[PATCH 0/5] Add missing vdda-supply to STM32 ADC

[PATCH 0/5] Add missing vdda-supply to STM32 ADC

[Fabrice Gasnier]

Add missing vdda-supply, analog power supply, to STM32 ADC. When vdda is
an independent supply, it needs to be properly turned on or off to supply
the ADC.
This series proposes fixes for the dt-bindings, IIO driver and relevant
device tree files.

Fabrice Gasnier (5):
  dt-bindings: iio: adc: stm32: add missing vdda supply
  iio: adc: stm32-adc: add missing vdda-supply
  ARM: dts: stm32: remove fixed regulator unit address on stm32429i-eval
  ARM: dts: stm32: add missing vdda-supply to adc on stm32429i-eval
  ARM: dts: stm32: add missing vdda-supply to adc on stm32h743i-eval

 .../devicetree/bindings/iio/adc/st,stm32-adc.txt   |  1 +
 arch/arm/boot/dts/stm32429i-eval.dts               | 25 +++++++++++-----------
 arch/arm/boot/dts/stm32h743i-eval.dts              |  1 +
 drivers/iio/adc/stm32-adc-core.c                   | 21 +++++++++++++++++-
 4 files changed, 35 insertions(+), 13 deletions(-)

-- 
2.7.4


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[PATCH 1/5] dt-bindings: iio: adc: stm32: add missing vdda supply

[Fabrice Gasnier]

Add missing vdda-supply, analog power supply, to STM32 ADC. It's required
to properly supply the ADC.

Fixes: 841fcea454fe ("Documentation: dt-bindings: Document STM32 ADC DT
bindings")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
index 8346bcb..93a0bd2 100644
--- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
+++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
@@ -38,6 +38,7 @@ Required properties:
     It's required on stm32h7.
 - clock-names: Must be "adc" and/or "bus" depending on part used.
 - interrupt-controller: Identifies the controller node as interrupt-parent
+- vdda-supply: Phandle to the vdda input analog voltage.
 - vref-supply: Phandle to the vref input analog reference voltage.
 - #interrupt-cells = <1>;
 - #address-cells = <1>;
-- 
2.7.4


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[PATCH 2/5] iio: adc: stm32-adc: add missing vdda-supply

[Fabrice Gasnier]

Add missing vdda-supply, analog power supply, to STM32 ADC. When vdda is
an independent supply, it needs to be properly turned on or off to supply
the ADC.

Fixes: 1add69880240 ("iio: adc: Add support for STM32 ADC core").

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 drivers/iio/adc/stm32-adc-core.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
index 2327ec1..1f7ce51 100644
--- a/drivers/iio/adc/stm32-adc-core.c
+++ b/drivers/iio/adc/stm32-adc-core.c
@@ -87,6 +87,7 @@ struct stm32_adc_priv_cfg {
  * @domain:		irq domain reference
  * @aclk:		clock reference for the analog circuitry
  * @bclk:		bus clock common for all ADCs, depends on part used
+ * @vdda:		vdda analog supply reference
  * @vref:		regulator reference
  * @cfg:		compatible configuration data
  * @common:		common data for all ADC instances
@@ -97,6 +98,7 @@ struct stm32_adc_priv {
 	struct irq_domain		*domain;
 	struct clk			*aclk;
 	struct clk			*bclk;
+	struct regulator		*vdda;
 	struct regulator		*vref;
 	const struct stm32_adc_priv_cfg	*cfg;
 	struct stm32_adc_common		common;
@@ -394,10 +396,16 @@ static int stm32_adc_core_hw_start(struct device *dev)
 	struct stm32_adc_priv *priv = to_stm32_adc_priv(common);
 	int ret;
 
