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
|
From 5f9fcc99c517a517e8d74ce001fc5bc2648f0e59 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Thu, 30 Apr 2020 19:41:10 +0200
Subject: [PATCH] overlays: gpio-shutdown: Add information for
Raspberry Pi 1 Model B rev 1
Raspberry Pi 1 Model B rev 1 uses GPIO1 for power-up instead of GPIO3.
---
arch/arm/boot/dts/overlays/README | 10 ++++++++--
arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts | 6 ++++--
2 files changed, 12 insertions(+), 4 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -883,9 +883,14 @@ Info: Initiates a shutdown when GPIO p
can be powered up again by driving GPIO3 low. The default
configuration uses GPIO3 with a pullup, so if you connect a
button between GPIO3 and GND (pin 5 and 6 on the 40-pin header),
- you get a shutdown and power-up button.
+ you get a shutdown and power-up button. Please note that
+ Raspberry Pi 1 Model B rev 1 uses GPIO1 instead of GPIO3.
Load: dtoverlay=gpio-shutdown,<param>=<val>
Params: gpio_pin GPIO pin to trigger on (default 3)
+ For Raspberry Pi 1 Model B rev 1 set this
+ explicitly to value 1, e.g.:
+
+ dtoverlay=gpio-shutdown,gpio_pin=1
active_low When this is 1 (active low), a falling
edge generates a key down event and a
@@ -897,7 +902,8 @@ Params: gpio_pin GPIO pin
Default is "up".
Note that the default pin (GPIO3) has an
- external pullup.
+ external pullup. Same applies for GPIO1
+ on Raspberry Pi 1 Model B rev 1.
debounce Specify the debounce interval in milliseconds
(default 100)
--- a/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
+++ b/arch/arm/boot/dts/overlays/gpio-shutdown-overlay.dts
@@ -4,7 +4,9 @@
// This overlay sets up an input device that generates KEY_POWER events
// when a given GPIO pin changes. It defaults to using GPIO3, which can
-// also be used to wake up (start) the Rpi again after shutdown. Since
+// also be used to wake up (start) the Rpi again after shutdown.
+// Raspberry Pi 1 Model B rev 1 can be wake up only by GPIO1 pin, so for
+// these boards change default GPIO pin to 1 via gpio_pin parameter. Since
// wakeup is active-low, this defaults to active-low with a pullup
// enabled, but all of this can be changed using overlay parameters (but
// note that GPIO3 has an external pullup on at least some boards).
@@ -71,7 +73,7 @@
// Allow changing the internal pullup/down state. 0 = none, 1 = pulldown, 2 = pullup
// Note that GPIO3 and GPIO2 are the I2c pins and have an external pullup (at least
- // on some boards).
+ // on some boards). Same applies for GPIO1 on Raspberry Pi 1 Model B rev 1.
gpio_pull = <&pin_state>,"brcm,pull:0";
// Allow setting the active_low flag. 0 = active high, 1 = active low
|
