linux-kernel - Re: [PATCH v2 4/7] net: phy: realtek: Enable accessing RTL8211E extension pages

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Date:   Wed, 3 Jul 2019 13:36:50 -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 v2 4/7] net: phy: realtek: Enable accessing RTL8211E
 extension pages

On Wed, Jul 03, 2019 at 10:12:12PM +0200, Heiner Kallweit wrote:
> On 03.07.2019 21:37, 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 helper for
> > selecting an ext page.
> > 
> > rtl8211e_modify_ext_paged() is inspired by its counterpart
> > phy_modify_paged().
> > 
> > Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> > ---
> > Changes in v2:
> > - assign .read/write_page handlers for RTL8211E
> 
> Maybe this was planned, but it's not part of the patch.

Oops, it was definitely there when I tested ... I guess this got
somehow lost when changing the patch order and resolving minor
conflicts, seems like I only build tested after that :/

> > - use phy_select_page() and phy_restore_page(), get rid of
> >   rtl8211e_restore_page()
> > - s/rtl821e_select_ext_page/rtl8211e_select_ext_page/
> > - updated commit message
> > ---
> >  drivers/net/phy/realtek.c | 42 +++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 42 insertions(+)
> > 
> > diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
> > index eb815cbe1e72..9cd6241e2a6d 100644
> > --- a/drivers/net/phy/realtek.c
> > +++ b/drivers/net/phy/realtek.c
> > @@ -27,6 +27,9 @@
> >  #define RTL821x_EXT_PAGE_SELECT			0x1e
> >  #define RTL821x_PAGE_SELECT			0x1f
> >  
> > +#define RTL8211E_EXT_PAGE			7
> > +#define RTL8211E_EPAGSR				0x1e
> > +
> >  /* RTL8211E page 5 */
> >  #define RTL8211E_EEE_LED_MODE1			0x05
> >  #define RTL8211E_EEE_LED_MODE2			0x06
> > @@ -58,6 +61,44 @@ static int rtl821x_write_page(struct phy_device *phydev, int page)
> >  	return __phy_write(phydev, RTL821x_PAGE_SELECT, page);
> >  }
> >  
> > +static int rtl8211e_select_ext_page(struct phy_device *phydev, int page)
> > +{
> > +	int ret, oldpage;
> > +
> > +	oldpage = phy_select_page(phydev, RTL8211E_EXT_PAGE);
> > +	if (oldpage < 0)
> > +		return oldpage;
> > +
> > +	ret = __phy_write(phydev, RTL8211E_EPAGSR, page);
> > +	if (ret)
> > +		return phy_restore_page(phydev, page, ret);
> > +
> > +	return 0;
> > +}
> > +
> > +static int __maybe_unused rtl8211e_modify_ext_paged(struct phy_device *phydev,
> > +				    int page, u32 regnum, u16 mask, u16 set)
> 
> This __maybe_unused isn't too nice as you use the function in a subsequent patch.

It's needed to avoid a compiler warning (unless we don't care about
that for an interim version), the attribute is removed again in the
next patch.