linux-kernel - Re: [PATCH v3] dt-bindings: net: Convert mdio-gpio to yaml

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Message-ID: <YI/pG3GSIpse+OEo@lunn.ch>
Date:   Mon, 3 May 2021 14:14:19 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     LABBE Corentin <clabbe@...libre.com>
Cc:     Rob Herring <robh@...nel.org>, hkallweit1@...il.com,
        linux@...linux.org.uk, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3] dt-bindings: net: Convert mdio-gpio to yaml

> > What's the order with 3 lines? In any case, define the order with 
> > schema:
> > 
> > minItems:
> > items:
> >   - description: MDC signal
> >   - description: MDIO or ?? signal
> >   - description: ?? signal
> > 
> 
> I dont know what to write in the third line, I added the "maxItems: 3" by request of Andrew Lunn.
> But I have no example at hand.
> 
> Andrew could you give me an example of:	"You often find with x86 machines you don't have GPIOs, just GPI
> and GPO, and you need to combine two to form the MDIO line of the MDIO bus."
> Or could I drop the "maxItems: 3" until a board need it.

The code gets the GPIOs via index. The index are defined in
include/linux/gpio-mdio.h as:

#define MDIO_GPIO_MDC	0
#define MDIO_GPIO_MDIO	1
#define MDIO_GPIO_MDO	2

So you can describe them MDC, MDIO, MDO.

   Andrew