1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
|
From fff71f293b81ea6aa254397236484437b491ed9c Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 8 Feb 2016 09:46:33 +0000
Subject: [PATCH] BCM270X_DT: Adjust overlay README formatting
---
arch/arm/boot/dts/overlays/README | 414 +++++++++++++++++++-------------------
1 file changed, 207 insertions(+), 207 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -83,58 +83,58 @@ Name: <The base DTB>
Info: Configures the base Raspberry Pi hardware
Load: <loaded automatically>
Params:
- audio Set to "on" to enable the onboard ALSA audio
- interface (default "off")
+ audio Set to "on" to enable the onboard ALSA audio
+ interface (default "off")
- i2c_arm Set to "on" to enable the ARM's i2c interface
- (default "off")
+ i2c_arm Set to "on" to enable the ARM's i2c interface
+ (default "off")
- i2c_vc Set to "on" to enable the i2c interface
- usually reserved for the VideoCore processor
- (default "off")
+ i2c_vc Set to "on" to enable the i2c interface
+ usually reserved for the VideoCore processor
+ (default "off")
- i2c An alias for i2c_arm
+ i2c An alias for i2c_arm
- i2c_arm_baudrate Set the baudrate of the ARM's i2c interface
- (default "100000")
+ i2c_arm_baudrate Set the baudrate of the ARM's i2c interface
+ (default "100000")
- i2c_vc_baudrate Set the baudrate of the VideoCore i2c interface
- (default "100000")
+ i2c_vc_baudrate Set the baudrate of the VideoCore i2c interface
+ (default "100000")
- i2c_baudrate An alias for i2c_arm_baudrate
+ i2c_baudrate An alias for i2c_arm_baudrate
- i2s Set to "on" to enable the i2s interface
- (default "off")
+ i2s Set to "on" to enable the i2s interface
+ (default "off")
- spi Set to "on" to enable the spi interfaces
- (default "off")
+ spi Set to "on" to enable the spi interfaces
+ (default "off")
- random Set to "on" to enable the hardware random
- number generator (default "on")
+ random Set to "on" to enable the hardware random
+ number generator (default "on")
- uart0 Set to "off" to disable uart0 (default "on")
+ uart0 Set to "off" to disable uart0 (default "on")
- watchdog Set to "on" to enable the hardware watchdog
- (default "off")
+ watchdog Set to "on" to enable the hardware watchdog
+ (default "off")
- act_led_trigger Choose which activity the LED tracks.
- Use "heartbeat" for a nice load indicator.
- (default "mmc")
+ act_led_trigger Choose which activity the LED tracks.
+ Use "heartbeat" for a nice load indicator.
+ (default "mmc")
- act_led_activelow Set to "on" to invert the sense of the LED
- (default "off")
+ act_led_activelow Set to "on" to invert the sense of the LED
+ (default "off")
- act_led_gpio Set which GPIO to use for the activity LED
- (in case you want to connect it to an external
- device)
- (default "16" on a non-Plus board, "47" on a
- Plus or Pi 2)
+ act_led_gpio Set which GPIO to use for the activity LED
+ (in case you want to connect it to an external
+ device)
+ (default "16" on a non-Plus board, "47" on a
+ Plus or Pi 2)
pwr_led_trigger
pwr_led_activelow
pwr_led_gpio
- As for act_led_*, but using the PWR LED.
- Not available on Model A/B boards.
+ As for act_led_*, but using the PWR LED.
+ Not available on Model A/B boards.
N.B. It is recommended to only enable those interfaces that are needed.
