~hc/RK356X_SDK_RELEASE.git

..	..	@@ -85,10 +85,374 @@
85	85
86	86	- lens-focus: A phandle to the node of the focus lens controller.
87	87
88		-- rotation: The device, typically an image sensor, is not mounted upright,
89		- but a number of degrees counter clockwise. Typical values are 0 and 180
90		- (upside down).
	88	+- rotation: The camera rotation is expressed as the angular difference in
	89	+ degrees between two reference systems, one relative to the camera module, and
	90	+ one defined on the external world scene to be captured when projected on the
	91	+ image sensor pixel array.
91	92
	93	+ A camera sensor has a 2-dimensional reference system 'Rc' defined by
	94	+ its pixel array read-out order. The origin is set to the first pixel
	95	+ being read out, the X-axis points along the column read-out direction
	96	+ towards the last columns, and the Y-axis along the row read-out
	97	+ direction towards the last row.
	98	+
	99	+ A typical example for a sensor with a 2592x1944 pixel array matrix
	100	+ observed from the front is:
	101	+
	102	+ 2591 X-axis 0
	103	+ <------------------------+ 0
	104	+ .......... ... ..........!
	105	+ .......... ... ..........! Y-axis
	106	+ ... !
	107	+ .......... ... ..........!
	108	+ .......... ... ..........! 1943
	109	+ V
	110	+
	111	+ The external world scene reference system 'Rs' is a 2-dimensional
	112	+ reference system on the focal plane of the camera module. The origin is
	113	+ placed on the top-left corner of the visible scene, the X-axis points
	114	+ towards the right, and the Y-axis points towards the bottom of the
	115	+ scene. The top, bottom, left and right directions are intentionally not
	116	+ defined and depend on the environment in which the camera is used.
	117	+
	118	+ A typical example of a (very common) picture of a shark swimming from
	119	+ left to right, as seen from the camera, is:
	120	+
	121	+ 0 X-axis
	122	+ 0 +------------------------------------->
	123	+ !
	124	+ !
	125	+ !
	126	+ ! \|\____)\___
	127	+ ! ) _____ __`<
	128	+ ! \|/ )/
	129	+ !
	130	+ !
	131	+ !
	132	+ V
	133	+ Y-axis
	134	+
	135	+ with the reference system 'Rs' placed on the camera focal plane:
	136	+
	137	+ ¸.·˙!
	138	+ ¸.·˙ !
	139	+ _ ¸.·˙ !
	140	+ +-/ \-+¸.·˙ !
	141	+ \| (o) \| ! Camera focal plane
	142	+ +-----+˙·.¸ !
	143	+ ˙·.¸ !
	144	+ ˙·.¸ !
	145	+ ˙·.¸!
	146	+
	147	+ When projected on the sensor's pixel array, the image and the associated
	148	+ reference system 'Rs' are typically (but not always) inverted, due to
	149	+ the camera module's lens optical inversion effect.
	150	+
	151	+ Assuming the above represented scene of the swimming shark, the lens
	152	+ inversion projects the scene and its reference system onto the sensor
	153	+ pixel array, seen from the front of the camera sensor, as follows:
	154	+
	155	+ Y-axis
	156	+ ^
	157	+ !
	158	+ !
	159	+ !
	160	+ ! \|\_____)\__
	161	+ ! ) ____ ___.<
	162	+ ! \|/ )/
	163	+ !
	164	+ !
	165	+ !
	166	+ 0 +------------------------------------->
	167	+ 0 X-axis
	168	+
	169	+ Note the shark being upside-down.
	170	+
	171	+ The resulting projected reference system is named 'Rp'.
	172	+
	173	+ The camera rotation property is then defined as the angular difference
	174	+ in the counter-clockwise direction between the camera reference system
	175	+ 'Rc' and the projected scene reference system 'Rp'. It is expressed in
	176	+ degrees as a number in the range [0, 360[.
	177	+
	178	+ Examples
	179	+
	180	+ 0 degrees camera rotation:
	181	+
	182	+
	183	+ Y-Rp
	184	+ ^
	185	+ Y-Rc !
	186	+ ^ !
	187	+ ! !
	188	+ ! !
	189	+ ! !
	190	+ ! !
	191	+ ! !
	192	+ ! !
	193	+ ! !
	194	+ ! 0 +------------------------------------->
	195	+ ! 0 X-Rp
	196	+ 0 +------------------------------------->
	197	+ 0 X-Rc
	198	+
	199	+
	200	+ X-Rc 0
	201	+ <------------------------------------+ 0
	202	+ X-Rp 0 !
