* [PATCH v2] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe
@ 2021-08-06 10:55 ` Simon Xue
0 siblings, 0 replies; 8+ messages in thread
From: Simon Xue @ 2021-08-06 10:55 UTC (permalink / raw)
To: Jonathan Cameron
Cc: linux-rockchip, devicetree, robh+dt, Johan Jonker,
Heiko Stuebner, Lars-Peter Clausen, Peter Meerwald-Stadler,
linux-iio, David Wu, Simon Xue
From: David Wu <david.wu@rock-chips.com>
Add voltage notifier, no need to query regulator voltage for
every saradc read, just get regulator voltage once at probe.
Signed-off-by: Simon Xue <xxm@rock-chips.com>
Signed-off-by: David Wu <david.wu@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
---
drivers/iio/adc/rockchip_saradc.c | 47 ++++++++++++++++++++++++++-----
1 file changed, 40 insertions(+), 7 deletions(-)
diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index f3eb8d2e50dc..295da1ad6edb 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -49,10 +49,12 @@ struct rockchip_saradc {
struct clk *clk;
struct completion completion;
struct regulator *vref;
+ int uv_vref;
struct reset_control *reset;
const struct rockchip_saradc_data *data;
u16 last_val;
const struct iio_chan_spec *last_chan;
+ struct notifier_block nb;
};
static void rockchip_saradc_power_down(struct rockchip_saradc *info)
@@ -105,13 +107,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
mutex_unlock(&indio_dev->mlock);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- ret = regulator_get_voltage(info->vref);
- if (ret < 0) {
- dev_err(&indio_dev->dev, "failed to get voltage\n");
- return ret;
- }
-
- *val = ret / 1000;
+ *val = info->uv_vref / 1000;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
@@ -298,6 +294,26 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
return IRQ_HANDLED;
}
+static int rockchip_saradc_volt_notify(struct notifier_block *nb,
+ unsigned long event,
+ void *data)
+{
+ struct rockchip_saradc *info =
+ container_of(nb, struct rockchip_saradc, nb);
+
+ if (event & REGULATOR_EVENT_VOLTAGE_CHANGE)
+ info->uv_vref = (unsigned long)data;
+
+ return NOTIFY_OK;
+}
+
+static void rockchip_saradc_regulator_action(void *data)
+{
+ struct rockchip_saradc *info = data;
+
+ regulator_unregister_notifier(info->vref, &info->nb);
+}
+
static int rockchip_saradc_probe(struct platform_device *pdev)
{
struct rockchip_saradc *info = NULL;
@@ -410,6 +426,13 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
return ret;
}
+ info->uv_vref = regulator_get_voltage(info->vref);
+ if (info->uv_vref < 0) {
+ dev_err(&pdev->dev, "failed to get voltage\n");
+ ret = info->uv_vref;
+ return ret;
+ }
+
ret = clk_prepare_enable(info->pclk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to enable pclk\n");
@@ -450,6 +473,16 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
if (ret)
return ret;
+ info->nb.notifier_call = rockchip_saradc_volt_notify;
+ ret = regulator_register_notifier(info->vref, &info->nb);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(&pdev->dev,
+ rockchip_saradc_regulator_action, info);
+ if (ret)
+ return ret;
+
return devm_iio_device_register(&pdev->dev, indio_dev);
}
--
2.25.1
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply related [flat|nested] 8+ messages in thread* Re: [PATCH v2] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe
2021-08-06 10:55 ` Simon Xue
@ 2021-08-06 11:06 ` Heiko Stübner
-1 siblings, 0 replies; 8+ messages in thread
From: Heiko Stübner @ 2021-08-06 11:06 UTC (permalink / raw)
To: Jonathan Cameron, Simon Xue
Cc: linux-rockchip, devicetree, robh+dt, Johan Jonker,
Lars-Peter Clausen, Peter Meerwald-Stadler, linux-iio, David Wu,
Simon Xue
Am Freitag, 6. August 2021, 12:55:24 CEST schrieb Simon Xue:
> From: David Wu <david.wu@rock-chips.com>
>
> Add voltage notifier, no need to query regulator voltage for
> every saradc read, just get regulator voltage once at probe.
