[PATCH 0/3] Enable ADC on STM32

[PATCH 0/3] Enable ADC on STM32

[Fabrice Gasnier]

Enable minimal configuration and device tree to support ADC on STM32,
using ADC driver: https://lwn.net/Articles/706445/

Simple test on stm32f429i-eval board, using on-board potentiometer:
- cd /sys/bus/iio/devices/iio\:device0/
- cat in_voltage8_raw

Fabrice Gasnier (3):
  ARM: configs: stm32: enable ADC driver
  ARM: dts: stm32: Add ADC support to stm32f429
  ARM: dts: stm32: enable ADC on stm32f429i-eval board

 arch/arm/boot/dts/stm32429i-eval.dts | 25 ++++++++++++++++++
 arch/arm/boot/dts/stm32f429.dtsi     | 49 ++++++++++++++++++++++++++++++++++++
 arch/arm/configs/stm32_defconfig     |  5 ++++
 3 files changed, 79 insertions(+)

-- 
1.9.1

[PATCH 1/3] ARM: configs: stm32: enable ADC driver

[Fabrice Gasnier]

ADC driver depends on REGULATOR and IIO that are not yet selected.
Current hardware boards (like stm32f429i-eval) is using fixed
regulators.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 arch/arm/configs/stm32_defconfig | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
index a60b5cb..92ccc3c 100644
--- a/arch/arm/configs/stm32_defconfig
+++ b/arch/arm/configs/stm32_defconfig
@@ -49,6 +49,8 @@ CONFIG_SERIAL_STM32=y
 CONFIG_SERIAL_STM32_CONSOLE=y
 # CONFIG_HW_RANDOM is not set
 # CONFIG_HWMON is not set
+CONFIG_REGULATOR=y
+CONFIG_REGULATOR_FIXED_VOLTAGE=y
 # CONFIG_USB_SUPPORT is not set
 CONFIG_NEW_LEDS=y
 CONFIG_LEDS_CLASS=y
@@ -57,6 +59,9 @@ CONFIG_LEDS_TRIGGERS=y
 CONFIG_LEDS_TRIGGER_HEARTBEAT=y
 CONFIG_DMADEVICES=y
 CONFIG_STM32_DMA=y
+CONFIG_IIO=y
+CONFIG_STM32_ADC_CORE=y
+CONFIG_STM32_ADC=y
 # CONFIG_FILE_LOCKING is not set
 # CONFIG_DNOTIFY is not set
 # CONFIG_INOTIFY_USER is not set
-- 
1.9.1

[PATCH 2/3] ARM: dts: stm32: Add ADC support to stm32f429

[Fabrice Gasnier]

Add ADC support & pinctrl analog phandle (adc3_in8) to stm32f429.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 arch/arm/boot/dts/stm32f429.dtsi | 49 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
index 3dd47eb..be1d970 100644
--- a/arch/arm/boot/dts/stm32f429.dtsi
+++ b/arch/arm/boot/dts/stm32f429.dtsi
@@ -172,6 +172,49 @@
 			status = "disabled";
 		};
 
+		adc: adc@40012000 {
+			compatible = "st,stm32f4-adc-core";
+			reg = <0x40012000 0x400>;
+			interrupts = <18>;
+			clocks = <&rcc 0 168>;
+			clock-names = "adc";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+
+			adc1: adc@0 {
+				compatible = "st,stm32f4-adc";
+				#io-channel-cells = <1>;
+				reg = <0x0>;
+				clocks = <&rcc 0 168>;
+				interrupt-parent = <&adc>;
+				interrupts = <0>;
+				status = "disabled";
+			};
+
+			adc2: adc@100 {
+				compatible = "st,stm32f4-adc";
+				#io-channel-cells = <1>;
+				reg = <0x100>;
+				clocks = <&rcc 0 169>;
+				interrupt-parent = <&adc>;
+				interrupts = <1>;
+				status = "disabled";
+			};
+
+			adc3: adc@200 {
+				compatible = "st,stm32f4-adc";
+				#io-channel-cells = <1>;
+				reg = <0x200>;
+				clocks = <&rcc 0 170>;
+				interrupt-parent = <&adc>;
+				interrupts = <2>;
+				status = "disabled";
+			};
+		};
+
 		syscfg: system-config@40013800 {
 			compatible = "syscon";
 			reg = <0x40013800 0x400>;
@@ -334,6 +377,12 @@
 					slew-rate = <2>;
 				};
 			};
+
+			adc3_in8_pin: adc@200 {
+				pins {
+					pinmux = <STM32F429_PF10_FUNC_ANALOG>;
+				};
+			};
 		};
 