+	ret = regulator_enable(priv->vdda);
+	if (ret < 0) {
+		dev_err(dev, "vdda enable failed %d\n", ret);
+		return ret;
+	}
+
 	ret = regulator_enable(priv->vref);
 	if (ret < 0) {
 		dev_err(dev, "vref enable failed\n");
-		return ret;
+		goto err_vdda_disable;
 	}
 
 	if (priv->bclk) {
@@ -425,6 +433,8 @@ static int stm32_adc_core_hw_start(struct device *dev)
 		clk_disable_unprepare(priv->bclk);
 err_regulator_disable:
 	regulator_disable(priv->vref);
+err_vdda_disable:
+	regulator_disable(priv->vdda);
 
 	return ret;
 }
@@ -441,6 +451,7 @@ static void stm32_adc_core_hw_stop(struct device *dev)
 	if (priv->bclk)
 		clk_disable_unprepare(priv->bclk);
 	regulator_disable(priv->vref);
+	regulator_disable(priv->vdda);
 }
 
 static int stm32_adc_probe(struct platform_device *pdev)
@@ -468,6 +479,14 @@ static int stm32_adc_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->common.base);
 	priv->common.phys_base = res->start;
 
+	priv->vdda = devm_regulator_get(&pdev->dev, "vdda");
+	if (IS_ERR(priv->vdda)) {
+		ret = PTR_ERR(priv->vdda);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev, "vdda get failed, %d\n", ret);
+		return ret;
+	}
+
 	priv->vref = devm_regulator_get(&pdev->dev, "vref");
 	if (IS_ERR(priv->vref)) {
 		ret = PTR_ERR(priv->vref);
-- 
2.7.4


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[PATCH 3/5] ARM: dts: stm32: remove fixed regulator unit address on stm32429i-eval

[Fabrice Gasnier]

vref fixed regulator shouldn't have unit address and reg properties.
Rename the label and phandle to "vref" according to the schematics.
Also remove it from simple-bus.

Fixes: 7465d81191a1 ("ARM: dts: stm32: enable ADC on stm32f429i-eval
board")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 arch/arm/boot/dts/stm32429i-eval.dts | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
index 73ea84d..d79f58f 100644
--- a/arch/arm/boot/dts/stm32429i-eval.dts
+++ b/arch/arm/boot/dts/stm32429i-eval.dts
@@ -81,18 +81,12 @@
 		dma-ranges = <0xc0000000 0x0 0x10000000>;
 	};
 
-	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>;
-		};
+	vref: regulator-vref {
+		compatible = "regulator-fixed";
+		regulator-name = "vref";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
 	};
 
 	leds {
@@ -157,7 +151,7 @@
 &adc {
 	pinctrl-names = "default";
 	pinctrl-0 = <&adc3_in8_pin>;
-	vref-supply = <&reg_vref>;
+	vref-supply = <&vref>;
 	status = "okay";
 	adc3: adc@200 {
 		st,adc-channels = <8>;
-- 
2.7.4


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[PATCH 4/5] ARM: dts: stm32: add missing vdda-supply to adc on stm32429i-eval

[Fabrice Gasnier]

Add missing vdda-supply required by STM32 ADC.

Fixes: 7465d81191a1 ("ARM: dts: stm32: enable ADC on stm32f429i-eval
board")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 arch/arm/boot/dts/stm32429i-eval.dts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/stm32429i-eval.dts b/arch/arm/boot/dts/stm32429i-eval.dts
index d79f58f..ba08624 100644
--- a/arch/arm/boot/dts/stm32429i-eval.dts
+++ b/arch/arm/boot/dts/stm32429i-eval.dts
@@ -81,6 +81,12 @@
 		dma-ranges = <0xc0000000 0x0 0x10000000>;
 	};
 
+	vdda: regulator-vdda {
+		compatible = "regulator-fixed";
+		regulator-name = "vdda";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+	};
 
 	vref: regulator-vref {
 		compatible = "regulator-fixed";
@@ -151,6 +157,7 @@
 &adc {
 	pinctrl-names = "default";
 	pinctrl-0 = <&adc3_in8_pin>;
+	vdda-supply = <&vdda>;
 	vref-supply = <&vref>;
 	status = "okay";
 	adc3: adc@200 {
-- 
2.7.4


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[PATCH 5/5] ARM: dts: stm32: add missing vdda-supply to adc on stm32h743i-eval

[Fabrice Gasnier]

Add missing vdda-supply required by STM32 ADC.

