linux-kernel - Re: [net-next PATCH 06/13] Documentation: devicetree: net: dsa: qca8k: document rgmii_1

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Message-ID: <YV71TCksnbixsYI0@Ansuel-xps.localdomain>
Date:   Thu, 7 Oct 2021 15:25:32 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH 06/13] Documentation: devicetree: net: dsa:
 qca8k: document rgmii_1_8v bindings

On Thu, Oct 07, 2021 at 02:09:36AM +0200, Andrew Lunn wrote:
> On Thu, Oct 07, 2021 at 12:35:56AM +0200, Ansuel Smith wrote:
> > Document new qca,rgmii0_1_8v and qca,rgmii56_1_8v needed to setup
> > mac_pwr_sel register for ar8327 switch.
> > 
> > Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> > ---
> >  Documentation/devicetree/bindings/net/dsa/qca8k.txt | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/dsa/qca8k.txt b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> > index 8c73f67c43ca..1f6b7d2f609e 100644
> > --- a/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> > +++ b/Documentation/devicetree/bindings/net/dsa/qca8k.txt
> > @@ -13,6 +13,8 @@ Required properties:
> >  Optional properties:
> >  
> >  - reset-gpios: GPIO to be used to reset the whole device
> > +- qca,rgmii0-1-8v: Set the internal regulator to supply 1.8v for MAC0 port
> > +- qca,rgmii56-1-8v: Set the internal regulator to supply 1.8v for MAC5/6 port
> 
> What is the consumer of these 1.8v? The MACs are normally internal,
> the regulators are internal, so why is a DT property needed?
> 
>     Andrew

Only some device require this, with these bit at 0, the internal
regulator provide 1.5v. It's not really a on/off but a toggle of the
different operating voltage. Some device require this and some doesn't.

-- 
	Ansuel