[PATCH 8/8] ARM: dts: stm32: add adc support on stm32mp135f-dk

Olivier Moysan
2022-09-28T16:46:47Z

Configure ADC support on stm32mp135f-dk. ADC can be used for
USB Type-C CC1 & CC2 pins wired to in6 & in12.

Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
---
arch/arm/boot/dts/stm32mp135f-dk.dts | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)

diff --git a/arch/arm/boot/dts/stm32mp135f-dk.dts b/arch/arm/boot/dts/stm32mp135f-dk.dts
index 95068231ed57..5b7630a2452e 100644
--- a/arch/arm/boot/dts/stm32mp135f-dk.dts
+++ b/arch/arm/boot/dts/stm32mp135f-dk.dts
@@ -76,6 +76,32 @@ vdd_adc: vdd-adc {
};
};

+&adc_1 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&adc1_usb_cc_pins_a>;
+ vdda-supply = <&vdd_adc>;
+ vref-supply = <&vdd_adc>;
+ status = "okay";
+
+ adc1: adc@0 {
+ status = "okay";
+ /*
+ * Type-C USB_PWR_CC1 & USB_PWR_CC2 on in6 & in12.
+ * Use at least 5 * RC time, e.g. 5 * (Rp + Rd) * C:
+ * 5 * (5.1 + 47kOhms) * 5pF => 1.3us.
+ * Use arbitrary margin here (e.g. 5us).
+ */
+ channel@6 {
+ reg = <6>;
+ st,min-sample-time-ns = <5000>;
+ };
+ channel@12 {
+ reg = <12>;
+ st,min-sample-time-ns = <5000>;
+ };
+ };
+};
+
&iwdg2 {
timeout-sec = <32>;
status = "okay";