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pwm: Device tree support for PWM polarity

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Add support for encoding PWM properties in bit encoded form with
of_pwm_xlate_with_flags() function support. Platforms require platform
specific PWM properties has to populate in 3rd cell of the pwm-specifier
and PWM driver should also set .of_xlate support with this function.
Currently PWM property polarity encoded in bit position 0 of the third
cell in pwm-specifier.

Signed-off-by: Philip, Avinash <[email protected]>
Acked-by: Grant Likely <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
This commit is contained in:
Philip, Avinash 2012-11-21 13:10:44 +05:30 • committed by Thierry Reding
commit 83af24027b
3 changed files with 45 additions and 3 deletions
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28
drivers/pwm/core.c
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@ -32,6 +32,9 @@
#define MAX_PWMS 1024
/* flags in the third cell of the DT PWM specifier */
#define PWM_SPEC_POLARITY (1 << 0)
static DEFINE_MUTEX(pwm_lookup_lock);
static LIST_HEAD(pwm_lookup_list);
static DEFINE_MUTEX(pwm_lock);
@ -129,6 +132,31 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label)
return 0;
}
struct pwm_device *
of_pwm_xlate_with_flags(struct pwm_chip *pc, const struct of_phandle_args *args)
{
struct pwm_device *pwm;
if (pc->of_pwm_n_cells < 3)
return ERR_PTR(-EINVAL);
if (args->args[0] >= pc->npwm)
return ERR_PTR(-EINVAL);
pwm = pwm_request_from_chip(pc, args->args[0], NULL);
if (IS_ERR(pwm))
return pwm;
pwm_set_period(pwm, args->args[1]);
if (args->args[2] & PWM_SPEC_POLARITY)
pwm_set_polarity(pwm, PWM_POLARITY_INVERSED);
else
pwm_set_polarity(pwm, PWM_POLARITY_NORMAL);
return pwm;
}
static struct pwm_device *
of_pwm_simple_xlate(struct pwm_chip *pc, const struct of_phandle_args *args)
{