>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: David Wu <david.wu@rock-chips.com>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
patch looks great to me now :-)
Thanks
Heiko
> ---
> drivers/iio/adc/rockchip_saradc.c | 47 ++++++++++++++++++++++++++-----
> 1 file changed, 40 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
> index f3eb8d2e50dc..295da1ad6edb 100644
> --- a/drivers/iio/adc/rockchip_saradc.c
> +++ b/drivers/iio/adc/rockchip_saradc.c
> @@ -49,10 +49,12 @@ struct rockchip_saradc {
> struct clk *clk;
> struct completion completion;
> struct regulator *vref;
> + int uv_vref;
> struct reset_control *reset;
> const struct rockchip_saradc_data *data;
> u16 last_val;
> const struct iio_chan_spec *last_chan;
> + struct notifier_block nb;
> };
>
> static void rockchip_saradc_power_down(struct rockchip_saradc *info)
> @@ -105,13 +107,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
> mutex_unlock(&indio_dev->mlock);
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_SCALE:
> - ret = regulator_get_voltage(info->vref);
> - if (ret < 0) {
> - dev_err(&indio_dev->dev, "failed to get voltage\n");
> - return ret;
> - }
> -
> - *val = ret / 1000;
> + *val = info->uv_vref / 1000;
> *val2 = chan->scan_type.realbits;
> return IIO_VAL_FRACTIONAL_LOG2;
> default:
> @@ -298,6 +294,26 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
> return IRQ_HANDLED;
> }
>
> +static int rockchip_saradc_volt_notify(struct notifier_block *nb,
> + unsigned long event,
> + void *data)
> +{
> + struct rockchip_saradc *info =
> + container_of(nb, struct rockchip_saradc, nb);
> +
> + if (event & REGULATOR_EVENT_VOLTAGE_CHANGE)
> + info->uv_vref = (unsigned long)data;
> +
> + return NOTIFY_OK;
> +}
> +
> +static void rockchip_saradc_regulator_action(void *data)
> +{
> + struct rockchip_saradc *info = data;
> +
> + regulator_unregister_notifier(info->vref, &info->nb);
> +}
> +
> static int rockchip_saradc_probe(struct platform_device *pdev)
> {
> struct rockchip_saradc *info = NULL;
> @@ -410,6 +426,13 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> return ret;
> }
>
> + info->uv_vref = regulator_get_voltage(info->vref);
> + if (info->uv_vref < 0) {
> + dev_err(&pdev->dev, "failed to get voltage\n");
> + ret = info->uv_vref;
> + return ret;
> + }
> +
> ret = clk_prepare_enable(info->pclk);
> if (ret < 0) {
> dev_err(&pdev->dev, "failed to enable pclk\n");
> @@ -450,6 +473,16 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> if (ret)
> return ret;
>
> + info->nb.notifier_call = rockchip_saradc_volt_notify;
> + ret = regulator_register_notifier(info->vref, &info->nb);
> + if (ret)
> + return ret;
> +
> + ret = devm_add_action_or_reset(&pdev->dev,
> + rockchip_saradc_regulator_action, info);
> + if (ret)
> + return ret;
> +
> return devm_iio_device_register(&pdev->dev, indio_dev);
> }
>
>
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH v2] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe
@ 2021-08-06 11:06 ` Heiko Stübner
0 siblings, 0 replies; 8+ messages in thread
From: Heiko Stübner @ 2021-08-06 11:06 UTC (permalink / raw)
To: Jonathan Cameron, Simon Xue
Cc: linux-rockchip, devicetree, robh+dt, Johan Jonker,
Lars-Peter Clausen, Peter Meerwald-Stadler, linux-iio, David Wu,
Simon Xue
Am Freitag, 6. August 2021, 12:55:24 CEST schrieb Simon Xue:
> From: David Wu <david.wu@rock-chips.com>
>
> Add voltage notifier, no need to query regulator voltage for
> every saradc read, just get regulator voltage once at probe.
