From: Javier Martinez Canillas <javier@osg.samsung.com>
To: "H. Nikolaus Schaller" <hns@goldelico.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: "Mark Rutland" <mark.rutland@arm.com>,
"Michel Verlaan" <michel.verl@gmail.com>,
"Nick Dyer" <nick@shmanahar.org>,
"Tony Lindgren" <tony@atomide.com>,
LKML <linux-kernel@vger.kernel.org>,
"Benjamin Tissoires" <benjamin.tissoires@redhat.com>,
linux-omap <linux-omap@vger.kernel.org>,
"Russell King" <linux@armlinux.org.uk>,
"Igor Grinberg" <grinberg@compulab.co.il>,
"Hans Verkuil" <hans.verkuil@cisco.com>,
linux-input@vger.kernel.org,
devicetree <devicetree@vger.kernel.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Eric Engestrom" <eric@engestrom.ch>,
"Hans de Goede" <hdegoede@redhat.com>,
"Rob Herring" <robh+dt@kernel.org>,
"Mika Penttilä" <mika.penttila@nextfour.com>,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"Petr Cvek" <petr.cvek@tul.cz>,
"Siebren Vroegindeweij" <siebren.vroegindeweij@hotmail.com>,
"Sebastian Reichel" <sre@kernel.org>,
linux-iio@vger.kernel.org, "Andrew F. Davis" <afd@ti.com>,
"Mark Brown" <broonie@kernel.org>,
"Benoît Cousson" <bcousson@baylibre.com>,
kernel@pyra-handheld.com, "Michael Welling" <mwelling@ieee.org>,
"Jonathan Cameron" <jic23@kernel.org>,
"Alexander Stein" <alexander.stein@systec-electronic.com>,
"Discussions about the Letux Kernel"
<letux-kernel@openphoenux.org>
Subject: Re: [PATCH v9 6/8] drivers:input:ads7846(+tsc2046): fix spi module table
Date: Wed, 1 Feb 2017 18:14:39 -0300 [thread overview]
Message-ID: <cc403765-9b88-1424-a77f-36e775fbd5a0@osg.samsung.com> (raw)
In-Reply-To: <B64DBFB0-62E8-4B4C-957F-C90C33BEF693@goldelico.com>
Hello Nikolaus,
On 02/01/2017 05:20 PM, H. Nikolaus Schaller wrote:
> Hi Dmitry, Javier,
>
>> Am 29.01.2017 um 19:25 schrieb H. Nikolaus Schaller <hns@goldelico.com>:
>>
>> Hi Dmitry,
>>
>>> Am 29.01.2017 um 19:01 schrieb Dmitry Torokhov <dmitry.torokhov@gmail.com>:
>>>
>>> On Sun, Jan 29, 2017 at 09:39:39AM +0100, H. Nikolaus Schaller wrote:
>>>> Hi Dmitry,
>>>>
>>>>> Am 28.01.2017 um 20:35 schrieb Dmitry Torokhov <dmitry.torokhov@gmail.com>:
>>>>>
>>>>> On Wed, Dec 28, 2016 at 03:53:21PM +0100, H. Nikolaus Schaller wrote:
>>>>>> Fix module table so that the driver is loaded if compiled
>>>>>> as module and requested by DT.
>>>>>>
>>>>>
>>>>> I believe I already replied to a similar patch: we alreadyhave necessary
>>>>> aliases in this driver, we need to fix module loading to use it.
>>>>
>>>> Yes, you did comment on [PATCH v6 7/8] (19 Nov 2016):
>>>>
>>>>>> We really need to fix it between spi/i23c core and module utils instead
>>>>>> of keeping adding duplicate IDs all over drivers. We already have OF
>>>>>> module device table containing the same data, we should be able to use
>>>>>> it.
>>>>
>>>> And Javier Martinez Canillas replied (23 Nov 2016):
>>>>
>>>>> Agreed, unfortunately until the I2C and SPI core are changed to properly
>>>>> report OF modaliases, we will have to keep adding these duplicated IDs.
>>>>>
>>>>> And changing the I2C and SPI core isn't trivial since it could break a
>>>>> lot of drivers that rely on a platform modalias being reported (i.e: no
>>>>> OF device IDs present in the drivers even when are registered via DT).
