linux-kernel - Re: [PATCH 2/3] net: phy: realtek: Enable accessing RTL8211E extension pages

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Date:   Mon, 1 Jul 2019 14:32:36 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH 2/3] net: phy: realtek: Enable accessing RTL8211E
 extension pages

On Mon, Jul 01, 2019 at 10:43:12PM +0200, Heiner Kallweit wrote:
> On 01.07.2019 21:52, Matthias Kaehlcke wrote:
> > The RTL8211E has extension pages, which can be accessed after
> > selecting a page through a custom method. Add a function to
> > modify bits in a register of an extension page and a few
> > helpers for dealing with ext pages.
> > 
> > rtl8211e_modify_ext_paged() and rtl821e_restore_page() are
> > inspired by their counterparts phy_modify_paged() and
> > phy_restore_page().
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> > This code might be applicable to other Realtek PHYs, but I don't
> > have access to the datasheets to confirm it, so for now it's just
> > for the RTL8211E.
> > 
> This extended page mechanism exists on a number of older Realtek
> PHY's. For most extended pages however Realtek releases no public
> documentation.
> Considering that we use these helpers in one place only,  I don't
> really see a need for them.

I see it as self-documenting code, that may be reused, rather than
inline code with comments.

In any case I'm looking into another patch that would write registers
on extented pages rather than doing a modify, if that materializes I
think we would want the helpers.