>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: David Wu <david.wu@rock-chips.com>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
patch looks great to me now :-)
Thanks
Heiko
> ---
> drivers/iio/adc/rockchip_saradc.c | 47 ++++++++++++++++++++++++++-----
> 1 file changed, 40 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
> index f3eb8d2e50dc..295da1ad6edb 100644
> --- a/drivers/iio/adc/rockchip_saradc.c
> +++ b/drivers/iio/adc/rockchip_saradc.c
> @@ -49,10 +49,12 @@ struct rockchip_saradc {
> struct clk *clk;
> struct completion completion;
> struct regulator *vref;
> + int uv_vref;
> struct reset_control *reset;
> const struct rockchip_saradc_data *data;
> u16 last_val;
> const struct iio_chan_spec *last_chan;
> + struct notifier_block nb;
> };
>
> static void rockchip_saradc_power_down(struct rockchip_saradc *info)
> @@ -105,13 +107,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
> mutex_unlock(&indio_dev->mlock);
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_SCALE:
> - ret = regulator_get_voltage(info->vref);
> - if (ret < 0) {
> - dev_err(&indio_dev->dev, "failed to get voltage\n");
> - return ret;
> - }
> -
> - *val = ret / 1000;
> + *val = info->uv_vref / 1000;
> *val2 = chan->scan_type.realbits;
> return IIO_VAL_FRACTIONAL_LOG2;
> default:
> @@ -298,6 +294,26 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
> return IRQ_HANDLED;
> }
>
> +static int rockchip_saradc_volt_notify(struct notifier_block *nb,
> + unsigned long event,
> + void *data)
> +{
> + struct rockchip_saradc *info =
> + container_of(nb, struct rockchip_saradc, nb);
> +
> + if (event & REGULATOR_EVENT_VOLTAGE_CHANGE)
> + info->uv_vref = (unsigned long)data;
> +
> + return NOTIFY_OK;
> +}
> +
> +static void rockchip_saradc_regulator_action(void *data)
> +{
> + struct rockchip_saradc *info = data;
> +
> + regulator_unregister_notifier(info->vref, &info->nb);
> +}
> +
> static int rockchip_saradc_probe(struct platform_device *pdev)
> {
> struct rockchip_saradc *info = NULL;
> @@ -410,6 +426,13 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> return ret;
> }
>
> + info->uv_vref = regulator_get_voltage(info->vref);
> + if (info->uv_vref < 0) {
> + dev_err(&pdev->dev, "failed to get voltage\n");
> + ret = info->uv_vref;
> + return ret;
> + }
> +
> ret = clk_prepare_enable(info->pclk);
> if (ret < 0) {
> dev_err(&pdev->dev, "failed to enable pclk\n");
> @@ -450,6 +473,16 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> if (ret)
> return ret;
>
> + info->nb.notifier_call = rockchip_saradc_volt_notify;
> + ret = regulator_register_notifier(info->vref, &info->nb);
> + if (ret)
> + return ret;
> +
> + ret = devm_add_action_or_reset(&pdev->dev,
> + rockchip_saradc_regulator_action, info);
> + if (ret)
> + return ret;
> +
> return devm_iio_device_register(&pdev->dev, indio_dev);
> }
>
>
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe
2021-08-06 10:55 ` Simon Xue
@ 2021-08-07 10:36 ` Andy Shevchenko
-1 siblings, 0 replies; 8+ messages in thread
From: Andy Shevchenko @ 2021-08-07 10:36 UTC (permalink / raw)
To: Simon Xue
Cc: Jonathan Cameron, open list:ARM/Rockchip SoC...,
devicetree, Rob Herring, Johan Jonker, Heiko Stuebner,
Lars-Peter Clausen, Peter Meerwald-Stadler, linux-iio, David Wu
On Fri, Aug 6, 2021 at 6:24 PM Simon Xue <xxm@rock-chips.com> wrote:
>
> From: David Wu <david.wu@rock-chips.com>
>
> Add voltage notifier, no need to query regulator voltage for
> every saradc read, just get regulator voltage once at probe.
>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: David Wu <david.wu@rock-chips.com>
The order of SoB tags seems wrong or Co-developed-by is missed.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe
@ 2021-08-07 10:36 ` Andy Shevchenko
0 siblings, 0 replies; 8+ messages in thread
From: Andy Shevchenko @ 2021-08-07 10:36 UTC (permalink / raw)
To: Simon Xue
Cc: Jonathan Cameron, open list:ARM/Rockchip SoC...,
devicetree, Rob Herring, Johan Jonker, Heiko Stuebner,
Lars-Peter Clausen, Peter Meerwald-Stadler, linux-iio, David Wu
On Fri, Aug 6, 2021 at 6:24 PM Simon Xue <xxm@rock-chips.com> wrote:
>
> From: David Wu <david.wu@rock-chips.com>
>
> Add voltage notifier, no need to query regulator voltage for
> every saradc read, just get regulator voltage once at probe.
>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: David Wu <david.wu@rock-chips.com>
The order of SoB tags seems wrong or Co-developed-by is missed.
