linux-kernel - Re: [PATCH v5 1/3] mfd: Add support for Cherry Trail Dollar Cove TI PMIC

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Message-ID: <s5hingxtvho.wl-tiwai@suse.de>
Date:   Tue, 05 Sep 2017 10:12:03 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Johannes Stezenbach <js@...21.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/3] mfd: Add support for Cherry Trail Dollar Cove TI PMIC

On Tue, 05 Sep 2017 10:00:23 +0200,
Hans de Goede wrote:
> 
> Hi,
> 
> On 05-09-17 09:46, Takashi Iwai wrote:
> > On Tue, 05 Sep 2017 09:24:51 +0200,
> > Lee Jones wrote:
> >>
> >> On Mon, 04 Sep 2017, Takashi Iwai wrote:
> >>
> >>> This patch adds the MFD driver for Dollar Cove (TI version) PMIC with
> >>> ACPI INT33F5 that is found on some Intel Cherry Trail devices.
> >>> The driver is based on the original work by Intel, found at:
> >>>    https://github.com/01org/ProductionKernelQuilts
> >>>
> >>> This is a minimal version for adding the basic resources.  Currently,
> >>> only ACPI PMIC opregion and the external power-button are used.
> >>>
> >>> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=193891
> >>> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> >>> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> >>> Signed-off-by: Takashi Iwai <tiwai@...e.de>
> >>> ---
> >>> v4->v5:
> >>> * Minor coding-style fixes suggested by Lee
> >>> * Put GPL text
> >>> v3->v4:
> >>> * no change for this patch
> >>> v2->v3:
> >>> * Rename dc_ti with chtdc_ti in all places
> >>> * Driver/kconfig renames accordingly
> >>> * Added acks by Andy and Mika
> >>> v1->v2:
> >>> * Minor cleanups as suggested by Andy
> >>>
> >>>   drivers/mfd/Kconfig                   |  13 +++
> >>>   drivers/mfd/Makefile                  |   1 +
> >>>   drivers/mfd/intel_soc_pmic_chtdc_ti.c | 184 ++++++++++++++++++++++++++++++++++
> >>>   3 files changed, 198 insertions(+)
> >>>   create mode 100644 drivers/mfd/intel_soc_pmic_chtdc_ti.c
> >>
> >> For my own reference:
> >>    Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> >
> > Thanks!
> >
> > Now the question is how to deal with these.  It's no critical things,
> > so I'm OK to postpone for 4.15.  OTOH, it's really a new
> > device-specific stuff, thus it can't break anything else, and it'd be
> > fairly safe to add it for 4.14 although it's at a bit late stage.
> >
> > IMO, it'd be great if you can carry all stuff through MFD tree; or
> > create an immutable branch (again).  But how to handle it, when to do
> > it, It's all up to you guys.
> 
> Since the mfd driver only instantiates platform devices there
> is only a runtime dependency between the drivers AFAICT so each
> driver can be merged through it own subsystem without problem /
> without the need for an immutable branch, or am I missing something ?

Yeah, it wouldn't do much harm other than containing the dead code.

I'm afraid of missing kconfig or such error splat spotted by build
bot, if we merge each commit individually.  But maybe I have just too
strong trauma of the build bot complaints :)


thanks,

Takashi