[RFC v2 11/11] ARM: dts: stm32: add dfsdm iio support on stm32mp157c-ev

[Olivier Moysan <olivier.moysan@xxxxxxxxxxx>]

This DT is an example of backend iio device used for STM32 DFSDM.
DFSDM filter1 has a single input channel, while filter0 is configured
to support scan mode with two input channels.

Signed-off-by: Olivier Moysan <olivier.moysan@xxxxxxxxxxx>
---
 arch/arm/boot/dts/st/stm32mp157c-ev1.dts | 68 ++++++++++++++++++++++++
 1 file changed, 68 insertions(+)

diff --git a/arch/arm/boot/dts/st/stm32mp157c-ev1.dts b/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
index af3800501875..edeac26f39a4 100644
--- a/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
+++ b/arch/arm/boot/dts/st/stm32mp157c-ev1.dts
@@ -73,6 +73,27 @@ panel_backlight: panel-backlight {
 		default-on;
 		status = "okay";
 	};
+
+	sd_adc0: sd-adc0 {
+		compatible = "sd-modulator";
+		#io-backend-cells = <0>;
+		vref-supply = <&v3v3>;
+		status = "okay";
+	};
+
+	sd_adc1: sd-adc1 {
+		compatible = "sd-modulator";
+		#io-backend-cells = <0>;
+		vref-supply = <&v3v3>;
+		status = "okay";
+	};
+
+	sd_adc2: sd-adc2 {
+		compatible = "sd-modulator";
+		#io-backend-cells = <0>;
+		vref-supply = <&v3v3>;
+		status = "okay";
+	};
 };
 
 &cec {
@@ -99,6 +120,53 @@ dcmi_0: endpoint {
 	};
 };
 
+&dfsdm {
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&dfsdm_clkout_pins_a
+		     &dfsdm_data1_pins_a &dfsdm_data3_pins_a>;
+	pinctrl-1 = <&dfsdm_clkout_sleep_pins_a
+		     &dfsdm_data1_sleep_pins_a &dfsdm_data3_sleep_pins_a>;
+	spi-max-frequency = <2048000>;
+	status = "okay";
+
+	dfsdm0: filter@0 {
+		compatible = "st,stm32-dfsdm-adc";
+		st,filter-order = <3>;
+		status = "okay";
+
+		channel@0 {
+			reg = <0>;
+			label = "in0";
+			st,adc-channel-types = "SPI_F";
+			st,adc-channel-clk-src = "CLKOUT";
+			st,adc-alt-channel;
+			io-backends = <&sd_adc0>;
+		};
+
+		channel@1 {
+			reg = <1>;
+			label = "in1";
+			st,adc-channel-types = "SPI_R";
+			st,adc-channel-clk-src = "CLKOUT";
+			io-backends = <&sd_adc1>;
+		};
+	};
+
+	dfsdm1: filter@1 {
+		compatible = "st,stm32-dfsdm-adc";
+		st,filter-order = <3>;
+		status = "okay";
+
+		channel@3 {
+			reg = <3>;
+			label = "in3";
+			st,adc-channel-types = "SPI_R";
+			st,adc-channel-clk-src = "CLKOUT";
+			io-backends = <&sd_adc2>;
+		};
+	};
+};
+
 &dsi {
 	phy-dsi-supply = <&reg18>;
 	#address-cells = <1>;
-- 
2.25.1