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driver: pwm: pwm-imx: introduce pwm_dm_imx_get_parms

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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>
This commit is contained in:
Tommaso Merciai 2022-03-26 12:19:07 +01:00 committed by Stefano Babic
parent bfc778cb93
commit 6828b3ecea
1 changed files with 31 additions and 1 deletions
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32
drivers/pwm/pwm-imx.c
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@ -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);