Leaving all interfaces enabled can lead to unwanted behaviour (i2c_vc
@@ -149,19 +149,19 @@ Params:
Name: ads7846
Info: ADS7846 Touch controller
Load: dtoverlay=ads7846,<param>=<val>
-Params: cs SPI bus Chip Select (default 1)
- speed SPI bus speed (default 2MHz, max 3.25MHz)
- penirq GPIO used for PENIRQ. REQUIRED
- penirq_pull Set GPIO pull (default 0=none, 2=pullup)
- swapxy Swap x and y axis
- xmin Minimum value on the X axis (default 0)
- ymin Minimum value on the Y axis (default 0)
- xmax Maximum value on the X axis (default 4095)
- ymax Maximum value on the Y axis (default 4095)
- pmin Minimum reported pressure value (default 0)
- pmax Maximum reported pressure value (default 65535)
- xohms Touchpanel sensitivity (X-plate resistance)
- (default 400)
+Params: cs SPI bus Chip Select (default 1)
+ speed SPI bus speed (default 2MHz, max 3.25MHz)
+ penirq GPIO used for PENIRQ. REQUIRED
+ penirq_pull Set GPIO pull (default 0=none, 2=pullup)
+ swapxy Swap x and y axis
+ xmin Minimum value on the X axis (default 0)
+ ymin Minimum value on the Y axis (default 0)
+ xmax Maximum value on the X axis (default 4095)
+ ymax Maximum value on the Y axis (default 4095)
+ pmin Minimum reported pressure value (default 0)
+ pmax Maximum reported pressure value (default 65535)
+ xohms Touchpanel sensitivity (X-plate resistance)
+ (default 400)
penirq is required and usually xohms (60-100) has to be set as well.
Apart from that, pmax (255) and swapxy are also common.
@@ -175,12 +175,12 @@ Name: at86rf233
Info: Configures the Atmel AT86RF233 802.15.4 low-power WPAN transceiver,
connected to spi0.0
Load: dtoverlay=at86rf233,<param>=<val>
-Params: interrupt GPIO used for INT (default 23)
- reset GPIO used for Reset (default 24)
- sleep GPIO used for Sleep (default 25)
- speed SPI bus speed in Hz (default 6000000)
- trim Fine tuning of the internal capacitance
- arrays (0=+0pF, 15=+4.5pF, default 15)
+Params: interrupt GPIO used for INT (default 23)
+ reset GPIO used for Reset (default 24)
+ sleep GPIO used for Sleep (default 25)
+ speed SPI bus speed in Hz (default 6000000)
+ trim Fine tuning of the internal capacitance
+ arrays (0=+0pF, 15=+4.5pF, default 15)
Name: bmp085_i2c-sensor
@@ -194,8 +194,8 @@ Name: dht11
Info: Overlay for the DHT11/DHT21/DHT22 humidity/temperature sensors
Also sometimes found with the part number(s) AM230x.
Load: dtoverlay=dht11,<param>=<val>
-Params: gpiopin GPIO connected to the sensor's DATA output.
- (default 4)
+Params: gpiopin GPIO connected to the sensor's DATA output.
+ (default 4)
Name: dwc-otg
@@ -208,15 +208,15 @@ Params: <None>
Name: dwc2
Info: Selects the dwc2 USB controller driver
Load: dtoverlay=dwc2,<param>=<val>
-Params: dr_mode Dual role mode: "host", "peripheral" or "otg"
+Params: dr_mode Dual role mode: "host", "peripheral" or "otg"
- g-rx-fifo-size Size of rx fifo size in gadget mode
+ g-rx-fifo-size Size of rx fifo size in gadget mode
- g-np-tx-fifo-size Size of non-periodic tx fifo size in gadget
- mode
+ g-np-tx-fifo-size Size of non-periodic tx fifo size in gadget
+ mode
- g-tx-fifo-size Size of periodic tx fifo per endpoint
- (except ep0) in gadget mode
+ g-tx-fifo-size Size of periodic tx fifo per endpoint
+ (except ep0) in gadget mode
[ The ds1307-rtc overlay has been deleted. See i2c-rtc. ]
@@ -225,9 +225,9 @@ Params: dr_mode Dual ro
Name: enc28j60
Info: Overlay for the Microchip ENC28J60 Ethernet Controller (SPI)
Load: dtoverlay=enc28j60,<param>=<val>
-Params: int_pin GPIO used for INT (default 25)
+Params: int_pin GPIO used for INT (default 25)
- speed SPI bus speed (default 12000000)
+ speed SPI bus speed (default 12000000)
Name: gpio-ir
@@ -237,26 +237,26 @@ Info: Use GPIO pin as rc-core style in
not required! The key mapping and other decoding parameters can be
configured by "ir-keytable" tool.
