linux-kernel - Re: Fwd: [Proposal] PM sleep children of inactive I2C bus segments off Masters in multi-master systems

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Message-ID: <20141001211657.GA7904@svl-evodev-groeck.juniper.net>
Date:	Wed, 1 Oct 2014 14:16:57 -0700
From:	Guenter Roeck <groeck@...iper.net>
To:	Wolfram Sang <wsa@...-dreams.de>
CC:	Danielle Costantino <danielle.costantino@...il.com>,
	linux-i2c <linux-i2c@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Rajat Jain <rajatjain@...iper.net>
Subject: Re: Fwd: [Proposal] PM sleep children of inactive I2C bus segments
 off Masters in multi-master systems

On Wed, Oct 01, 2014 at 11:10:47PM +0200, Wolfram Sang wrote:
> 
> > Maybe you can find an error code which with some level of confidence
> > reflects "lost mastership". Then you can implement whatever makes sense
> > for your use case in your user space application(s).
> 
> We have a documented fault code for ArbitrationLost and that is -EAGAIN
> (see Documentation/i2c/fault-codes). If a driver does use something
> else, patches are very welcome.
> 
> Other than that, I find this thread very confusing. Of course can
> another master modify the clients, this is what multi-master is all
> about, no?
> 
That is the point I was trying to make in one of my earlier replies.

Guenter
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