dt-bindings: connector: analog: add sdtv standards property

Some connectors no matter if in- or output supports only a limited
range of sdtv standards. 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@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
---
[1] https://patchwork.kernel.org/cover/10794703/

v10:
- fix typo s/TV_STD_*/SDTV_STD_*/

v8:
Hi Rob,

I dropped your r b tag becuase of the changes I made in this version.
Please can you have look on it again? Luckily this would be the last
time ;-)

- move definition to include/dt-bindings/display
- rename tvnorms.h to sdtv-standards.h
- TVORMS_* -> SDTV_STD_*
- add sync comments
- adapt commit message
- fix bindings documentation

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.

3 files changed, 86 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt b/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt
index 0c0970c210ab7..883bcb2604c7c 100644
--- a/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt
+++ b/Documentation/devicetree/bindings/display/connector/analog-tv-connector.txt
@@ -6,16 +6,22 @@ Required properties:
 
 Optional properties:
 - label: a symbolic name for the connector
+- sdtv-standards: limit the supported TV standards on a connector to the given
+                  ones. If not specified all TV standards are allowed.
+                  Possible TV standards are defined in
+                  include/dt-bindings/display/sdtv-standards.h.
 
 Required nodes:
 - Video port for TV input
 
 Example
 -------
+#include <dt-bindings/display/sdtv-standards.h>
 
 tv: connector {
 	compatible = "composite-video-connector";
 	label = "tv";
+	sdtv-standards = <(SDTV_STD_PAL | SDTV_STD_NTSC)>;
 
 	port {
 		tv_connector_in: endpoint {
diff --git a/include/dt-bindings/display/sdtv-standards.h b/include/dt-bindings/display/sdtv-standards.h
new file mode 100644
index 0000000000000..fbc1a3db2ea75
--- /dev/null
+++ b/include/dt-bindings/display/sdtv-standards.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0-only or X11 */
+/*
+ * Copyright 2019 Pengutronix, Marco Felsch <kernel@pengutronix.de>
+ */
+
+#ifndef _DT_BINDINGS_DISPLAY_SDTV_STDS_H
+#define _DT_BINDINGS_DISPLAY_SDTV_STDS_H
+
+/*
+ * Attention: Keep the SDTV_STD_* bit definitions in sync with
+ * include/uapi/linux/videodev2.h V4L2_STD_* bit definitions.
+ */
+/* One bit for each standard */
+#define SDTV_STD_PAL_B		0x00000001
+#define SDTV_STD_PAL_B1		0x00000002
+#define SDTV_STD_PAL_G		0x00000004
+#define SDTV_STD_PAL_H		0x00000008
+#define SDTV_STD_PAL_I		0x00000010
+#define SDTV_STD_PAL_D		0x00000020
+#define SDTV_STD_PAL_D1		0x00000040
+#define SDTV_STD_PAL_K		0x00000080
+
+#define SDTV_STD_PAL		(SDTV_STD_PAL_B		| \
+				 SDTV_STD_PAL_B1	| \
+				 SDTV_STD_PAL_G		| \
+				 SDTV_STD_PAL_H		| \
+				 SDTV_STD_PAL_I		| \
+				 SDTV_STD_PAL_D		| \
+				 SDTV_STD_PAL_D1	| \
+				 SDTV_STD_PAL_K)
+
+#define SDTV_STD_PAL_M		0x00000100
+#define SDTV_STD_PAL_N		0x00000200
+#define SDTV_STD_PAL_Nc		0x00000400
+#define SDTV_STD_PAL_60		0x00000800
+
+#define SDTV_STD_NTSC_M		0x00001000	/* BTSC */
+#define SDTV_STD_NTSC_M_JP	0x00002000	/* EIA-J */
+#define SDTV_STD_NTSC_443	0x00004000
+#define SDTV_STD_NTSC_M_KR	0x00008000	/* FM A2 */
+
+#define SDTV_STD_NTSC		(SDTV_STD_NTSC_M	| \
+				 SDTV_STD_NTSC_M_JP	| \
+				 SDTV_STD_NTSC_M_KR)
+
+#define SDTV_STD_SECAM_B	0x00010000
+#define SDTV_STD_SECAM_D	0x00020000
+#define SDTV_STD_SECAM_G	0x00040000
+#define SDTV_STD_SECAM_H	0x00080000
+#define SDTV_STD_SECAM_K	0x00100000
+#define SDTV_STD_SECAM_K1	0x00200000
+#define SDTV_STD_SECAM_L	0x00400000
+#define SDTV_STD_SECAM_LC	0x00800000
+
+#define SDTV_STD_SECAM		(SDTV_STD_SECAM_B	| \
+				 SDTV_STD_SECAM_D	| \
+				 SDTV_STD_SECAM_G	| \
+				 SDTV_STD_SECAM_H	| \
+				 SDTV_STD_SECAM_K	| \
+				 SDTV_STD_SECAM_K1	| \
+				 SDTV_STD_SECAM_L	| \
+				 SDTV_STD_SECAM_LC)
+
+/* Standards for Countries with 60Hz Line frequency */
+#define SDTV_STD_525_60		(SDTV_STD_PAL_M		| \
+				 SDTV_STD_PAL_60	| \
+				 SDTV_STD_NTSC		| \
+				 SDTV_STD_NTSC_443)
+
+/* Standards for Countries with 50Hz Line frequency */
+#define SDTV_STD_625_50		(SDTV_STD_PAL		| \
+				 SDTV_STD_PAL_N		| \
+				 SDTV_STD_PAL_Nc	| \
+				 SDTV_STD_SECAM)
+
+#endif /* _DT_BINDINGS_DISPLAY_SDTV_STDS_H */
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 530638dffd934..bc7acade02a01 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1208,6 +1208,10 @@ struct v4l2_selection {
 
 typedef __u64 v4l2_std_id;
 
+/*
+ * Attention: Keep the V4L2_STD_* bit definitions in sync with
+ * include/dt-bindings/display/sdtv-standards.h SDTV_STD_* bit definitions.
+ */
 /* one bit for each */
 #define V4L2_STD_PAL_B          ((v4l2_std_id)0x00000001)
 #define V4L2_STD_PAL_B1         ((v4l2_std_id)0x00000002)