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 --- Changes since v3: - Fix clk_get_rate call
drivers/pwm/pwm-imx.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-)
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index 74b0817a05..1d656e726f 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -153,6 +153,36 @@ 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) { @@ -173,7 +203,7 @@ 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);