mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

pwm: brcmstb: Implement .apply() callback 

To eventually get rid of all legacy drivers convert this driver to the
modern world implementing .apply().

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2022-02-14 09:23:53 +01:00 committed by Thierry Reding
parent 5a4715208c
commit 0dcfafe7d4
1 changed files with 25 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
drivers/pwm/pwm-brcmstb.c
View File

@ -95,7 +95,7 @@ static inline struct brcmstb_pwm *to_brcmstb_pwm(struct pwm_chip *chip)
* "on" time, so this translates directly into our HW programming here.
*/
static int brcmstb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
u64 duty_ns, u64 period_ns)
{
struct brcmstb_pwm *p = to_brcmstb_pwm(chip);
unsigned long pc, dc, cword = CONST_VAR_F_MAX;
@ -114,22 +114,17 @@ static int brcmstb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
}
while (1) {
u64 rate, tmp;
u64 rate;
/*
* Calculate the base rate from base frequency and current
* cword
*/
rate = (u64)clk_get_rate(p->clk) * (u64)cword;
do_div(rate, 1 << CWORD_BIT_SIZE);
rate >>= CWORD_BIT_SIZE;
tmp = period_ns * rate;
do_div(tmp, NSEC_PER_SEC);
pc = tmp;
tmp = (duty_ns + 1) * rate;
do_div(tmp, NSEC_PER_SEC);
dc = tmp;
pc = mul_u64_u64_div_u64(period_ns, rate, NSEC_PER_SEC);
dc = mul_u64_u64_div_u64(duty_ns + 1, rate, NSEC_PER_SEC);
/*
* We can be called with separate duty and period updates,
@ -202,26 +197,34 @@ static inline void brcmstb_pwm_enable_set(struct brcmstb_pwm *p,
spin_unlock(&p->lock);
}
static int brcmstb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
static int brcmstb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
struct brcmstb_pwm *p = to_brcmstb_pwm(chip);
int err;
brcmstb_pwm_enable_set(p, pwm->hwpwm, true);
if (state->polarity != PWM_POLARITY_NORMAL)
return -EINVAL;
if (!state->enabled) {
if (pwm->state.enabled)
brcmstb_pwm_enable_set(p, pwm->hwpwm, false);
return 0;
}
err = brcmstb_pwm_config(chip, pwm, state->duty_cycle, state->period);
if (err)
return err;
if (!pwm->state.enabled)
brcmstb_pwm_enable_set(p, pwm->hwpwm, true);
return 0;
}
static void brcmstb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct brcmstb_pwm *p = to_brcmstb_pwm(chip);
brcmstb_pwm_enable_set(p, pwm->hwpwm, false);
}
static const struct pwm_ops brcmstb_pwm_ops = {
.config = brcmstb_pwm_config,
.enable = brcmstb_pwm_enable,
.disable = brcmstb_pwm_disable,
.apply = brcmstb_pwm_apply,
.owner = THIS_MODULE,
};