linux-kernel - Re: [PATCH 0/2] OMAP: fix boot sequence

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Date:	Tue, 23 Apr 2013 10:34:42 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	linux-omap@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] OMAP: fix boot sequence

* Grygorii Strashko <grygorii.strashko@...com> [130423 06:25]:
> Hi
> 
> There are two public discussions now related to OMAP boot and drivers
> initialization issues:
> "Multiple issues with omap4 panda es in linux next"
>   http://www.spinics.net/lists/linux-omap/msg90241.html
> "[BUG] omap: mfd/regulator: twl/core: init order"
>   http://www.spinics.net/lists/linux-omap/msg89980.html
> 
> In both cases there are pinctrl-single/I2C/MFD/Regulators initailization issue:
> - regulators are not initialized because of twl,
> - twl is not initialized because of I2C,
> - I2C is not initialized because of pinctrl-single,
> - pinctrl-single is initialized at mudule/device init time.
> So, most everything will be shifted at late_initcall time. 
> 
> This may cause boot delay (more over, it can broken initialization of drivers
> which are not ready to use deferred probe mechanism yet, for example DSS).
> 
> Introduced pathes shift I2C and TWL iniialization to module/device init layer
> instead of subsys init layer where initialization dependencies resolved
> indirectly in drivers/Makefile now.
> 
> Grygorii Strashko (2):
>   i2c: omap: convert to module_platform_driver()
>   mfd: twl-core: convert to module_i2c_driver()
> 
>  drivers/i2c/busses/i2c-omap.c |   14 +-------------
>  drivers/mfd/twl-core.c        |   12 +-----------
>  2 files changed, 2 insertions(+), 24 deletions(-)

Thanks, I have few questions:

1. It seems that the real fix to the issues we're seeing
   is to make the broken drivers to support -EPROBE_DEFER?

2. If so, can these be merged later on as clean-up?

3. Can these two patches be merged separately without
   breaking things?

Regards,

Tony
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