Add node to test MAX11100 ADC with LED28 connected to the chip input
line.
The ADC sits on a gpio-spi master.
Signed-off-by: Jacopo Mondi <jacopo@xxxxxxxxxx>
---
Sending as RFC only, not for inclusion.
Used to test MAX11100 ADC driver currently connected to Koelsch GPIO
expander.
v1 -> v2:
- add fixed regulator to supply vref to max11100 ADC
---
arch/arm/boot/dts/r8a7791-koelsch.dts | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/arch/arm/boot/dts/r8a7791-koelsch.dts b/arch/arm/boot/dts/r8a7791-koelsch.dts
index 5405d33..1756b86 100644
--- a/arch/arm/boot/dts/r8a7791-koelsch.dts
+++ b/arch/arm/boot/dts/r8a7791-koelsch.dts
@@ -170,6 +170,38 @@
gpios = <&gpio2 21 GPIO_ACTIVE_HIGH>;
label = "LED8";
};
+ led28 {
+ gpios = <&gpio5 28 GPIO_ACTIVE_HIGH>;
+ label = "LED28";
+ };
+ };
+
+ vref_adc0: regulator-vref-adc0 {
+ compatible = "regulator-fixed";
+
+ regulator-name = "ADC0 Vref";
+ regulator-min-microvolt = <4096000>;
+ regulator-max-microvolt = <4096000>;
+
+ regulator-always-on;
+ };
+
+ spi_gpio: spi-gpio@0 {
+ compatible = "spi-gpio";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ gpio-sck = <&gpio5 27 GPIO_ACTIVE_HIGH>;
+ gpio-miso = <&gpio5 25 GPIO_ACTIVE_HIGH>;
+ num-chipselects = <1>;
+ cs-gpios = <&gpio5 26 GPIO_ACTIVE_LOW>;
+ status = "okay";
+
+ adc0: max11100@0 {
+ compatible = "maxim,max11100";
+ reg = <0>;
+ spi-max-frequency = <2500000>;
+ vref-supply = <&vref_adc0>;
+ };
};
vcc_sdhi0: regulator-vcc-sdhi0 {
--
2.7.4
