linux-kernel - Re: [PATCH v2 6/9] mfd: add TI LMU hardware fault monitoring driver

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Date:	Tue, 12 Jan 2016 07:37:32 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Milo Kim <milo.kim@...com>
Cc:	robh+dt@...nel.org, j.anaszewski@...sung.com, broonie@...nel.org,
	devicetree@...r.kernel.org, linux-leds@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/9] mfd: add TI LMU hardware fault monitoring driver

On Tue, 12 Jan 2016, Milo Kim wrote:

> On 01/11/2016 07:21 PM, Lee Jones wrote:
> >On Thu, 26 Nov 2015, Milo Kim wrote:
> >
> >>LM3633 and LM3697 are TI LMU MFD device.
> >>Those devices have hardware monitoring feature which detects open or
> >>short circuit case.
> >>
> >>Debugfs
> >>-------
> >>   Two files are created.
> >>     open_fault:  check light output channel is open or not.
> >>     short_fault: check light output channel is shorted or not.
> >>
> >>   The driver checks the status of backlight output channels.
> >>   LM3633 and LM3697 have same sequence to check channels, so common
> >>   functions are used.
> >>   ABI/testing document is also included.
> >>
> >>Operations
> >>----------
> >>   Two devices have common control flow but register addresses are different.
> >>   The structure, 'ti_lmu_reg' is used for register configuration.
> >>
> >>Event notifier
> >>--------------
> >>   After fault monitoring is done, LMU device is reset. So backlight and
> >>   LED device should be reinitialized. It notifies an event as soon as
> >>   the monitoring is done. Then, LM3633 and LM3697 backlight and LED drivers
> >>   handle this event.
> >>
> >>Cc: Lee Jones <lee.jones@...aro.org>
> >>Cc: Jacek Anaszewski <j.anaszewski@...sung.com>
> >>Cc: Mark Brown <broonie@...nel.org>
> >>Cc: Rob Herring <robh+dt@...nel.org>
> >>Cc: devicetree@...r.kernel.org
> >>Cc: linux-leds@...r.kernel.org
> >>Cc: linux-kernel@...r.kernel.org
> >>Signed-off-by: Milo Kim <milo.kim@...com>
> >>---
> >>  .../ABI/testing/debugfs-ti-lmu-fault-monitor       |  32 ++
> >>  drivers/mfd/Kconfig                                |  10 +
> >>  drivers/mfd/Makefile                               |   1 +
> >>  drivers/mfd/ti-lmu-fault-monitor.c                 | 405 +++++++++++++++++++++
> >
> >I think this device is part of the MFD, rather than an MFD itself.
> >Please relocate it to somewhere more appropriate.
> 
> Actually, initial patch driver was created under 'drivers/hwmon/'
> but HWMON maintainer pointed this driver doesn't include HW sensor
> feature.
> So I moved here.
> 
> This driver doesn't need any subsystem infrastructure,
> 'drivers/misc/' could be OK. Does it make sense?

Either drivers/misc or drivers/platform I guess.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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