On Wed, Sep 02, 2015 at 08:05:47AM -0600, Simon Glass wrote: > Hi, > > On 2 September 2015 at 03:44, Bin Meng <bmeng...@gmail.com> wrote: > > On Mon, Aug 17, 2015 at 1:09 PM, Bin Meng <bmeng...@gmail.com> wrote: > >> Hi, > >> > >> I plan to send a patch to remove the DEV_FLAGS_SYSTEM and > >> DEV_EXT_VIDEO. They look useless to me. For example, > >> > >> $ grep -nr DEV_FLAGS_SYSTEM * > >> arch/blackfin/cpu/jtag-console.c:186: dev.flags = DEV_FLAGS_OUTPUT | > >> DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; > >> board/bf527-ezkit/video.c:442: videodev.flags = DEV_FLAGS_SYSTEM; > >> /* No Output */ > >> board/kosagi/novena/novena.c:80: .flags = > >> DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM, > >> board/cm-bf548/video.c:336: videodev.flags = DEV_FLAGS_SYSTEM; > >> /* No Output */ > >> board/mpl/common/kbd.c:206: kbddev.flags = DEV_FLAGS_INPUT | > >> DEV_FLAGS_SYSTEM; > >> board/mpl/pati/pati.c:569: pci_con_dev.flags = DEV_FLAGS_OUTPUT | > >> DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; > >> board/bf548-ezkit/video.c:332: videodev.flags = DEV_FLAGS_SYSTEM; > >> /* No Output */ > >> board/bf533-stamp/video.c:168: videodev.flags = DEV_FLAGS_SYSTEM; > >> common/cmd_console.c:33: (dev->flags & > >> DEV_FLAGS_SYSTEM) ? 'S' : '.', > >> common/usb_kbd.c:505: usb_kbd_dev.flags = DEV_FLAGS_INPUT | > >> DEV_FLAGS_SYSTEM; > >> common/stdio.c:91: dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT > >> | DEV_FLAGS_SYSTEM; > >> common/stdio.c:102: dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT > >> | DEV_FLAGS_SYSTEM; > >> drivers/input/cros_ec_keyb.c:261: dev.flags = DEV_FLAGS_INPUT | > >> DEV_FLAGS_SYSTEM; > >> drivers/input/tegra-kbc.c:361: dev.flags = DEV_FLAGS_INPUT | > >> DEV_FLAGS_SYSTEM; > >> drivers/input/keyboard.c:277: kbddev.flags = DEV_FLAGS_INPUT | > >> DEV_FLAGS_SYSTEM; > >> drivers/video/cfb_console.c:2296: console_dev.flags = > >> DEV_FLAGS_OUTPUT | DEV_FLAGS_SYSTEM; > >> drivers/net/netconsole.c:325: dev.flags = DEV_FLAGS_OUTPUT | > >> DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; > >> include/stdio_dev.h:19:#define DEV_FLAGS_SYSTEM 0x80000000 /* > >> Device is a system device */ > >> > >> Except for this one below which tests the flag and prints an 'S', > >> common/cmd_console.c:33: (dev->flags & > >> DEV_FLAGS_SYSTEM) ? 'S' : '.', > >> > >> I don't see any actual meaning of this flag. I wonder if someone on > >> the mailing list knows the history. > >> > >> Also I noticed that several blackfin boards' video driver only set > >> this flag without setting DEV_FLAGS_OUTPUT. > >> > >> board/bf527-ezkit/video.c:442: videodev.flags = DEV_FLAGS_SYSTEM; > >> /* No Output */ > >> board/cm-bf548/video.c:336: videodev.flags = DEV_FLAGS_SYSTEM; > >> /* No Output */ > >> board/bf548-ezkit/video.c:332: videodev.flags = DEV_FLAGS_SYSTEM; > >> /* No Output */ > >> board/bf533-stamp/video.c:168: videodev.flags = DEV_FLAGS_SYSTEM; > >> > >> I wonder these video drivers are not used for system output purpose? > >> > > > > Ping? > > This is from the dawn of time and I don't see any purpose still remaining.
Sounds reasonable. -- Tom
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