Fixes: 090992a9ca54 ("ARM: dts: stm32: enable ADC on stm32h743i-eval
board")

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
 arch/arm/boot/dts/stm32h743i-eval.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/stm32h743i-eval.dts b/arch/arm/boot/dts/stm32h743i-eval.dts
index ab78ad5..e4d3c58 100644
--- a/arch/arm/boot/dts/stm32h743i-eval.dts
+++ b/arch/arm/boot/dts/stm32h743i-eval.dts
@@ -87,6 +87,7 @@
 };
 
 &adc_12 {
+	vdda-supply = <&vdda>;
 	vref-supply = <&vdda>;
 	status = "okay";
 	adc1: adc@0 {
-- 
2.7.4


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Re: [PATCH 1/5] dt-bindings: iio: adc: stm32: add missing vdda supply

[Jonathan Cameron]

On Wed, 19 Jun 2019 14:29:54 +0200
Fabrice Gasnier <fabrice.gasnier@st.com> wrote:

> Add missing vdda-supply, analog power supply, to STM32 ADC. It's required
> to properly supply the ADC.
> 
> Fixes: 841fcea454fe ("Documentation: dt-bindings: Document STM32 ADC DT
> bindings")
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to ignore completely.

thanks,

Jonathan

> ---
>  Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
> index 8346bcb..93a0bd2 100644
> --- a/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
> +++ b/Documentation/devicetree/bindings/iio/adc/st,stm32-adc.txt
> @@ -38,6 +38,7 @@ Required properties:
>      It's required on stm32h7.
>  - clock-names: Must be "adc" and/or "bus" depending on part used.
>  - interrupt-controller: Identifies the controller node as interrupt-parent
> +- vdda-supply: Phandle to the vdda input analog voltage.
>  - vref-supply: Phandle to the vref input analog reference voltage.
>  - #interrupt-cells = <1>;
>  - #address-cells = <1>;


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Re: [PATCH 2/5] iio: adc: stm32-adc: add missing vdda-supply

[Jonathan Cameron]

On Wed, 19 Jun 2019 14:29:55 +0200
Fabrice Gasnier <fabrice.gasnier@st.com> wrote:

> Add missing vdda-supply, analog power supply, to STM32 ADC. When vdda is
> an independent supply, it needs to be properly turned on or off to supply
> the ADC.
> 
> Fixes: 1add69880240 ("iio: adc: Add support for STM32 ADC core").
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
I'm going to assume there is a board out there where this matters as that
doesn't seem to be the case for the two in tree dts files so I've
marked it for stable.

Going via togreg branch however rather than fixes as we are late in this
cycle so this can wait for the merge window.

