diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2021-11-29 22:28:05 +0100 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2022-02-02 18:03:05 +0100 |
| commit | 657e54e54ba5b3859848e0ea78d6384ebb7479d6 (patch) | |
| tree | dd82f24e5506b22f8bf0f5e6383dbc408904101c | |
| parent | 431c322298de001914ffe64b8792401c26bfb332 (diff) | |
| download | linux-657e54e54ba5b3859848e0ea78d6384ebb7479d6.tar.bz2 | |
pwm: pxa: Implement .apply() callback
To eventually get rid of all legacy drivers convert this driver to the
modern world implementing .apply(). This just pushes down a slightly
optimized variant of how legacy drivers are handled in the core.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
| -rw-r--r-- | drivers/pwm/pwm-pxa.c | 33 |
1 files changed, 28 insertions, 5 deletions
diff --git a/drivers/pwm/pwm-pxa.c b/drivers/pwm/pwm-pxa.c index 238ec88c130b..0bcaa58c6a91 100644 --- a/drivers/pwm/pwm-pxa.c +++ b/drivers/pwm/pwm-pxa.c @@ -58,7 +58,7 @@ static inline struct pxa_pwm_chip *to_pxa_pwm_chip(struct pwm_chip *chip) * duty_ns = 10^9 * (PRESCALE + 1) * DC / PWM_CLK_RATE */ static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, - int duty_ns, int period_ns) + u64 duty_ns, u64 period_ns) { struct pxa_pwm_chip *pc = to_pxa_pwm_chip(chip); unsigned long long c; @@ -84,7 +84,7 @@ static int pxa_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, if (duty_ns == period_ns) dc = PWMDCR_FD; else - dc = (pv + 1) * duty_ns / period_ns; + dc = mul_u64_u64_div_u64(pv + 1, duty_ns, period_ns); /* NOTE: the clock to PWM has to be enabled first * before writing to the registers @@ -115,10 +115,33 @@ static void pxa_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) clk_disable_unprepare(pc->clk); } +static int pxa_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + int err; + + if (state->polarity != PWM_POLARITY_NORMAL) + return -EINVAL; + + if (!state->enabled) { + if (pwm->state.enabled) + pxa_pwm_disable(chip, pwm); + + return 0; + } + + err = pxa_pwm_config(chip, pwm, state->duty_cycle, state->period); + if (err) + return err; + + if (!pwm->state.enabled) + return pxa_pwm_enable(chip, pwm); + + return 0; +} + static const struct pwm_ops pxa_pwm_ops = { - .config = pxa_pwm_config, - .enable = pxa_pwm_enable, - .disable = pxa_pwm_disable, + .apply = pxa_pwm_apply, .owner = THIS_MODULE, }; |