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pwm: imx1: Implement .apply callback

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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.

As a side effect this improves the behaviour for big duty cycles where
max * duty_ns overflowed before.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2021-11-18 11:46:44 +01:00 committed by Thierry Reding
parent 9136a39e6c
commit b23fd25ec8
1 changed files with 28 additions and 5 deletions
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33
drivers/pwm/pwm-imx1.c
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@ -61,7 +61,7 @@ static void pwm_imx1_clk_disable_unprepare(struct pwm_chip *chip)
} }
static int pwm_imx1_config(struct pwm_chip *chip, static int pwm_imx1_config(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns) struct pwm_device *pwm, u64 duty_ns, u64 period_ns)
{ {
struct pwm_imx1_chip *imx = to_pwm_imx1_chip(chip); struct pwm_imx1_chip *imx = to_pwm_imx1_chip(chip);
u32 max, p; u32 max, p;
@ -84,7 +84,7 @@ static int pwm_imx1_config(struct pwm_chip *chip,
* (/2 .. /16). * (/2 .. /16).
*/ */
max = readl(imx->mmio_base + MX1_PWMP); max = readl(imx->mmio_base + MX1_PWMP);
p = max * duty_ns / period_ns; p = mul_u64_u64_div_u64(max, duty_ns, period_ns);
writel(max - p, imx->mmio_base + MX1_PWMS); writel(max - p, imx->mmio_base + MX1_PWMS);
@ -120,10 +120,33 @@ static void pwm_imx1_disable(struct pwm_chip *chip, struct pwm_device *pwm)
pwm_imx1_clk_disable_unprepare(chip); pwm_imx1_clk_disable_unprepare(chip);
} }
static int pwm_imx1_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)
pwm_imx1_disable(chip, pwm);
return 0;
}
err = pwm_imx1_config(chip, pwm, state->duty_cycle, state->period);
if (err)
return err;
if (!pwm->state.enabled)
return pwm_imx1_enable(chip, pwm);
return 0;
}
static const struct pwm_ops pwm_imx1_ops = { static const struct pwm_ops pwm_imx1_ops = {
.enable = pwm_imx1_enable, .apply = pwm_imx1_apply,
.disable = pwm_imx1_disable,
.config = pwm_imx1_config,
.owner = THIS_MODULE, .owner = THIS_MODULE,
}; };