cc7@lunn.ch>
Date:   Tue, 18 Jul 2023 19:40:49 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <mwalle@...nel.org>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Marek Behún <kabel@...nel.org>,
        Xu Liang <lxu@...linear.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Simon Horman <simon.horman@...igine.com>
Subject: Re: [PATCH net-next v3 03/11] net: phy: replace is_c45 with
 phy_accces_mode

>  static inline bool phy_has_c45_registers(struct phy_device *phydev)
>  {
> -	return phydev->is_c45;
> +	return phydev->access_mode != PHY_ACCESS_C22;
>  }

So this is making me wounder if we have a clean separation between
register spaces and access methods.

Should there be a phy_has_c22_registers() ?

A PHY can have both C22 registers and C45 registers. It is up to the
driver to decide which it wants to access when.

Should phydev->access_mode really be phydev->access_mode_c45_registers
to indicate how to access the C45 registers if phy_has_c45_registers()
is true?

Has there been a review of all uses of phydev->is_c45 to determine if
the user wants to know if C45 registers exist,
a.k.a. phy_has_c45_registers(), or if C45 bus transactions can be
performed, and then later in this series, additionally if C45 over C22
can be performed. These are different things.

I need to keep reading the patches...

  Andrew