Re: Removal of regulator framework

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Em Wed, 23 Jul 2014 10:13:28 -0700
"Luis R. Rodriguez" <mcgrof@xxxxxxxxxxxxxxxx> escreveu:

> On Sat, Jul 19, 2014 at 9:19 AM, Hauke Mehrtens <hauke@xxxxxxxxxx> wrote:
> > Maintaining the regulator drivers in backports costs some time and I do
> > not need them. Is anybody using the regulator drivers from backports? I
> > would like to remove them.
> 
> That came simply from collateral of backporting media drivers,
> eventually I started running into device drivers that used the
> regulator framework. Since we have tons of media drivers perhaps the
> more sensible thing to do is to white list a set of media divers that
> people actually care and then we just nuke both regulator and media
> drivers that no one cares for. For that though I'd like to ask media
> folks.

Hi Luis,

The drivers that currently use regulators are mostly the ones at
drivers/media/platform, plus the corresponding I2C drivers for their
webcam sensors, under drivers/media/i2c.

I think that there's one exception though: em28xx. This driver can use
some sensor drivers, as it supports a few webcams. This is one of
the most used USB media driver, as there are lots of USB supported
on it, supporting 4 types of devices on it: analog TV, capture card,
digital TV and webcam.

The webcam part of em28xx is not that relevant, as there are very few
models using it. However, currently, it is not possible to just
disable webcam support. It shouldn't be hard to make webcam support
optional on it, as it has already sub-drivers for V4L2, DVB, ALSA and
remote controller. One additional driver for webcam, that could be
disabled at the backport tree shouldn't be hard to do. If you want it,
patches are welcome.