Load: dtoverlay=gpio-ir,<param>=<val>
-Params: gpio_pin Input pin number. Default is 18.
+Params: gpio_pin Input pin number. Default is 18.
- gpio_pull Desired pull-up/down state (off, down, up)
- Default is "down".
+ gpio_pull Desired pull-up/down state (off, down, up)
+ Default is "down".
- rc-map-name Default rc keymap (can also be changed by
- ir-keytable), defaults to "rc-rc6-mce"
+ rc-map-name Default rc keymap (can also be changed by
+ ir-keytable), defaults to "rc-rc6-mce"
Name: gpio-poweroff
Info: Drives a GPIO high or low on reboot
Load: dtoverlay=gpio-poweroff,<param>=<val>
-Params: gpiopin GPIO for signalling (default 26)
+Params: gpiopin GPIO for signalling (default 26)
- active_low Set if the power control device requires a
- high->low transition to trigger a power-down.
- Note that this will require the support of a
- custom dt-blob.bin to prevent a power-down
- during the boot process, and that a reboot
- will also cause the pin to go low.
+ active_low Set if the power control device requires a
+ high->low transition to trigger a power-down.
+ Note that this will require the support of a
+ custom dt-blob.bin to prevent a power-down
+ during the boot process, and that a reboot
+ will also cause the pin to go low.
Name: hifiberry-amp
@@ -300,65 +300,65 @@ Name: hy28a
Info: HY28A - 2.8" TFT LCD Display Module by HAOYU Electronics
Default values match Texy's display shield
Load: dtoverlay=hy28a,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- xohms Touchpanel sensitivity (X-plate resistance)
+ xohms Touchpanel sensitivity (X-plate resistance)
- resetgpio GPIO used to reset controller
+ resetgpio GPIO used to reset controller
- ledgpio GPIO used to control backlight
+ ledgpio GPIO used to control backlight
Name: hy28b
Info: HY28B - 2.8" TFT LCD Display Module by HAOYU Electronics
Default values match Texy's display shield
Load: dtoverlay=hy28b,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- xohms Touchpanel sensitivity (X-plate resistance)
+ xohms Touchpanel sensitivity (X-plate resistance)
- resetgpio GPIO used to reset controller
+ resetgpio GPIO used to reset controller
- ledgpio GPIO used to control backlight
+ ledgpio GPIO used to control backlight
Name: i2c-gpio
Info: Adds support for software i2c controller on gpio pins
Load: dtoverlay=i2c-gpio,<param>=<val>
-Params: i2c_gpio_sda GPIO used for I2C data (default "23")
+Params: i2c_gpio_sda GPIO used for I2C data (default "23")
- i2c_gpio_scl GPIO used for I2C clock (default "24")
+ i2c_gpio_scl GPIO used for I2C clock (default "24")
- i2c_gpio_delay_us Clock delay in microseconds
- (default "2" = ~100kHz)
+ i2c_gpio_delay_us Clock delay in microseconds
+ (default "2" = ~100kHz)
Name: i2c-rtc
Info: Adds support for a number of I2C Real Time Clock devices
Load: dtoverlay=i2c-rtc,<param>=<val>
-Params: ds1307 Select the DS1307 device
+Params: ds1307 Select the DS1307 device
- ds3231 Select the DS3231 device
+ ds3231 Select the DS3231 device
- mcp7941x Select the MCP7941x device
+ mcp7941x Select the MCP7941x device
- pcf2127 Select the PCF2127 device
+ pcf2127 Select the PCF2127 device
- pcf8523 Select the PCF8523 device
+ pcf8523 Select the PCF8523 device
- pcf8563 Select the PCF8563 device
+ pcf8563 Select the PCF8563 device
Name: i2s-mmap
@@ -396,70 +396,70 @@ Name: lirc-rpi
Info: Configures lirc-rpi (Linux Infrared Remote Control for Raspberry Pi)
Consult the module documentation for more details.