	203	+ <------------------------------------+ 0 !
	204	+ ! !
	205	+ ! !
	206	+ ! !
	207	+ ! !
	208	+ ! !
	209	+ ! !
	210	+ ! !
	211	+ ! V
	212	+ ! Y-Rc
	213	+ V
	214	+ Y-Rp
	215	+
	216	+ 90 degrees camera rotation:
	217	+
	218	+ 0 Y-Rc
	219	+ 0 +-------------------->
	220	+ ! Y-Rp
	221	+ ! ^
	222	+ ! !
	223	+ ! !
	224	+ ! !
	225	+ ! !
	226	+ ! !
	227	+ ! !
	228	+ ! !
	229	+ ! !
	230	+ ! !
	231	+ ! 0 +------------------------------------->
	232	+ ! 0 X-Rp
	233	+ !
	234	+ !
	235	+ !
	236	+ !
	237	+ V
	238	+ X-Rc
	239	+
	240	+ 180 degrees camera rotation:
	241	+
	242	+ 0
	243	+ <------------------------------------+ 0
	244	+ X-Rc !
	245	+ Y-Rp !
	246	+ ^ !
	247	+ ! !
	248	+ ! !
	249	+ ! !
	250	+ ! !
	251	+ ! !
	252	+ ! !
	253	+ ! V
	254	+ ! Y-Rc
	255	+ 0 +------------------------------------->
	256	+ 0 X-Rp
	257	+
	258	+ 270 degrees camera rotation:
	259	+
	260	+ 0 Y-Rc
	261	+ 0 +-------------------->
	262	+ ! 0
	263	+ ! <-----------------------------------+ 0
	264	+ ! X-Rp !
	265	+ ! !
	266	+ ! !
	267	+ ! !
	268	+ ! !
	269	+ ! !
	270	+ ! !
	271	+ ! !
	272	+ ! !
	273	+ ! V
	274	+ ! Y-Rp
	275	+ !
	276	+ !
	277	+ !
	278	+ !
	279	+ V
	280	+ X-Rc
	281	+
	282	+
	283	+ Example one - Webcam
	284	+
	285	+ A camera module installed on the user facing part of a laptop screen
	286	+ casing used for video calls. The captured images are meant to be
	287	+ displayed in landscape mode (width > height) on the laptop screen.
	288	+
	289	+ The camera is typically mounted upside-down to compensate the lens
	290	+ optical inversion effect:
	291	+
	292	+ Y-Rp
	293	+ Y-Rc ^
	294	+ ^ !
	295	+ ! !
	296	+ ! ! \|\_____)\__
	297	+ ! ! ) ____ ___.<
	298	+ ! ! \|/ )/
	299	+ ! !
	300	+ ! !
	301	+ ! !
	302	+ ! 0 +------------------------------------->
	303	+ ! 0 X-Rp
	304	+ 0 +------------------------------------->
	305	+ 0 X-Rc
	306	+
	307	+ The two reference systems are aligned, the resulting camera rotation is
	308	+ 0 degrees, no rotation correction needs to be applied to the resulting
	309	+ image once captured to memory buffers to correctly display it to users:
	310	+
	311	+ +--------------------------------------+
	312	+ ! !
	313	+ ! !
	314	+ ! !
	315	+ ! \|\____)\___ !
	316	+ ! ) _____ __`< !
	317	+ ! \|/ )/ !
	318	+ ! !
	319	+ ! !
	320	+ ! !
	321	+ +--------------------------------------+
	322	+
	323	+ If the camera sensor is not mounted upside-down to compensate for the
	324	+ lens optical inversion, the two reference systems will not be aligned,
	325	+ with 'Rp' being rotated 180 degrees relatively to 'Rc':
	326	+
	327	+
	328	+ X-Rc 0
	329	+ <------------------------------------+ 0
	330	+ !
	331	+ Y-Rp !
	332	+ ^ !
	333	+ ! !
	334	+ ! \|\_____)\__ !
	335	+ ! ) ____ ___.< !
	336	+ ! \|/ )/ !
	337	+ ! !
	338	+ ! !
	339	+ ! V
	340	+ ! Y-Rc
	341	+ 0 +------------------------------------->
	342	+ 0 X-Rp
	343	+
	344	+ The image once captured to memory will then be rotated by 180 degrees:
	345	+
	346	+ +--------------------------------------+
	347	+ ! !
	348	+ ! !
	349	+ ! !
	350	+ ! __/(_____/\| !
	351	+ ! >.___ ____ ( !
