This is a note to let you know that I've just added the patch titled
iio: adc: stm32-adc: add missing vdda-supply
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-next branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will also be merged in the next major kernel release
during the merge window.
If you have any questions about this process, please let me know.
>From 7685010fca2ba0284f31fd1380df3cffc96d847e Mon Sep 17 00:00:00 2001
From: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
Date: Wed, 19 Jun 2019 14:29:55 +0200
Subject: iio: adc: stm32-adc: add missing vdda-supply
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.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx>
Fixes: 1add69880240 ("iio: adc: Add support for STM32 ADC core").
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
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 2327ec18b40c..1f7ce5186dfc 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);
--
2.22.0
