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
|
From 3e060982d93902bcca8503df4e33d6cd1e41e21b Mon Sep 17 00:00:00 2001
From: Nick Bulleid <nedbulleid@fastmail.com>
Date: Thu, 10 May 2018 21:57:02 +0100
Subject: [PATCH] Add ability to export gpio used by gpio-poweroff
Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>
Added export feature to gpio-poweroff documentation
Signed-off-by: Nick Bulleid <nedbulleid@fastmail.com>
---
.../devicetree/bindings/power/reset/gpio-poweroff.txt | 1 +
drivers/power/reset/gpio-poweroff.c | 9 +++++++++
2 files changed, 10 insertions(+)
--- a/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
+++ b/Documentation/devicetree/bindings/power/reset/gpio-poweroff.txt
@@ -29,6 +29,7 @@ Optional properties:
inactive state.
- timeout-ms: Time to wait before asserting a WARN_ON(1). If nothing is
specified, 3000 ms is used.
+- export : Export the GPIO line to the sysfs system
Examples:
--- a/drivers/power/reset/gpio-poweroff.c
+++ b/drivers/power/reset/gpio-poweroff.c
@@ -52,6 +52,7 @@ static int gpio_poweroff_probe(struct pl
bool input = false;
enum gpiod_flags flags;
bool force = false;
+ bool export = false;
/* If a pm_power_off function has already been added, leave it alone */
force = of_property_read_bool(pdev->dev.of_node, "force");
@@ -74,6 +75,12 @@ static int gpio_poweroff_probe(struct pl
if (IS_ERR(reset_gpio))
return PTR_ERR(reset_gpio);
+ export = of_property_read_bool(pdev->dev.of_node, "export");
+ if (export) {
+ gpiod_export(reset_gpio, false);
+ gpiod_export_link(&pdev->dev, "poweroff-gpio", reset_gpio);
+ }
+
pm_power_off = &gpio_poweroff_do_poweroff;
return 0;
}
@@ -83,6 +90,8 @@ static int gpio_poweroff_remove(struct p
if (pm_power_off == &gpio_poweroff_do_poweroff)
pm_power_off = NULL;
+ gpiod_unexport(reset_gpio);
+
return 0;
}
|
