diff options
| author | Tommaso Merciai <tommaso.merciai@amarulasolutions.com> | 2022-03-26 14:19:07 +0300 |
|---|---|---|
| committer | Stefano Babic <sbabic@denx.de> | 2022-04-12 18:33:55 +0300 |
| commit | 6828b3ecea2ce91eaa9b7636ef50f0439d15464f (patch) | |
| tree | d2b031810c2c03c69448d3e6297940182132e604 /drivers/pwm | |
| parent | bfc778cb93a33233fa44006ea283b5aa36ad387d (diff) | |
| download | u-boot-6828b3ecea2ce91eaa9b7636ef50f0439d15464f.tar.xz | |
driver: pwm: pwm-imx: introduce pwm_dm_imx_get_parms
Introduce pwm_dm_imx_get_parms, dm version of pwm_imx_get_parms.
This function get clock rate using clk dm api
Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/pwm-imx.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index becd902cc2..ce1290aa7d 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -88,6 +88,36 @@ struct imx_pwm_priv { struct clk ipg_clk; }; +int pwm_dm_imx_get_parms(struct imx_pwm_priv *priv, int period_ns, + int duty_ns, unsigned long *period_c, unsigned long *duty_c, + unsigned long *prescale) +{ + unsigned long long c; + + c = clk_get_rate(&priv->per_clk); + c = c * period_ns; + do_div(c, 1000000000); + *period_c = c; + + *prescale = *period_c / 0x10000 + 1; + + *period_c /= *prescale; + c = *period_c * (unsigned long long)duty_ns; + do_div(c, period_ns); + *duty_c = c; + + /* + * according to imx pwm RM, the real period value should be + * PERIOD value in PWMPR plus 2. + */ + if (*period_c > 2) + *period_c -= 2; + else + *period_c = 0; + + return 0; +} + static int imx_pwm_set_invert(struct udevice *dev, uint channel, bool polarity) { @@ -108,7 +138,7 @@ static int imx_pwm_set_config(struct udevice *dev, uint channel, debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel); - pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles, + pwm_dm_imx_get_parms(priv, period_ns, duty_ns, &period_cycles, &duty_cycles, &prescale); return pwm_config_internal(regs, period_cycles, duty_cycles, prescale); |