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>
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index becd902..ce1290a 100644
--- a/drivers/pwm/pwm-imx.c
+++ b/drivers/pwm/pwm-imx.c
@@ -88,6 +88,36 @@
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 @@
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);