Load: dtoverlay=lirc-rpi,<param>=<val>
-Params: gpio_out_pin GPIO for output (default "17")
+Params: gpio_out_pin GPIO for output (default "17")
- gpio_in_pin GPIO for input (default "18")
+ gpio_in_pin GPIO for input (default "18")
- gpio_in_pull Pull up/down/off on the input pin
- (default "down")
+ gpio_in_pull Pull up/down/off on the input pin
+ (default "down")
- sense Override the IR receive auto-detection logic:
- "0" = force active-high
- "1" = force active-low
- "-1" = use auto-detection
- (default "-1")
+ sense Override the IR receive auto-detection logic:
+ "0" = force active-high
+ "1" = force active-low
+ "-1" = use auto-detection
+ (default "-1")
- softcarrier Turn the software carrier "on" or "off"
- (default "on")
+ softcarrier Turn the software carrier "on" or "off"
+ (default "on")
- invert "on" = invert the output pin (default "off")
+ invert "on" = invert the output pin (default "off")
- debug "on" = enable additional debug messages
- (default "off")
+ debug "on" = enable additional debug messages
+ (default "off")
Name: mcp2515-can0
Info: Configures the MCP2515 CAN controller on spi0.0
Load: dtoverlay=mcp2515-can0,<param>=<val>
-Params: oscillator Clock frequency for the CAN controller (Hz)
+Params: oscillator Clock frequency for the CAN controller (Hz)
- spimaxfrequency Maximum SPI frequence (Hz)
+ spimaxfrequency Maximum SPI frequence (Hz)
- interrupt GPIO for interrupt signal
+ interrupt GPIO for interrupt signal
Name: mcp2515-can1
Info: Configures the MCP2515 CAN controller on spi0.1
Load: dtoverlay=mcp2515-can1,<param>=<val>
-Params: oscillator Clock frequency for the CAN controller (Hz)
+Params: oscillator Clock frequency for the CAN controller (Hz)
- spimaxfrequency Maximum SPI frequence (Hz)
+ spimaxfrequency Maximum SPI frequence (Hz)
- interrupt GPIO for interrupt signal
+ interrupt GPIO for interrupt signal
Name: mmc
Info: Selects the bcm2835-mmc SD/MMC driver, optionally with overclock
Load: dtoverlay=mmc,<param>=<val>
-Params: overclock_50 Clock (in MHz) to use when the MMC framework
- requests 50MHz
- force_pio Disable DMA support
+Params: overclock_50 Clock (in MHz) to use when the MMC framework
+ requests 50MHz
+ force_pio Disable DMA support
Name: mz61581
Info: MZ61581 display by Tontec
Load: dtoverlay=mz61581,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- txbuflen Transmit buffer length (default 32768)
+ txbuflen Transmit buffer length (default 32768)
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- xohms Touchpanel sensitivity (X-plate resistance)
+ xohms Touchpanel sensitivity (X-plate resistance)
[ The pcf2127-rtc overlay has been deleted. See i2c-rtc. ]
@@ -474,69 +474,69 @@ Params: speed Display
Name: piscreen
Info: PiScreen display by OzzMaker.com
Load: dtoverlay=piscreen,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- xohms Touchpanel sensitivity (X-plate resistance)
+ xohms Touchpanel sensitivity (X-plate resistance)
Name: piscreen2r
Info: PiScreen 2 with resistive TP display by OzzMaker.com
Load: dtoverlay=piscreen2r,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- xohms Touchpanel sensitivity (X-plate resistance)
+ xohms Touchpanel sensitivity (X-plate resistance)
Name: pitft28-capacitive
Info: Adafruit PiTFT 2.8" capacitive touch screen
Load: dtoverlay=pitft28-capacitive,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- touch-sizex Touchscreen size x (default 240)
+ touch-sizex Touchscreen size x (default 240)
- touch-sizey Touchscreen size y (default 320)
+ touch-sizey Touchscreen size y (default 320)
- touch-invx Touchscreen inverted x axis
+ touch-invx Touchscreen inverted x axis
- touch-invy Touchscreen inverted y axis
+ touch-invy Touchscreen inverted y axis
- touch-swapxy Touchscreen swapped x y axis
+ touch-swapxy Touchscreen swapped x y axis
Name: pitft28-resistive
Info: Adafruit PiTFT 2.8" resistive touch screen
Load: dtoverlay=pitft28-resistive,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
Name: pps-gpio
Info: Configures the pps-gpio (pulse-per-second time signal via GPIO).
