netdev - Re: [PATCH] using mii-bitbang on different processor ports

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Message-Id: <1194608283.8755.10.camel@p60635-ste.ids.de>
Date:	Fri, 09 Nov 2007 12:38:03 +0100
From:	Sergej Stepanov <Sergej.Stepanov@....de>
To:	Scott Wood <scottwood@...escale.com>
Cc:	linuxppc-dev@...abs.org, netdev@...r.kernel.org, jgarzik@...ox.com
Subject: Re: [PATCH] using mii-bitbang on different processor ports
	-	update the booting-without-of.txt-file

Am Donnerstag, den 08.11.2007, 14:20 -0600 schrieb Scott Wood: 
> Sergej Stepanov wrote:
> > If both mdio and mdc controlling pins are on the same processor port,
> > one resource should be used.
> > Otherwise, two resources are used: the 1-st - mdio, the 2-nd - mdc.
> 
> How about:
> The first reg resource is the I/O port register block on which MDIO 
> resides.  The second reg resource is the I/O port register block on 
> which MDC resides.  If there is only one reg resource, it is used for 
> both MDIO and MDC.
> 
Ok.

> We also need to change the reference to port C in fsl,mdio-pin and 
> fsl,mdc-pin.
Do you mean this:
   Currently defined compatibles:
   fsl,pq1-fec-mdio (reg is same as first resource of FEC device)
-> fsl,cpm2-mdio-bitbang (reg is port C registers)

   Properties for fsl,cpm2-mdio-bitbang:
-> fsl,mdio-pin : pin of port C controlling mdio data
-> fsl,mdc-pin : pin of port C controlling mdio clock

Right. But i thought it would be related to the example,
and than the reader gets the short comment about I/O ports.

Or the other variant would be:
--------------------
   iv) MDIO

   Currently defined compatibles:
   fsl,pq1-fec-mdio (reg is same as first resource of FEC device)
   fsl,cpm2-mdio-bitbang (reg is the I/O port register block(s))

   Properties for fsl,cpm2-mdio-bitbang:
   The first reg resource is the I/O port register block on which MDIO
   resides.  The second reg resource is the I/O port register block on
   which MDC resides.  If there is only one reg resource, it is used for
   both MDIO and MDC.
   fsl,mdio-pin : pin of chosen port for controlling mdio data
   fsl,mdc-pin : pin of chosen port for controlling mdio clock

   Example:
	mdio@...40 {
	device_type = "mdio";
	compatible = "fsl,mpc8272ads-mdio-bitbang",
        	     "fsl,mpc8272-mdio-bitbang",
       		     "fsl,cpm2-mdio-bitbang";
	reg = <10d40 14>;
	#address-cells = <1>;
	#size-cells = <0>;
	fsl,mdio-pin = <12>;
	fsl,mdc-pin = <13>;
	};
-----------------

Regards
Sergej.

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