> Here's a list of media drivers I know SUSE does support, in case that
> helps. Right now backports carries all of drivers/media though.
> 
>                 drivers/media/common/btcx-risc                  # some
> code shared by bttv and cx88xx drivers
>                 drivers/media/common/cx2341x
>                 drivers/media/common/saa7146/saa7146
>                 drivers/media/common/saa7146/saa7146_vv
>                 drivers/media/common/tveeprom
>                 drivers/media/i2c/adv7170                       #
> Analog Devices ADV7170 video encoder driver
>                 drivers/media/i2c/adv7175                       #
> Analog Devices ADV7175 video encoder driver
>                 drivers/media/i2c/bt819                         #
> Brooktree-819 video decoder driver
>                 drivers/media/i2c/bt856                         #
> Brooktree-856A video encoder driver
>                 drivers/media/i2c/cs5345
>                 drivers/media/i2c/cs53l32a                      #
> cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver
>                 drivers/media/i2c/cx25840/cx25840               #
> Conexant CX25840 audio/video decoder driver
>                 drivers/media/i2c/ir-kbd-i2c                    #
> input driver for i2c IR remote controls
>                 drivers/media/i2c/ks0127
>                 drivers/media/i2c/m52790
>                 drivers/media/i2c/msp3400                       #
> device driver for msp34xx TV sound processor
>                 drivers/media/i2c/saa6588                       #
> Philips SAA6588 RDS decoder
>                 drivers/media/i2c/saa7110                       #
> Philips SAA7110 video decoder driver
>                 drivers/media/i2c/saa7115                       #
> Philips SAA7111/13/14/15/18 video decoder driver
>                 drivers/media/i2c/saa7127                       #
> Philips SAA7127/SAA7129 video encoder driver
>                 drivers/media/i2c/saa717x
>                 drivers/media/i2c/saa7185                       #
> Philips SAA7185 video encoder driver
>                 drivers/media/i2c/tda7432                       # bttv
> driver for the tda7432 audio processor chip
>                 drivers/media/i2c/tda9840
>                 drivers/media/i2c/tea6415c
>                 drivers/media/i2c/tea6420
>                 drivers/media/i2c/tvaudio                       #
> device driver for various i2c TV sound decoder / audiomux chips
>                 drivers/media/i2c/tvp5150                       #
> Texas Instruments TVP5150A(M) video decoder driver
>                 drivers/media/i2c/upd64031a
>                 drivers/media/i2c/upd64083
>                 drivers/media/i2c/vp27smpx
>                 drivers/media/i2c/vpx3220                       #
> vpx3220a/vpx3216b/vpx3214c video encoder driver
>                 drivers/media/i2c/wm8739
>                 drivers/media/i2c/wm8775
>                 drivers/media/pci/bt8xx/bttv
>                 drivers/media/pci/cx88/cx88-alsa
>                 drivers/media/pci/cx88/cx88-blackbird
>                 drivers/media/pci/cx88/cx8800
>                 drivers/media/pci/cx88/cx8802
>                 drivers/media/pci/cx88/cx88xx
>                 drivers/media/pci/ivtv/ivtv
>                 drivers/media/pci/ivtv/ivtvfb
>                 drivers/media/pci/meye/meye
>                 drivers/media/pci/saa7134/saa6752hs             #
> device driver for saa6752hs MPEG2 encoder
>                 drivers/media/pci/saa7134/saa7134
>                 drivers/media/pci/saa7134/saa7134-alsa
>                 drivers/media/pci/saa7134/saa7134-empress
>                 drivers/media/pci/saa7146/hexium_gemini
>                 drivers/media/pci/saa7146/hexium_orion
>                 drivers/media/pci/saa7146/mxb                   #
> video4linux-2 driver for the Siemens-Nixdorf 'Multimedia eXtension
> board'
>                 drivers/media/pci/zoran/videocodec              #
> Intermediate API module for video codecs
>                 drivers/media/pci/zoran/zr36016
>                 drivers/media/pci/zoran/zr36050
>                 drivers/media/pci/zoran/zr36060
>                 drivers/media/pci/zoran/zr36067
>                 drivers/media/platform/vivi
>                 drivers/media/radio/dsbr100
>                 drivers/media/radio/radio-maxiradio             #
> Radio driver for the Guillemot Maxi Radio FM2000 radio.
>                 drivers/media/radio/si470x/radio-usb-si470x
>                 drivers/media/radio/tea575x
>                 drivers/media/rc/ati_remote
>                 drivers/media/rc/rc_core
>                 drivers/media/rc/winbond-cir
>                 drivers/media/tuners/mt2060
>                 drivers/media/tuners/mt20xx
>                 drivers/media/tuners/mt2131
>                 drivers/media/tuners/mt2266
>                 drivers/media/tuners/mxl5005s
>                 drivers/media/tuners/mxl5007t
>                 drivers/media/tuners/qt1010
>                 drivers/media/tuners/tda18271
>                 drivers/media/tuners/tda827x
>                 drivers/media/tuners/tda8290
>                 drivers/media/tuners/tda9887
>                 drivers/media/tuners/tea5761
>                 drivers/media/tuners/tea5767
>                 drivers/media/tuners/tuner-simple
>                 drivers/media/tuners/tuner-types
>                 drivers/media/tuners/tuner-xc2028
>                 drivers/media/tuners/xc5000
>                 drivers/media/usb/em28xx/em28xx                 #
> driver for Empia EM2800/EM2820/2840 USB video capture device
>                 drivers/media/usb/em28xx/em28xx-alsa
>                 drivers/media/usb/usbvision/usbvision
>                 drivers/media/usb/uvc/uvcvideo
>                 drivers/media/v4l2-core/tuner                   #
> device driver for various TV and TV+FM radio tuners
>                 drivers/media/v4l2-core/v4l2-common
>                 drivers/media/v4l2-core/videobuf-core
>                 drivers/media/v4l2-core/videobuf-dma-sg
>                 drivers/media/v4l2-core/videobuf-vmalloc
>                 drivers/media/v4l2-core/videobuf2_core
>                 drivers/media/v4l2-core/videobuf2_memops
>                 drivers/media/v4l2-core/videobuf2_vmalloc
>                 drivers/media/v4l2-core/videodev                #
> Device registrar for Video4Linux drivers
> 
>  Luis
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