Thanks,

Jonathan


> ---
>  drivers/iio/adc/stm32-adc-core.c | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
> index 2327ec1..1f7ce51 100644
> --- a/drivers/iio/adc/stm32-adc-core.c
> +++ b/drivers/iio/adc/stm32-adc-core.c
> @@ -87,6 +87,7 @@ struct stm32_adc_priv_cfg {
>   * @domain:		irq domain reference
>   * @aclk:		clock reference for the analog circuitry
>   * @bclk:		bus clock common for all ADCs, depends on part used
> + * @vdda:		vdda analog supply reference
>   * @vref:		regulator reference
>   * @cfg:		compatible configuration data
>   * @common:		common data for all ADC instances
> @@ -97,6 +98,7 @@ struct stm32_adc_priv {
>  	struct irq_domain		*domain;
>  	struct clk			*aclk;
>  	struct clk			*bclk;
> +	struct regulator		*vdda;
>  	struct regulator		*vref;
>  	const struct stm32_adc_priv_cfg	*cfg;
>  	struct stm32_adc_common		common;
> @@ -394,10 +396,16 @@ static int stm32_adc_core_hw_start(struct device *dev)
>  	struct stm32_adc_priv *priv = to_stm32_adc_priv(common);
>  	int ret;
>  
> +	ret = regulator_enable(priv->vdda);
> +	if (ret < 0) {
> +		dev_err(dev, "vdda enable failed %d\n", ret);
> +		return ret;
> +	}
> +
>  	ret = regulator_enable(priv->vref);
>  	if (ret < 0) {
>  		dev_err(dev, "vref enable failed\n");
> -		return ret;
> +		goto err_vdda_disable;
>  	}
>  
>  	if (priv->bclk) {
> @@ -425,6 +433,8 @@ static int stm32_adc_core_hw_start(struct device *dev)
>  		clk_disable_unprepare(priv->bclk);
>  err_regulator_disable:
>  	regulator_disable(priv->vref);
> +err_vdda_disable:
> +	regulator_disable(priv->vdda);
>  
>  	return ret;
>  }
> @@ -441,6 +451,7 @@ static void stm32_adc_core_hw_stop(struct device *dev)
>  	if (priv->bclk)
>  		clk_disable_unprepare(priv->bclk);
>  	regulator_disable(priv->vref);
> +	regulator_disable(priv->vdda);
>  }
>  
>  static int stm32_adc_probe(struct platform_device *pdev)
> @@ -468,6 +479,14 @@ static int stm32_adc_probe(struct platform_device *pdev)
>  		return PTR_ERR(priv->common.base);
>  	priv->common.phys_base = res->start;
>  
> +	priv->vdda = devm_regulator_get(&pdev->dev, "vdda");
> +	if (IS_ERR(priv->vdda)) {
> +		ret = PTR_ERR(priv->vdda);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(&pdev->dev, "vdda get failed, %d\n", ret);
> +		return ret;
> +	}
> +
>  	priv->vref = devm_regulator_get(&pdev->dev, "vref");
>  	if (IS_ERR(priv->vref)) {
>  		ret = PTR_ERR(priv->vref);


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Re: [PATCH 0/5] Add missing vdda-supply to STM32 ADC

[Alexandre Torgue]

Hi Fabrice

On 6/19/19 2:29 PM, Fabrice Gasnier wrote:
> Add missing vdda-supply, analog power supply, to STM32 ADC. When vdda is
> an independent supply, it needs to be properly turned on or off to supply
> the ADC.
> This series proposes fixes for the dt-bindings, IIO driver and relevant
> device tree files.
> 
> Fabrice Gasnier (5):
>    dt-bindings: iio: adc: stm32: add missing vdda supply
>    iio: adc: stm32-adc: add missing vdda-supply
>    ARM: dts: stm32: remove fixed regulator unit address on stm32429i-eval
>    ARM: dts: stm32: add missing vdda-supply to adc on stm32429i-eval
>    ARM: dts: stm32: add missing vdda-supply to adc on stm32h743i-eval
> 
>   .../devicetree/bindings/iio/adc/st,stm32-adc.txt   |  1 +
>   arch/arm/boot/dts/stm32429i-eval.dts               | 25 +++++++++++-----------
>   arch/arm/boot/dts/stm32h743i-eval.dts              |  1 +
>   drivers/iio/adc/stm32-adc-core.c                   | 21 +++++++++++++++++-
>   4 files changed, 35 insertions(+), 13 deletions(-)
> 

DT patches applied on stm32-next. I plan to add them in my PR for v5.4.
However those patches are marked as "fixes", do you see an issue to only 
send it for v5.4 ?

Regards
alex

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