soc: mcxc: Enable bandgap buffer for on die temperature measurement

michal-smola · carlescufi · commit da6310c96ce4 · 2024-10-24T14:05:00.000+02:00
Bandgap voltage is used for on die temperature measurement. Bandgap
buffer has to be enabled explicitly to get correct tempearature.
Enable the buffer if TEMP_KINETIS is selected.

Signed-off-by: Michal Smola &lt;michal.smola@nxp.com&gt;
diff --git a/soc/nxp/mcx/mcxc/soc.c b/soc/nxp/mcx/mcxc/soc.c
@@ -109,6 +109,11 @@ static void clock_init(void)
 
 void soc_early_init_hook(void)
 {
+#ifdef CONFIG_TEMP_KINETIS
+	/* enable bandgap buffer */
+	PMC->REGSC |= PMC_REGSC_BGBE_MASK;
+#endif /* CONFIG_TEMP_KINETIS */
+
 	clock_init();
 }
 

Original file line number	Diff line number	Diff line change
`@@ -109,6 +109,11 @@ static void clock_init(void)`
`109`	`109`
`110`	`110`	`void soc_early_init_hook(void)`
`111`	`111`	`{`
	`112`	`+#ifdef CONFIG_TEMP_KINETIS`
	`113`	`+ /* enable bandgap buffer */`
	`114`	`+ PMC->REGSC \|= PMC_REGSC_BGBE_MASK;`
	`115`	`+#endif /* CONFIG_TEMP_KINETIS */`
	`116`	`+`
`112`	`117`	`clock_init();`
`113`	`118`	`}`
`114`	`119`