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