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PWM: Allow multiple PWMs per device node 

Matching a device node is enough since a device node may have
multiple PWMs. Check for a id aswell.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2015-06-12 11:48:17 +02:00
parent cd616c4642
commit 605621a3c8
2 changed files with 6 additions and 3 deletions
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7
drivers/pwm/core.c
View File

@ -181,12 +181,13 @@ struct pwm_device *pwm_request(const char *devname)
}
EXPORT_SYMBOL_GPL(pwm_request);
static struct pwm_device *of_node_to_pwm_device(struct device_node *np)
static struct pwm_device *of_node_to_pwm_device(struct device_node *np, int id)
{
struct pwm_device *pwm;
list_for_each_entry(pwm, &pwm_list, node) {
if (pwm->hwdev && pwm->hwdev->device_node == np)
if (pwm->hwdev && pwm->hwdev->device_node == np &&
pwm->chip->id == id)
return pwm;
}
@ -210,7 +211,7 @@ struct pwm_device *of_pwm_request(struct device_node *np, const char *con_id)
return ERR_PTR(ret);
}
pwm = of_node_to_pwm_device(args.np);
pwm = of_node_to_pwm_device(args.np, args.args[0]);
if (IS_ERR(pwm)) {
pr_debug("%s(): PWM chip not found\n", __func__);
return pwm;

2
include/pwm.h
View File

@ -57,12 +57,14 @@ struct pwm_ops {
/**
* struct pwm_chip - abstract a PWM
* @id: The id of this pwm
* @devname: unique identifier for this pwm
* @ops: The callbacks for this PWM
* @duty_ns: The duty cycle of the PWM, in nano-seconds
* @period_ns: The period of the PWM, in nano-seconds
*/
struct pwm_chip {
int id;
const char *devname;
struct pwm_ops *ops;
int duty_ns;