 		rcc: rcc@40023810 {
-- 
1.9.1

[PATCH 3/3] ARM: dts: stm32: enable ADC on stm32f429i-eval board

[Fabrice Gasnier]

Enable analog to digital converter on stm32f429i-eval board.
It has on-board potentimeter wired to ADC3 in8 analog pin and
uses fixed regulator to provide reference voltage.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 arch/arm/boot/dts/stm32429i-eval.dts | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
index 13c7cd2..6be0a24 100644
--- a/arch/arm/boot/dts/stm32429i-eval.dts
+++ b/arch/arm/boot/dts/stm32429i-eval.dts
@@ -65,6 +65,20 @@
 		serial0 = &usart1;
 	};
 
+	regulators {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		reg_vref: regulator@0 {
+			compatible = "regulator-fixed";
+			reg = <0>;
+			regulator-name = "vref";
+			regulator-min-microvolt = <3300000>;
+			regulator-max-microvolt = <3300000>;
+		};
+	};
+
 	leds {
 		compatible = "gpio-leds";
 		green {
@@ -123,3 +137,14 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&adc {
+	pinctrl-names = "default";
+	pinctrl-0 = <&adc3_in8_pin>;
+	vref-supply = <&reg_vref>;
+	status = "okay";
+	adc3: adc@200 {
+		st,adc-channels = <8>;
+		status = "okay";
+	};
+};
-- 
1.9.1

Re: [PATCH 1/3] ARM: configs: stm32: enable ADC driver

[Alexandre Torgue]

Hi Fabrice

On 12/02/2016 02:57 PM, Fabrice GASNIER wrote:
> ADC driver depends on REGULATOR and IIO that are not yet selected.
> Current hardware boards (like stm32f429i-eval) is using fixed
> regulators.
>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> ---
>  arch/arm/configs/stm32_defconfig | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/arm/configs/stm32_defconfig b/arch/arm/configs/stm32_defconfig
> index a60b5cb..92ccc3c 100644
> --- a/arch/arm/configs/stm32_defconfig
> +++ b/arch/arm/configs/stm32_defconfig
> @@ -49,6 +49,8 @@ CONFIG_SERIAL_STM32=y
>  CONFIG_SERIAL_STM32_CONSOLE=y
>  # CONFIG_HW_RANDOM is not set
>  # CONFIG_HWMON is not set
> +CONFIG_REGULATOR=y
> +CONFIG_REGULATOR_FIXED_VOLTAGE=y
>  # CONFIG_USB_SUPPORT is not set
>  CONFIG_NEW_LEDS=y
>  CONFIG_LEDS_CLASS=y
> @@ -57,6 +59,9 @@ CONFIG_LEDS_TRIGGERS=y
>  CONFIG_LEDS_TRIGGER_HEARTBEAT=y
>  CONFIG_DMADEVICES=y
>  CONFIG_STM32_DMA=y
> +CONFIG_IIO=y
> +CONFIG_STM32_ADC_CORE=y
> +CONFIG_STM32_ADC=y
>  # CONFIG_FILE_LOCKING is not set
>  # CONFIG_DNOTIFY is not set
>  # CONFIG_INOTIFY_USER is not set
>

Applied on stm32-defconfig-for-v4.11

Thanks.

