Re: [PATCH 1/5] iTCO_wdt: Expose watchdog properties using platform data

[Matt Fleming <matt@codeblueprint.co.uk>]

On Mon, 27 Jul, at 04:33:44PM, Lee Jones wrote:
> On Mon, 27 Jul 2015, Matt Fleming wrote:
> 
> > From: Matt Fleming <matt.fleming@intel.com>
> > 
> > Intel Sunrisepoint (Skylake PCH) has the iTCO watchdog accessible across
> > the SMBus, unlike previous generations of PCH/ICH where it was on the
> > LPC bus. Because it's on the SMBus, it doesn't make sense to pass around
> > a 'struct lpc_ich_info', and leaking the type of bus into the iTCO
> > watchdog driver is kind of backwards anyway.
> > 
> > This change introduces a new 'struct iTCO_wdt_platform_data' for use
> > inside the iTCO watchdog driver and by the upcoming Intel Sunrisepoint
> > code, which neatly avoids having to include lpc_ich headers in the i801
> > i2c driver.
> > 
> > A simple translation layer is provided for converting from the existing
> > 'struct lpc_ich_info' inside the lpc_ich mfd driver.
> 
> Is this patch related to Andy's patch-set?
> 
>   https://lkml.org/lkml/2015/7/27/599
 
Nope, the two are independent.

> > Cc: Peter Tyser <ptyser@xes-inc.com>
> > Cc: Samuel Ortiz <sameo@linux.intel.com>
> > Cc: Lee Jones <lee.jones@linaro.org>
> > Cc: Wim Van Sebroeck <wim@iguana.be>
> > Signed-off-by: Matt Fleming <matt.fleming@intel.com>
> > ---
> >  drivers/mfd/lpc_ich.c                  | 32 +++++++++++++++++++++++++++++---
> >  drivers/watchdog/Kconfig               |  2 +-
> >  drivers/watchdog/iTCO_wdt.c            | 11 +++++------
> >  include/linux/mfd/lpc_ich.h            |  6 ------
> >  include/linux/platform_data/iTCO_wdt.h | 18 ++++++++++++++++++
> >  5 files changed, 53 insertions(+), 16 deletions(-)
> >  create mode 100644 include/linux/platform_data/iTCO_wdt.h
> 
> How are all of these changes related?
 
They create the platform data struct and use it in lpc_ich and iTCO_wdt.
The Kconfig change shouldn't have snuck into this patch though, that's
wrong, sorry.

> Why do they all have to be in a single patch?

I'll happily split them into more patches if you'd prefer. Maybe one
that introduces the platform data structure and then a separate one that
uses it in iTCO_wdt and lpc_ich?

Technically we could also split the change between iTCO_wdt and lpc_ich,
but then we'd be passing in an 'lpc_ich_info' and pulling out a
'iTCO_wdt_platform_data' and that just seems crazy.

-- 
Matt Fleming, Intel Open Source Technology Center