Hi Hans, On 19-08-16 13:11, Hans Verkuil wrote: > On 8/15/19 1:57 PM, Marco Felsch wrote: > > Some connectors no matter if in- or output supports only a limited > > range of tv norms. It doesn't matter if the hardware behind that > > connector supports more than the listed formats since the users are > > restriced by a label e.g. to plug only a camera into this connector > > which uses the PAL format. > > > > This patch adds the capability to describe such limitation within the > > firmware. There are no format restrictions if the property isn't > > present, so it's completely backward compatible. > > > > Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx> > > Reviewed-by: Rob Herring <robh@xxxxxxxxxx> > > --- > > [1] https://patchwork.kernel.org/cover/10794703/ > > > > v7: > > I kept Robs r b tag because I only changed the example and extended > > TVNORM_* macros. > > > > - fix some style issues > > - add TVNORM_NTSC, TVNORM_525_60 and TVNORM_625_50 > > > > v6: > > - tvnorms.h: use tabs instead of spaces > > - tvnorms.h: add TVNORM_PAL and TVNORM_SECAM > > - tvnorms.h: drop rarely used TVNORM_ATSC_* norms > > > > v2-v4: > > - nothing since the patch was squashed from series [1] into this > > series. > > --- > > .../display/connector/analog-tv-connector.txt | 4 ++ > > include/dt-bindings/media/tvnorms.h | 72 +++++++++++++++++++ > > 2 files changed, 76 insertions(+) > > create mode 100644 include/dt-bindings/media/tvnorms.h > > > > diff --git a/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt b/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt > > index 0c0970c210ab..434e8aa0398b 100644 > > --- a/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt > > +++ b/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt > > @@ -6,6 +6,9 @@ Required properties: > > > > Optional properties: > > - label: a symbolic name for the connector > > +- tvnorms: limit the supported tv norms on a connector to the given ones else > > tv -> TV > > > + all tv norms are allowed. Possible video standards are defined in > > tv -> TV Changed both thanks. > And a more high-level question: I think tvnorm is a very vague name. It's a term > used in media, but what does 'norm' mean anyway? 'tv_standards' or 'video_standards' > would be a lot more descriptive. I'm with you *_standards would be more descriptive. Now the question is: is it a video or a tv standard? Wikipedia says that SECAM, PAL, NTSC is a television standard. So I prefer the 'tv_standards' or better the 'tv-standards' approach. > 'tvnorm' is, I think, a term used only internally in the media subsystem for no > clear reason. In the V4L2 spec it talks about 'video standard'. > > Sorry for being so late with raising this issue. > > > + include/dt-bindings/media/tvnorms.h. > > > > Required nodes: > > - Video port for TV input > > @@ -16,6 +19,7 @@ Example > > tv: connector { > > compatible = "composite-video-connector"; > > label = "tv"; > > + tvnorms = <(TVNORM_PAL | TVNORM_NTSC)>; > > > > port { > > tv_connector_in: endpoint { > > diff --git a/include/dt-bindings/media/tvnorms.h b/include/dt-bindings/media/tvnorms.h > > new file mode 100644 > > index 000000000000..e1275673c4d6 > > --- /dev/null > > +++ b/include/dt-bindings/media/tvnorms.h > > @@ -0,0 +1,72 @@ > > +/* SPDX-License-Identifier: GPL-2.0-only or X11 */ > > +/* > > + * Copyright 2019 Pengutronix, Marco Felsch <kernel@xxxxxxxxxxxxxx> > > + */ > > + > > +#ifndef _DT_BINDINGS_MEDIA_TVNORMS_H > > +#define _DT_BINDINGS_MEDIA_TVNORMS_H > > + > > +/* One bit for each standard */ > > I would add a comment here and in videodev2.h where you mention that > the two headers should remain in sync. Yes, good point. > > +#define TVNORM_PAL_B 0x00000001 > > +#define TVNORM_PAL_B1 0x00000002 > > +#define TVNORM_PAL_G 0x00000004 > > +#define TVNORM_PAL_H 0x00000008 > > +#define TVNORM_PAL_I 0x00000010 > > +#define TVNORM_PAL_D 0x00000020 > > +#define TVNORM_PAL_D1 0x00000040 > > +#define TVNORM_PAL_K 0x00000080 > > + > > +#define TVNORM_PAL (TVNORM_PAL_B | \ > > + TVNORM_PAL_B1 | \ > > + TVNORM_PAL_G | \ > > + TVNORM_PAL_H | \ > > + TVNORM_PAL_I | \ > > + TVNORM_PAL_D | \ > > + TVNORM_PAL_D1 | \ > > + TVNORM_PAL_K) > > + > > +#define TVNORM_PAL_M 0x00000100 > > +#define TVNORM_PAL_N 0x00000200 > > +#define TVNORM_PAL_Nc 0x00000400 > > +#define TVNORM_PAL_60 0x00000800 > > + > > +#define TVNORM_NTSC_M 0x00001000 /* BTSC */ > > +#define TVNORM_NTSC_M_JP 0x00002000 /* EIA-J */ > > +#define TVNORM_NTSC_443 0x00004000 > > +#define TVNORM_NTSC_M_KR 0x00008000 /* FM A2 */ > > + > > +#define TVNORM_NTSC (TVNORM_NTSC_M |\ > > + TVNORM_NTSC_M_JP |\ > > Add space before \ > > > + TVNORM_NTSC_M_KR) > > + > > +#define TVNORM_SECAM_B 0x00010000 > > +#define TVNORM_SECAM_D 0x00020000 > > +#define TVNORM_SECAM_G 0x00040000 > > +#define TVNORM_SECAM_H 0x00080000 > > +#define TVNORM_SECAM_K 0x00100000 > > +#define TVNORM_SECAM_K1 0x00200000 > > +#define TVNORM_SECAM_L 0x00400000 > > +#define TVNORM_SECAM_LC 0x00800000 > > + > > +#define TVNORM_SECAM (TVNORM_SECAM_B | \ > > + TVNORM_SECAM_D | \ > > + TVNORM_SECAM_G | \ > > + TVNORM_SECAM_H | \ > > + TVNORM_SECAM_K | \ > > + TVNORM_SECAM_K1 | \ > > + TVNORM_SECAM_L | \ > > + TVNORM_SECAM_LC) > > + > > +/* Standards for Countries with 60Hz Line frequency */ > > +#define TVNORM_525_60 (TVNORM_PAL_M | \ > > + TVNORM_PAL_60 | \ > > + TVNORM_NTSC | \ > > + TVNORM_NTSC_443) > > + > > +/* Standards for Countries with 50Hz Line frequency */ > > +#define TVNORM_625_50 (TVNORM_PAL |\ > > + TVNORM_PAL_N |\ > > + TVNORM_PAL_Nc |\ > > Add space before \ Both space errors fixed. > > + TVNORM_SECAM) > > + > > +#endif /* _DT_BINDINGS_MEDIA_TVNORMS_H */ > > > > I was also wondering if this header shouldn't be in include/dt-bindings/display/ > since the bindings are also described in 'display'. That's a good one and I really don't know which is the 'right' place for it. Since the standard has nothing to do with a display I would keep it within media. But the radeon [1] gpu uses the stds too. So I really don't know which place is better. [1] drivers/gpu/drm/radeon/radeon_mode.h. Regards, Marco > Regards, > > Hans > -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
