linux-kernel - [PATCH 10/15] ARM: dts: microchip: sama7d65: add node for the ADC

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Message-ID: <20250804100219.63325-11-varshini.rajendran@microchip.com>
Date: Mon, 4 Aug 2025 15:32:14 +0530
From: Varshini Rajendran <varshini.rajendran@...rochip.com>
To: <eugen.hristev@...aro.org>, <jic23@...nel.org>, <dlechner@...libre.com>,
	<nuno.sa@...log.com>, <andy@...nel.org>, <robh@...nel.org>,
	<krzk+dt@...nel.org>, <conor+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
	<alexandre.belloni@...tlin.com>, <claudiu.beznea@...on.dev>,
	<srini@...nel.org>, <linux-iio@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: <varshini.rajendran@...rochip.com>, Romain Sioen
	<romain.sioen@...rochip.com>
Subject: [PATCH 10/15] ARM: dts: microchip: sama7d65: add node for the ADC

Add node for the ADC controller in sama7d65 SoC. Also add corresponding
regulator and pinmux for the ADC.

Signed-off-by: Romain Sioen <romain.sioen@...rochip.com>
Signed-off-by: Varshini Rajendran <varshini.rajendran@...rochip.com>
---
 .../dts/microchip/at91-sama7d65_curiosity.dts | 23 +++++++++++++++
 arch/arm/boot/dts/microchip/sama7d65.dtsi     | 29 +++++++++++++++++++
 2 files changed, 52 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts
index 7250823a6f59..7ecc748456ba 100644
--- a/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts
+++ b/arch/arm/boot/dts/microchip/at91-sama7d65_curiosity.dts
@@ -41,6 +41,14 @@ reg_5v: regulator-5v {
 
 };
 
+&adc {
+	vddana-supply = <&vddout25>;
+	vref-supply = <&vddout25>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_adc_default &pinctrl_adtrg_default>;
+	status = "okay";
+};
+
 &dma0 {
 	status = "okay";
 };
@@ -278,6 +286,16 @@ &main_xtal {
 };
 
 &pioa {
+	pinctrl_adc_default: adc_default {
+		pinmux = <PIN_PC5__GPIO>;
+		bias-disable;
+	};
+
+	pinctrl_adtrg_default: adtrg-default {
+		pinmux = <PIN_PB7__ADTRG>;
+		bias-pull-up;
+	};
+
 	pinctrl_gmac0_default: gmac0-default {
 		pinmux = <PIN_PA26__G0_TX0>,
 			 <PIN_PA27__G0_TX1>,
@@ -373,3 +391,8 @@ input@0 {
 &slow_xtal {
 	clock-frequency = <32768>;
 };
+
+&vddout25 {
+	vin-supply = <&vdd_3v3>;
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/microchip/sama7d65.dtsi b/arch/arm/boot/dts/microchip/sama7d65.dtsi
index 2e20a7532c03..1f249323d08a 100644
--- a/arch/arm/boot/dts/microchip/sama7d65.dtsi
+++ b/arch/arm/boot/dts/microchip/sama7d65.dtsi
@@ -11,6 +11,7 @@
 #include <dt-bindings/clock/at91.h>
 #include <dt-bindings/dma/at91.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/iio/adc/at91-sama5d2_adc.h>
 #include <dt-bindings/interrupt-controller/arm-gic.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 #include <dt-bindings/mfd/at91-usart.h>
@@ -83,6 +84,16 @@ slow_xtal: clock-slowxtal {
 		};
 	};
 
+	vddout25: fixed-regulator-vddout25 {
+		compatible = "regulator-fixed";
+
+		regulator-name = "VDDOUT25";
+		regulator-min-microvolt = <2500000>;
+		regulator-max-microvolt = <2500000>;
+		regulator-boot-on;
+		status = "disabled";
+	};
+
 	ns_sram: sram@...000 {
 		compatible = "mmio-sram";
 		reg = <0x100000 0x20000>;
@@ -199,6 +210,24 @@ chipid@...20000 {
 			reg = <0xe0020000 0x8>;
 		};
 
+		adc: adc@...00000 {
+			compatible = "microchip,sama7d65-adc";
+			reg = <0xe1000000 0x200>;
+			interrupts = <GIC_SPI 25 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&pmc PMC_TYPE_GCK 25>;
+			assigned-clocks = <&pmc PMC_TYPE_GCK 25>;
+			assigned-clock-rates = <100000000>;
+			clock-names = "adc_clk";
+			dmas = <&dma0 AT91_XDMAC_DT_PERID(0)>;
+			dma-names = "rx";
+			atmel,min-sample-rate-hz = <200000>;
+			atmel,max-sample-rate-hz = <20000000>;
+			atmel,trigger-edge-type = <IRQ_TYPE_EDGE_RISING>;
+			atmel,startup-time-ms = <4>;
+			#io-channel-cells = <1>;
+			status = "disabled";
+		};
+
 		dma2: dma-controller@...00000 {
 			compatible = "microchip,sama7d65-dma", "microchip,sama7g5-dma";
 			reg = <0xe1200000 0x1000>;
-- 
2.34.1