diff options
| -rw-r--r-- | drivers/pwm/core.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index ccd54c089bab8..bc05818fa3703 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -1000,11 +1000,27 @@ of_pwm_xlate_with_flags(struct pwm_chip *chip, const struct of_phandle_args *arg } EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags); +/* + * This callback is used for PXA PWM chips that only have a single PWM line. + * For such chips you could argue that passing the line number (i.e. the first + * parameter in the common case) is useless as it's always zero. So compared to + * the default xlate function of_pwm_xlate_with_flags() the first parameter is + * the default period and the second are flags. + * + * Note that if #pwm-cells = <3>, the semantic is the same as for + * of_pwm_xlate_with_flags() to allow converting the affected driver to + * #pwm-cells = <3> without breaking the legacy binding. + * + * Don't use for new drivers. + */ struct pwm_device * of_pwm_single_xlate(struct pwm_chip *chip, const struct of_phandle_args *args) { struct pwm_device *pwm; + if (args->args_count >= 3) + return of_pwm_xlate_with_flags(chip, args); + pwm = pwm_request_from_chip(chip, 0, NULL); if (IS_ERR(pwm)) return pwm; |