Alex

Re: [PATCH 2/3] ARM: dts: stm32: Add ADC support to stm32f429

[Alexandre Torgue]

Hi Fabrice

On 12/02/2016 02:57 PM, Fabrice GASNIER wrote:
> Add ADC support & pinctrl analog phandle (adc3_in8) to stm32f429.
>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> ---
>  arch/arm/boot/dts/stm32f429.dtsi | 49 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32f429.dtsi b/arch/arm/boot/dts/stm32f429.dtsi
> index 3dd47eb..be1d970 100644
> --- a/arch/arm/boot/dts/stm32f429.dtsi
> +++ b/arch/arm/boot/dts/stm32f429.dtsi
> @@ -172,6 +172,49 @@
>  			status = "disabled";
>  		};
>
> +		adc: adc@40012000 {
> +			compatible = "st,stm32f4-adc-core";
> +			reg = <0x40012000 0x400>;
> +			interrupts = <18>;
> +			clocks = <&rcc 0 168>;
> +			clock-names = "adc";
> +			interrupt-controller;
> +			#interrupt-cells = <1>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			status = "disabled";
> +
> +			adc1: adc@0 {
> +				compatible = "st,stm32f4-adc";
> +				#io-channel-cells = <1>;
> +				reg = <0x0>;
> +				clocks = <&rcc 0 168>;
> +				interrupt-parent = <&adc>;
> +				interrupts = <0>;
> +				status = "disabled";
> +			};
> +
> +			adc2: adc@100 {
> +				compatible = "st,stm32f4-adc";
> +				#io-channel-cells = <1>;
> +				reg = <0x100>;
> +				clocks = <&rcc 0 169>;
> +				interrupt-parent = <&adc>;
> +				interrupts = <1>;
> +				status = "disabled";
> +			};
> +
> +			adc3: adc@200 {
> +				compatible = "st,stm32f4-adc";
> +				#io-channel-cells = <1>;
> +				reg = <0x200>;
> +				clocks = <&rcc 0 170>;
> +				interrupt-parent = <&adc>;
> +				interrupts = <2>;
> +				status = "disabled";
> +			};
> +		};
> +
>  		syscfg: system-config@40013800 {
>  			compatible = "syscon";
>  			reg = <0x40013800 0x400>;
> @@ -334,6 +377,12 @@
>  					slew-rate = <2>;
>  				};
>  			};
> +
> +			adc3_in8_pin: adc@200 {
> +				pins {
> +					pinmux = <STM32F429_PF10_FUNC_ANALOG>;
> +				};
> +			};
>  		};
>
>  		rcc: rcc@40023810 {
>

Applied on stm32-dt-for-v4.11

Thanks
Alex

Re: [PATCH 3/3] ARM: dts: stm32: enable ADC on stm32f429i-eval board

[Alexandre Torgue]

Hi Fabrice

On 12/02/2016 02:57 PM, Fabrice GASNIER wrote:
> Enable analog to digital converter on stm32f429i-eval board.
> It has on-board potentimeter wired to ADC3 in8 analog pin and
> uses fixed regulator to provide reference voltage.
>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> ---
>  arch/arm/boot/dts/stm32429i-eval.dts | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
> index 13c7cd2..6be0a24 100644
> --- a/arch/arm/boot/dts/stm32429i-eval.dts
> +++ b/arch/arm/boot/dts/stm32429i-eval.dts
> @@ -65,6 +65,20 @@
>  		serial0 = &usart1;
>  	};
>
> +	regulators {
> +		compatible = "simple-bus";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		reg_vref: regulator@0 {
> +			compatible = "regulator-fixed";
> +			reg = <0>;
> +			regulator-name = "vref";
> +			regulator-min-microvolt = <3300000>;
> +			regulator-max-microvolt = <3300000>;
> +		};
> +	};
> +
>  	leds {
>  		compatible = "gpio-leds";
>  		green {
> @@ -123,3 +137,14 @@
>  	pinctrl-names = "default";
>  	status = "okay";
>  };
> +
> +&adc {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&adc3_in8_pin>;
> +	vref-supply = <&reg_vref>;
> +	status = "okay";
> +	adc3: adc@200 {
> +		st,adc-channels = <8>;
> +		status = "okay";
> +	};
> +};
>
After node reordering:

Applied on stm32-dt-for-v4.11

Thanks
Alex