--
With Best Regards,
Andy Shevchenko
_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH v2] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe
2021-08-06 10:55 ` Simon Xue
@ 2021-08-08 16:48 ` Jonathan Cameron
-1 siblings, 0 replies; 8+ messages in thread
From: Jonathan Cameron @ 2021-08-08 16:48 UTC (permalink / raw)
To: Simon Xue
Cc: linux-rockchip, devicetree, robh+dt, Johan Jonker,
Heiko Stuebner, Lars-Peter Clausen, Peter Meerwald-Stadler,
linux-iio, David Wu
On Fri, 6 Aug 2021 18:55:24 +0800
Simon Xue <xxm@rock-chips.com> wrote:
> From: David Wu <david.wu@rock-chips.com>
>
> Add voltage notifier, no need to query regulator voltage for
> every saradc read, just get regulator voltage once at probe.
>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: David Wu <david.wu@rock-chips.com>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Looks like Andy's v1 reviews crossed with your v2.
Given you are going to be doing a v3 because of signed-off-by ordering as per Andy's
comments please tidy up the other thing he mentioned (repeated below).
Otherwise looks good to me.
Thanks,
Jonathan
> ---
> drivers/iio/adc/rockchip_saradc.c | 47 ++++++++++++++++++++++++++-----
> 1 file changed, 40 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
> index f3eb8d2e50dc..295da1ad6edb 100644
> --- a/drivers/iio/adc/rockchip_saradc.c
> +++ b/drivers/iio/adc/rockchip_saradc.c
> @@ -49,10 +49,12 @@ struct rockchip_saradc {
> struct clk *clk;
> struct completion completion;
> struct regulator *vref;
> + int uv_vref;
> struct reset_control *reset;
> const struct rockchip_saradc_data *data;
> u16 last_val;
> const struct iio_chan_spec *last_chan;
> + struct notifier_block nb;
> };
>
> static void rockchip_saradc_power_down(struct rockchip_saradc *info)
> @@ -105,13 +107,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
> mutex_unlock(&indio_dev->mlock);
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_SCALE:
> - ret = regulator_get_voltage(info->vref);
> - if (ret < 0) {
> - dev_err(&indio_dev->dev, "failed to get voltage\n");
> - return ret;
> - }
> -
> - *val = ret / 1000;
> + *val = info->uv_vref / 1000;
> *val2 = chan->scan_type.realbits;
> return IIO_VAL_FRACTIONAL_LOG2;
> default:
> @@ -298,6 +294,26 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
> return IRQ_HANDLED;
> }
>
> +static int rockchip_saradc_volt_notify(struct notifier_block *nb,
> + unsigned long event,
> + void *data)
> +{
> + struct rockchip_saradc *info =
> + container_of(nb, struct rockchip_saradc, nb);
> +
> + if (event & REGULATOR_EVENT_VOLTAGE_CHANGE)
> + info->uv_vref = (unsigned long)data;
> +
> + return NOTIFY_OK;
> +}
> +
> +static void rockchip_saradc_regulator_action(void *data)
> +{
> + struct rockchip_saradc *info = data;
> +
> + regulator_unregister_notifier(info->vref, &info->nb);
> +}
> +
> static int rockchip_saradc_probe(struct platform_device *pdev)
> {
> struct rockchip_saradc *info = NULL;
> @@ -410,6 +426,13 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> return ret;
> }
>
> + info->uv_vref = regulator_get_voltage(info->vref);
> + if (info->uv_vref < 0) {
> + dev_err(&pdev->dev, "failed to get voltage\n");
> + ret = info->uv_vref;
> + return ret;
> + }
Andy suggested a cleaner form of this (which I also prefer) is
ret = regulator_get_voltage(info->vref);
if (ret < 0)
return ret;
info->uv_vref = ret;
> +
> ret = clk_prepare_enable(info->pclk);
> if (ret < 0) {
> dev_err(&pdev->dev, "failed to enable pclk\n");
> @@ -450,6 +473,16 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> if (ret)
> return ret;
>
> + info->nb.notifier_call = rockchip_saradc_volt_notify;
> + ret = regulator_register_notifier(info->vref, &info->nb);
> + if (ret)
> + return ret;
> +
> + ret = devm_add_action_or_reset(&pdev->dev,
> + rockchip_saradc_regulator_action, info);
> + if (ret)
> + return ret;
> +
> return devm_iio_device_register(&pdev->dev, indio_dev);
> }
>
^ permalink raw reply [flat|nested] 8+ messages in thread* Re: [PATCH v2] iio: adc: rockchip_saradc: add voltage notifier so get referenced voltage once at probe
@ 2021-08-08 16:48 ` Jonathan Cameron
0 siblings, 0 replies; 8+ messages in thread
From: Jonathan Cameron @ 2021-08-08 16:48 UTC (permalink / raw)
To: Simon Xue
Cc: linux-rockchip, devicetree, robh+dt, Johan Jonker,
Heiko Stuebner, Lars-Peter Clausen, Peter Meerwald-Stadler,
linux-iio, David Wu
On Fri, 6 Aug 2021 18:55:24 +0800
Simon Xue <xxm@rock-chips.com> wrote:
> From: David Wu <david.wu@rock-chips.com>
>
> Add voltage notifier, no need to query regulator voltage for
> every saradc read, just get regulator voltage once at probe.
