linux-kernel - Re: [PATCH] spi: Add the flag indicate to registe new device as children of master or not.

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Date:	Fri, 21 Dec 2012 12:39:52 -0500
From:	Jun Chen <jun.d.chen@...el.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org, Bi Chao <chao.bi@...el.com>,
	spi-devel-general@...ts.sourceforge.net, jun.zhang@...el.com
Subject: Re: [PATCH] spi: Add the flag indicate to registe new device as
 children of master or not.

On Wed, 2012-12-19 at 16:21 +0000, Grant Likely wrote:
> On Wed, 19 Dec 2012 09:04:16 +0000, Mark Brown <broonie@...nsource.wolfsonmicro.com> wrote:
> > On Wed, Dec 19, 2012 at 04:44:03AM -0500, Jun Chen wrote:
> > 
> > > This spi_alloc_device function will be called in the spi_new_device
> > > function to alloc new device as the master. But other way, it is called
> > > by the of_register_spi_devices function to register new device as the
> > > children of the master. I will update changlog to add it. 
> > 
> > But why is this a bad thing?  You've said what's happening but not why
> > it's a problem.
> 
> spi_devices should always be children of the spi_master. If that is not
> the case then it is a bug to be fixed.
> 

When many boards initializing, boards will call function
spi_register_board_info to create bi->board_info,Then spi driver probe
to call spi_register_master to register the driver and in the function
spi_match_master_to_boardinfo To create new spi device, and this cases
the spi_devices are not children of the spi_master.
Many drivers do these steps. If all spi_devices must be children of the
spi_master, Do spi core have plan to delete this way? 
Or spi core can hold this way for many drivers. 
Thanks! 


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