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Date:	Fri, 8 May 2015 18:46:47 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Bert Vermeulen <bert@...t.com>
Cc:	f.fainelli@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mdio-gpio: Allow for unspecified bus id

> >> -	snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
> >> +	if (bus_id != -1)
> >> +		snprintf(new_bus->id, MII_BUS_ID_SIZE, "gpio-%x", bus_id);
> >> +	else
> >> +		strncpy(new_bus->id, "gpio", MII_BUS_ID_SIZE);
> > 
> > Hi Bert
> > 
> > What happens if there are multiple platform_device's with -1?  You
> > should probably be using use idr_alloc().
> 
> It's an instance id per driver, not globally, and -1 specifically means it's
> the only instance. From Documentation/driver-model/platform.txt:

Ah, did not know there can only be one with -1. I've used i2c where
this does not apply when registering adaptors. It will allocate a
unique id to each added with id = -1.

       Andrew
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