	352	+ ! \( \\| !
	353	+ ! !
	354	+ ! !
	355	+ ! !
	356	+ +--------------------------------------+
	357	+
	358	+ A software rotation correction of 180 degrees should be applied to
	359	+ correctly display the image:
	360	+
	361	+ +--------------------------------------+
	362	+ ! !
	363	+ ! !
	364	+ ! !
	365	+ ! \|\____)\___ !
	366	+ ! ) _____ __`< !
	367	+ ! \|/ )/ !
	368	+ ! !
	369	+ ! !
	370	+ ! !
	371	+ +--------------------------------------+
	372	+
	373	+ Example two - Phone camera
	374	+
	375	+ A camera installed on the back side of a mobile device facing away from
	376	+ the user. The captured images are meant to be displayed in portrait mode
	377	+ (height > width) to match the device screen orientation and the device
	378	+ usage orientation used when taking the picture.
	379	+
	380	+ The camera sensor is typically mounted with its pixel array longer side
	381	+ aligned to the device longer side, upside-down mounted to compensate for
	382	+ the lens optical inversion effect:
	383	+
	384	+ 0 Y-Rc
	385	+ 0 +-------------------->
	386	+ ! Y-Rp
	387	+ ! ^
	388	+ ! !
	389	+ ! !
	390	+ ! !
	391	+ ! ! \|\_____)\__
	392	+ ! ! ) ____ ___.<
	393	+ ! ! \|/ )/
	394	+ ! !
	395	+ ! !
	396	+ ! !
	397	+ ! 0 +------------------------------------->
	398	+ ! 0 X-Rp
	399	+ !
	400	+ !
	401	+ !
	402	+ !
	403	+ V
	404	+ X-Rc
	405	+
	406	+ The two reference systems are not aligned and the 'Rp' reference
	407	+ system is rotated by 90 degrees in the counter-clockwise direction
	408	+ relatively to the 'Rc' reference system.
	409	+
	410	+ The image once captured to memory will be rotated:
	411	+
	412	+ +-------------------------------------+
	413	+ \| _ _ \|
	414	+ \| \ / \|
	415	+ \| \| \| \|
	416	+ \| \| \| \|
	417	+ \| \| > \|
	418	+ \| < \| \|
	419	+ \| \| \| \|
	420	+ \| . \|
	421	+ \| V \|
	422	+ +-------------------------------------+
	423	+
	424	+ A correction of 90 degrees in counter-clockwise direction has to be
	425	+ applied to correctly display the image in portrait mode on the device
	426	+ screen:
	427	+
	428	+ +--------------------+
	429	+ \| \|
	430	+ \| \|
	431	+ \| \|
	432	+ \| \|
	433	+ \| \|
	434	+ \| \|
	435	+ \| \|\____)\___ \|
	436	+ \| ) _____ __`< \|
	437	+ \| \|/ )/ \|
	438	+ \| \|
	439	+ \| \|
	440	+ \| \|
	441	+ \| \|
	442	+ \| \|
	443	+ +--------------------+
	444	+
	445	+- orientation: The orientation of a device (typically an image sensor or a flash
	446	+ LED) describing its mounting position relative to the usage orientation of the
	447	+ system where the device is installed on.
	448	+ Possible values are:
	449	+ 0 - Front. The device is mounted on the front facing side of the system.
	450	+ For mobile devices such as smartphones, tablets and laptops the front side is
	451	+ the user facing side.
	452	+ 1 - Back. The device is mounted on the back side of the system, which is
	453	+ defined as the opposite side of the front facing one.
	454	+ 2 - External. The device is not attached directly to the system but is
	455	+ attached in a way that allows it to move freely.
92	456
93	457	Optional endpoint properties
94	458	----------------------------
..	..	@@ -100,10 +464,12 @@
100	464	slave device (data source) by the master device (data sink). In the master
101	465	mode the data source device is also the source of the synchronization signals.
102	466	- bus-type: data bus type. Possible values are:
103		- 0 - autodetect based on other properties (MIPI CSI-2 D-PHY, parallel or Bt656)
104	467	1 - MIPI CSI-2 C-PHY
105	468	2 - MIPI CSI1
106	469	3 - CCP2
	470	+ 4 - MIPI CSI-2 D-PHY
	471	+ 5 - Parallel
	472	+ 6 - Bt.656
107	473	- bus-width: number of data lines actively used, valid for the parallel busses.
108	474	- data-shift: on the parallel data busses, if bus-width is used to specify the
109	475	number of data lines, data-shift can be used to specify which data lines are