>>>>
>>>> Therefore I didn't see a need to change it.
>>>
>>> I agree that changing I2C and SPI core is not trivial, however this is
>>> no reason for piling up workarounds in all drivers. Are you seriously
>>> advocating going though *every* driver and copying OF data into I2C/SPI
>>> instead of doing the right thing and fixing the root of the issue?
>>
>> If you prefer to have this done (and I agree it would be a tiny improvement),
>> please do it for us all. But please after merging this workaround.
>
> Have we been lucky to find someone who is able and willing to work on this?
>
As said, changing the core is trivial. A RFC patch is [0].
The problem is how to make sure that this change won't cause regressions
in existing drivers.
There was particularly tricky for the spi-nor driver, it doesn't help that
a lot of DT are using undocumented compatible strings (sometimes with no
vendor prefix). You can see the discussion here [1].
In the same thread Mark Brown said that it wasn't that bad to have the
information in the OF device ID table duplicated in a SPI device table.
Certainly isn't the best approach but IMHO is better than the module not
loading.
https://patchwork.kernel.org/patch/7041141/
https://patchwork.ozlabs.org/patch/545125/
> If not, I'd recommend to stay with the current level of optimality.
>
> BR and thanks,
> Nikolaus
>
Best regards,
--
Javier Martinez Canillas
Open Source Group
Samsung Research America
next prev parent reply other threads:[~2017-02-01 21:15 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-28 14:53 [PATCH v9 0/8] drivers: touchscreen: tsc2007 and ads7846/tsc2046 improvements (use common touchscreen bindings, pre-calibration, spi fix and provide iio raw values) H. Nikolaus Schaller
2016-12-28 14:53 ` [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation H. Nikolaus Schaller
2017-01-09 17:43 ` Rob Herring
2017-01-28 19:33 ` Dmitry Torokhov
2017-01-28 21:44 ` H. Nikolaus Schaller
2017-02-17 20:40 ` Dmitry Torokhov
2017-02-18 3:22 ` Sebastian Reichel
2017-02-18 11:33 ` H. Nikolaus Schaller
2017-02-18 23:44 ` Sebastian Reichel
2017-02-19 12:07 ` H. Nikolaus Schaller
2017-02-19 20:15 ` Sebastian Reichel
2017-02-20 16:49 ` H. Nikolaus Schaller
2017-02-18 7:45 ` [Letux-kernel] " Andreas Kemnade
2017-02-18 9:15 ` Pavel Machek
2017-02-18 11:33 ` H. Nikolaus Schaller
2017-02-18 18:08 ` Pavel Machek
2017-02-18 19:17 ` H. Nikolaus Schaller
2017-02-18 22:54 ` Pavel Machek
2017-02-19 12:05 ` H. Nikolaus Schaller
2017-02-19 14:17 ` Pavel Machek
2017-02-19 17:04 ` H. Nikolaus Schaller
2017-02-19 17:15 ` Pavel Machek
2017-02-19 17:51 ` H. Nikolaus Schaller
2017-02-19 19:05 ` Pavel Machek
2017-02-19 19:31 ` H. Nikolaus Schaller
2017-02-19 20:57 ` Pavel Machek
2017-02-19 22:01 ` H. Nikolaus Schaller
2017-02-19 22:19 ` Pavel Machek
2017-02-20 16:50 ` H. Nikolaus Schaller
2017-02-20 19:29 ` Pavel Machek
2017-02-20 20:20 ` H. Nikolaus Schaller
2017-02-20 22:26 ` Petr Cvek
2017-02-21 8:29 ` H. Nikolaus Schaller
2017-02-19 22:29 ` [Letux-kernel] " Andreas Kemnade
2017-02-19 22:39 ` Pavel Machek