>
> Signed-off-by: Simon Xue <xxm@rock-chips.com>
> Signed-off-by: David Wu <david.wu@rock-chips.com>
> Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Looks like Andy's v1 reviews crossed with your v2.
Given you are going to be doing a v3 because of signed-off-by ordering as per Andy's
comments please tidy up the other thing he mentioned (repeated below).
Otherwise looks good to me.
Thanks,
Jonathan
> ---
> drivers/iio/adc/rockchip_saradc.c | 47 ++++++++++++++++++++++++++-----
> 1 file changed, 40 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
> index f3eb8d2e50dc..295da1ad6edb 100644
> --- a/drivers/iio/adc/rockchip_saradc.c
> +++ b/drivers/iio/adc/rockchip_saradc.c
> @@ -49,10 +49,12 @@ struct rockchip_saradc {
> struct clk *clk;
> struct completion completion;
> struct regulator *vref;
> + int uv_vref;
> struct reset_control *reset;
> const struct rockchip_saradc_data *data;
> u16 last_val;
> const struct iio_chan_spec *last_chan;
> + struct notifier_block nb;
> };
>
> static void rockchip_saradc_power_down(struct rockchip_saradc *info)
> @@ -105,13 +107,7 @@ static int rockchip_saradc_read_raw(struct iio_dev *indio_dev,
> mutex_unlock(&indio_dev->mlock);
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_SCALE:
> - ret = regulator_get_voltage(info->vref);
> - if (ret < 0) {
> - dev_err(&indio_dev->dev, "failed to get voltage\n");
> - return ret;
> - }
> -
> - *val = ret / 1000;
> + *val = info->uv_vref / 1000;
> *val2 = chan->scan_type.realbits;
> return IIO_VAL_FRACTIONAL_LOG2;
> default:
> @@ -298,6 +294,26 @@ static irqreturn_t rockchip_saradc_trigger_handler(int irq, void *p)
> return IRQ_HANDLED;
> }
>
> +static int rockchip_saradc_volt_notify(struct notifier_block *nb,
> + unsigned long event,
> + void *data)
> +{
> + struct rockchip_saradc *info =
> + container_of(nb, struct rockchip_saradc, nb);
> +
> + if (event & REGULATOR_EVENT_VOLTAGE_CHANGE)
> + info->uv_vref = (unsigned long)data;
> +
> + return NOTIFY_OK;
> +}
> +
> +static void rockchip_saradc_regulator_action(void *data)
> +{
> + struct rockchip_saradc *info = data;
> +
> + regulator_unregister_notifier(info->vref, &info->nb);
> +}
> +
> static int rockchip_saradc_probe(struct platform_device *pdev)
> {
> struct rockchip_saradc *info = NULL;
> @@ -410,6 +426,13 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> return ret;
> }
>
> + info->uv_vref = regulator_get_voltage(info->vref);
> + if (info->uv_vref < 0) {
> + dev_err(&pdev->dev, "failed to get voltage\n");
> + ret = info->uv_vref;
> + return ret;
> + }
Andy suggested a cleaner form of this (which I also prefer) is
ret = regulator_get_voltage(info->vref);
if (ret < 0)
return ret;
info->uv_vref = ret;
> +
> ret = clk_prepare_enable(info->pclk);
> if (ret < 0) {
> dev_err(&pdev->dev, "failed to enable pclk\n");
> @@ -450,6 +473,16 @@ static int rockchip_saradc_probe(struct platform_device *pdev)
> if (ret)
> return ret;
>
> + info->nb.notifier_call = rockchip_saradc_volt_notify;
> + ret = regulator_register_notifier(info->vref, &info->nb);
> + if (ret)
> + return ret;
> +
> + ret = devm_add_action_or_reset(&pdev->dev,
> + rockchip_saradc_regulator_action, info);
> + if (ret)
> + return ret;
> +
> return devm_iio_device_register(&pdev->dev, indio_dev);
> }
>
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