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
|
#include <common.h>
#include <errno.h>
#include <of.h>
#include <of_gpio.h>
#include <gpio.h>
/**
* of_get_named_gpio_flags() - Get a GPIO number and flags to use with GPIO API
* @np: device node to get GPIO from
* @propname: property name containing gpio specifier(s)
* @index: index of the GPIO
* @flags: a flags pointer to fill in
*
* Returns GPIO number to use with GPIO API, or one of the errno value on the
* error condition. If @flags is not NULL the function also fills in flags for
* the GPIO.
*/
int of_get_named_gpio_flags(struct device_node *np, const char *propname,
int index, enum of_gpio_flags *flags)
{
struct of_phandle_args out_args;
struct device_d *dev;
int ret;
ret = of_parse_phandle_with_args(np, propname, "#gpio-cells",
index, &out_args);
if (ret) {
pr_debug("%s: cannot parse %s property: %d\n",
__func__, propname, ret);
return ret;
}
dev = of_find_device_by_node(out_args.np);
if (!dev) {
pr_debug("%s: unable to find device of node %s\n",
__func__, out_args.np->full_name);
return -EPROBE_DEFER;
}
ret = gpio_get_num(dev, out_args.args[0]);
if (ret == -EPROBE_DEFER)
return ret;
if (ret < 0) {
pr_err("%s: unable to get gpio num of device %s: %d\n",
__func__, dev_name(dev), ret);
return ret;
}
if (flags)
*flags = out_args.args[1];
return ret;
}
EXPORT_SYMBOL(of_get_named_gpio_flags);
|