Load: dtoverlay=pps-gpio,<param>=<val>
-Params: gpiopin Input GPIO (default "18")
+Params: gpiopin Input GPIO (default "18")
Name: pwm
@@ -553,9 +553,9 @@ Info: Configures a single PWM channel
4) Currently the clock must have been enabled and configured
by other means.
Load: dtoverlay=pwm,<param>=<val>
-Params: pin Output pin (default 18) - see table
- func Pin function (default 2 = Alt5) - see above
- clock PWM clock frequency (informational)
+Params: pin Output pin (default 18) - see table
+ func Pin function (default 2 = Alt5) - see above
+ clock PWM clock frequency (informational)
Name: pwm-2chan
@@ -572,11 +572,11 @@ Info: Configures both PWM channels
4) Currently the clock must have been enabled and configured
by other means.
Load: dtoverlay=pwm-2chan,<param>=<val>
-Params: pin Output pin (default 18) - see table
- pin2 Output pin for other channel (default 19)
- func Pin function (default 2 = Alt5) - see above
- func2 Function for pin2 (default 2 = Alt5)
- clock PWM clock frequency (informational)
+Params: pin Output pin (default 18) - see table
+ pin2 Output pin for other channel (default 19)
+ func Pin function (default 2 = Alt5) - see above
+ func2 Function for pin2 (default 2 = Alt5)
+ clock PWM clock frequency (informational)
Name: raspidac3
@@ -600,15 +600,15 @@ Params: <None>
Name: rpi-display
Info: RPi-Display - 2.8" Touch Display by Watterott
Load: dtoverlay=rpi-display,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- xohms Touchpanel sensitivity (X-plate resistance)
+ xohms Touchpanel sensitivity (X-plate resistance)
Name: rpi-ft5406
@@ -632,52 +632,52 @@ Params: <None>
Name: sdhost
Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock
Load: dtoverlay=sdhost,<param>=<val>
-Params: overclock_50 Clock (in MHz) to use when the MMC framework
- requests 50MHz
+Params: overclock_50 Clock (in MHz) to use when the MMC framework
+ requests 50MHz
- force_pio Disable DMA support (default off)
+ force_pio Disable DMA support (default off)
- pio_limit Number of blocks above which to use DMA
- (default 1)
+ pio_limit Number of blocks above which to use DMA
+ (default 1)
- debug Enable debug output (default off)
+ debug Enable debug output (default off)
Name: sdio
Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,
and enables SDIO via GPIOs 22-27.