2017-02-20 16:50 ` H. Nikolaus Schaller
2017-02-20 19:32 ` Pavel Machek
2017-02-20 20:22 ` H. Nikolaus Schaller
2017-02-20 20:50 ` H. Nikolaus Schaller
2017-02-18 11:32 ` H. Nikolaus Schaller
2017-02-20 1:07 ` Dmitry Torokhov
2017-02-20 16:50 ` H. Nikolaus Schaller
2017-02-20 19:42 ` Pali Rohár
2017-02-20 20:35 ` H. Nikolaus Schaller
2017-02-20 21:07 ` Pali Rohár
2017-02-20 21:24 ` H. Nikolaus Schaller
2017-02-20 21:54 ` Pali Rohár
2017-02-21 6:42 ` H. Nikolaus Schaller
2017-02-21 8:53 ` Pali Rohár
2017-02-20 21:08 ` Pali Rohár
2017-02-20 21:27 ` H. Nikolaus Schaller
2017-02-20 21:50 ` Dmitry Torokhov
2017-02-20 22:21 ` Petr Cvek
2017-02-20 22:24 ` Dmitry Torokhov
2017-02-21 6:56 ` H. Nikolaus Schaller
2017-02-20 22:45 ` Pali Rohár
2017-02-21 6:36 ` H. Nikolaus Schaller
2017-02-21 9:09 ` Pali Rohár
2017-02-21 17:07 ` [Letux-kernel] " Andreas Kemnade
2017-02-20 22:04 ` Pali Rohár
2017-02-21 6:49 ` H. Nikolaus Schaller
2017-02-21 7:14 ` H. Nikolaus Schaller
2017-02-21 8:47 ` Pali Rohár
2017-02-21 8:57 ` [Letux-kernel] " Christ van Willegen
2017-02-21 11:07 ` Pavel Machek
2016-12-28 14:53 ` [PATCH v9 2/8] drivers:input:tsc2007: check for presence and power down tsc2007 during probe H. Nikolaus Schaller
2017-02-17 20:52 ` Dmitry Torokhov
2016-12-28 14:53 ` [PATCH v9 3/8] DT:omap3+tsc2007: use new common touchscreen bindings H. Nikolaus Schaller
2016-12-28 14:53 ` [PATCH v9 4/8] drivers:input:ads7846(+tsc2046): add new common binding names, pre-calibration and flipping H. Nikolaus Schaller
2016-12-28 14:53 ` [PATCH v9 5/8] dt-bindings: input: move ads7846 bindings to touchscreen subdirectory H. Nikolaus Schaller
2017-02-23 9:54 ` H. Nikolaus Schaller
2016-12-28 14:53 ` [PATCH v9 6/8] drivers:input:ads7846(+tsc2046): fix spi module table H. Nikolaus Schaller
2017-01-28 19:35 ` Dmitry Torokhov
2017-01-29 8:39 ` H. Nikolaus Schaller
2017-01-29 18:01 ` Dmitry Torokhov
2017-01-29 18:25 ` H. Nikolaus Schaller
2017-02-01 20:20 ` H. Nikolaus Schaller
2017-02-01 21:14 ` Javier Martinez Canillas [this message]
2017-02-01 22:28 ` Dmitry Torokhov
2017-02-01 22:50 ` Javier Martinez Canillas
2017-02-02 5:47 ` H. Nikolaus Schaller
2016-12-28 14:53 ` [PATCH v9 7/8] DT:omap3+ads7846: use new common touchscreen bindings H. Nikolaus Schaller
2016-12-28 14:53 ` [PATCH v9 8/8] drivers:input:tsc2007: add iio interface to read external ADC input and temperature H. Nikolaus Schaller
2016-12-30 20:36 ` Jonathan Cameron
2017-02-17 21:27 ` Dmitry Torokhov
2017-02-18 11:35 ` H. Nikolaus Schaller
2017-01-16 6:34 ` [PATCH v9 0/8] drivers: touchscreen: tsc2007 and ads7846/tsc2046 improvements (use common touchscreen bindings, pre-calibration, spi fix and provide iio raw values) H. Nikolaus Schaller
2017-01-21 13:08 ` Jonathan Cameron
2017-01-21 13:17 ` H. Nikolaus Schaller
2017-01-28 18:16 ` [Letux-kernel] " H. Nikolaus Schaller
2017-02-12 15:18 ` H. Nikolaus Schaller
2017-02-15 14:03 ` H. Nikolaus Schaller
2017-02-17 20:43 ` Dmitry Torokhov
2017-02-18 11:30 ` H. Nikolaus Schaller
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