Load: dtoverlay=sdio,<param>=<val>
-Params: overclock_50 SD Clock (in MHz) to use when the MMC framework
- requests 50MHz
+Params: overclock_50 SD Clock (in MHz) to use when the MMC framework
+ requests 50MHz
- sdio_overclock SDIO Clock (in MHz) to use when the MMC
- framework requests 50MHz
+ sdio_overclock SDIO Clock (in MHz) to use when the MMC
+ framework requests 50MHz
- force_pio Disable DMA support (default off)
+ force_pio Disable DMA support (default off)
- pio_limit Number of blocks above which to use DMA
- (default 1)
+ pio_limit Number of blocks above which to use DMA
+ (default 1)
- debug Enable debug output (default off)
+ debug Enable debug output (default off)
- poll_once Disable SDIO-device polling every second
- (default on: polling once at boot-time)
+ poll_once Disable SDIO-device polling every second
+ (default on: polling once at boot-time)
- bus_width Set the SDIO host bus width (default 4 bits)
+ bus_width Set the SDIO host bus width (default 4 bits)
Name: sdtweak
Info: Tunes the bcm2835-sdhost SD/MMC driver
Load: dtoverlay=sdtweak,<param>=<val>
-Params: overclock_50 Clock (in MHz) to use when the MMC framework
- requests 50MHz
+Params: overclock_50 Clock (in MHz) to use when the MMC framework
+ requests 50MHz
- force_pio Disable DMA support (default off)
+ force_pio Disable DMA support (default off)
- pio_limit Number of blocks above which to use DMA
- (default 1)
+ pio_limit Number of blocks above which to use DMA
+ (default 1)
- debug Enable debug output (default off)
+ debug Enable debug output (default off)
Name: smi
@@ -708,25 +708,25 @@ Name: tinylcd35
Info: 3.5" Color TFT Display by www.tinylcd.com
Options: Touch, RTC, keypad
Load: dtoverlay=tinylcd35,<param>=<val>
-Params: speed Display SPI bus speed
+Params: speed Display SPI bus speed
- rotate Display rotation {0,90,180,270}
+ rotate Display rotation {0,90,180,270}
- fps Delay between frame updates
+ fps Delay between frame updates
- debug Debug output level {0-7}
+ debug Debug output level {0-7}
- touch Enable touch panel
+ touch Enable touch panel
- touchgpio Touch controller IRQ GPIO
+ touchgpio Touch controller IRQ GPIO
- xohms Touchpanel: Resistance of X-plate in ohms
+ xohms Touchpanel: Resistance of X-plate in ohms
- rtc-pcf PCF8563 Real Time Clock
+ rtc-pcf PCF8563 Real Time Clock
- rtc-ds DS1307 Real Time Clock
+ rtc-ds DS1307 Real Time Clock
- keypad Enable keypad
+ keypad Enable keypad
Examples:
Display with touchpanel, PCF8563 RTC and keypad:
@@ -738,9 +738,9 @@ Params: speed Display
Name: uart1
Info: Enable uart1 in place of uart0
Load: dtoverlay=uart1,<param>=<val>
-Params: txd1_pin GPIO pin for TXD1 (14, 32 or 40 - default 14)
+Params: txd1_pin GPIO pin for TXD1 (14, 32 or 40 - default 14)
- rxd1_pin GPIO pin for RXD1 (15, 33 or 41 - default 15)
+ rxd1_pin GPIO pin for RXD1 (15, 33 or 41 - default 15)
Name: vc4-kms-v3d
@@ -763,22 +763,22 @@ Name: w1-gpio
Info: Configures the w1-gpio Onewire interface module.
Use this overlay if you *don't* need a GPIO to drive an external pullup.
Load: dtoverlay=w1-gpio,<param>=<val>
-Params: gpiopin GPIO for I/O (default "4")
+Params: gpiopin GPIO for I/O (default "4")
- pullup Non-zero, "on", or "y" to enable the parasitic
- power (2-wire, power-on-data) feature
+ pullup Non-zero, "on", or "y" to enable the parasitic
+ power (2-wire, power-on-data) feature
Name: w1-gpio-pullup
Info: Configures the w1-gpio Onewire interface module.
Use this overlay if you *do* need a GPIO to drive an external pullup.
Load: dtoverlay=w1-gpio-pullup,<param>=<val>
-Params: gpiopin GPIO for I/O (default "4")
+Params: gpiopin GPIO for I/O (default "4")
- pullup Non-zero, "on", or "y" to enable the parasitic
- power (2-wire, power-on-data) feature
+ pullup Non-zero, "on", or "y" to enable the parasitic
+ power (2-wire, power-on-data) feature
- extpullup GPIO for external pullup (default "5")
+ extpullup GPIO for external pullup (default "5")
Troubleshooting
|
