[PATCH 0/2] mfd: atmel-flexcom: add a fix and code cosmetics

[PATCH 0/2] mfd: atmel-flexcom: add a fix and code cosmetics

[Claudiu Beznea]

The patches in this series:
1/2 - use __maybe_unused around PM code
2/2 - fixes the PM

Claudiu Beznea (2):
  mfd: atmel-flexcom: remove #ifdef CONFIG_PM_SLEEP
  mfd: atmel-flexcom: use resume_noirq

 drivers/mfd/atmel-flexcom.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

-- 
2.25.1

[PATCH 1/2] mfd: atmel-flexcom: remove #ifdef CONFIG_PM_SLEEP

[Claudiu Beznea]

Remove compilation flag and use __maybe_unused and pm_ptr instead.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/mfd/atmel-flexcom.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
index d2f5c073fdf3..962f66dc8813 100644
--- a/drivers/mfd/atmel-flexcom.c
+++ b/drivers/mfd/atmel-flexcom.c
@@ -87,8 +87,7 @@ static const struct of_device_id atmel_flexcom_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
 
-#ifdef CONFIG_PM_SLEEP
-static int atmel_flexcom_resume(struct device *dev)
+static int __maybe_unused atmel_flexcom_resume(struct device *dev)
 {
 	struct atmel_flexcom *ddata = dev_get_drvdata(dev);
 	int err;
@@ -105,7 +104,6 @@ static int atmel_flexcom_resume(struct device *dev)
 
 	return 0;
 }
-#endif
 
 static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL,
 			 atmel_flexcom_resume);
@@ -114,7 +112,7 @@ static struct platform_driver atmel_flexcom_driver = {
 	.probe	= atmel_flexcom_probe,
 	.driver	= {
 		.name		= "atmel_flexcom",
-		.pm		= &atmel_flexcom_pm_ops,
+		.pm		= pm_ptr(&atmel_flexcom_pm_ops),
 		.of_match_table	= atmel_flexcom_of_match,
 	},
 };
-- 
2.25.1

[PATCH 2/2] mfd: atmel-flexcom: use resume_noirq

[Claudiu Beznea]

Flexcom IP embeds 3 other IPs: usart, i2c, spi and selects the operation
mode (usart, i2c, spi) via mode register (FLEX_MR). On i2c bus there might
be connected critical devices (like PMIC) which on suspend/resume should
be suspended/resumed at the end/beginning. i2c uses
.suspend_noirq/.resume_noirq for this kind of purposes. Align flexcom
to use .resume_noirq as it should be resumed before the embedded IPs.
Otherwise the embedded devices might behave badly.

Fixes: 7fdec11015c3 ("atmel_flexcom: Support resuming after a chip reset")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/mfd/atmel-flexcom.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
index 962f66dc8813..559eb4d352b6 100644
--- a/drivers/mfd/atmel-flexcom.c
+++ b/drivers/mfd/atmel-flexcom.c
@@ -87,7 +87,7 @@ static const struct of_device_id atmel_flexcom_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
 
-static int __maybe_unused atmel_flexcom_resume(struct device *dev)
+static int __maybe_unused atmel_flexcom_resume_noirq(struct device *dev)
 {
 	struct atmel_flexcom *ddata = dev_get_drvdata(dev);
 	int err;
@@ -105,8 +105,9 @@ static int __maybe_unused atmel_flexcom_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL,
-			 atmel_flexcom_resume);
+static const struct dev_pm_ops atmel_flexcom_pm_ops = {
+	.resume_noirq = atmel_flexcom_resume_noirq,
+};
 
 static struct platform_driver atmel_flexcom_driver = {
 	.probe	= atmel_flexcom_probe,
-- 
2.25.1

Re: [PATCH 2/2] mfd: atmel-flexcom: use resume_noirq

[Codrin.Ciubotariu]

On 05.07.2021 14:31, Claudiu Beznea wrote:
> Flexcom IP embeds 3 other IPs: usart, i2c, spi and selects the operation
> mode (usart, i2c, spi) via mode register (FLEX_MR). On i2c bus there might
> be connected critical devices (like PMIC) which on suspend/resume should
> be suspended/resumed at the end/beginning. i2c uses
> .suspend_noirq/.resume_noirq for this kind of purposes. Align flexcom
> to use .resume_noirq as it should be resumed before the embedded IPs.
> Otherwise the embedded devices might behave badly.
> 
> Fixes: 7fdec11015c3 ("atmel_flexcom: Support resuming after a chip reset")
> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Tested-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>

Re: [PATCH 1/2] mfd: atmel-flexcom: remove #ifdef CONFIG_PM_SLEEP

[Nicolas Ferre]

On 05/07/2021 at 13:31, Claudiu Beznea wrote:
> Remove compilation flag and use __maybe_unused and pm_ptr instead.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>

> ---
>   drivers/mfd/atmel-flexcom.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
> index d2f5c073fdf3..962f66dc8813 100644
> --- a/drivers/mfd/atmel-flexcom.c
> +++ b/drivers/mfd/atmel-flexcom.c
> @@ -87,8 +87,7 @@ static const struct of_device_id atmel_flexcom_of_match[] = {
>   };
>   MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
>   
> -#ifdef CONFIG_PM_SLEEP
> -static int atmel_flexcom_resume(struct device *dev)
> +static int __maybe_unused atmel_flexcom_resume(struct device *dev)
>   {
>   	struct atmel_flexcom *ddata = dev_get_drvdata(dev);
>   	int err;
> @@ -105,7 +104,6 @@ static int atmel_flexcom_resume(struct device *dev)
>   
>   	return 0;
>   }
> -#endif
>   
>   static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL,
>   			 atmel_flexcom_resume);
> @@ -114,7 +112,7 @@ static struct platform_driver atmel_flexcom_driver = {
>   	.probe	= atmel_flexcom_probe,
>   	.driver	= {
>   		.name		= "atmel_flexcom",
> -		.pm		= &atmel_flexcom_pm_ops,
> +		.pm		= pm_ptr(&atmel_flexcom_pm_ops),
>   		.of_match_table	= atmel_flexcom_of_match,
>   	},
>   };
> 


-- 
Nicolas Ferre

Re: [PATCH 2/2] mfd: atmel-flexcom: use resume_noirq

[Nicolas Ferre]

On 05/07/2021 at 13:31, Claudiu Beznea wrote:
> Flexcom IP embeds 3 other IPs: usart, i2c, spi and selects the operation
> mode (usart, i2c, spi) via mode register (FLEX_MR). On i2c bus there might
> be connected critical devices (like PMIC) which on suspend/resume should
> be suspended/resumed at the end/beginning. i2c uses
> .suspend_noirq/.resume_noirq for this kind of purposes. Align flexcom
> to use .resume_noirq as it should be resumed before the embedded IPs.
> Otherwise the embedded devices might behave badly.
> 
> Fixes: 7fdec11015c3 ("atmel_flexcom: Support resuming after a chip reset")
> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>

Thanks Claudiu, best regards,
   Nicolas

> ---
>   drivers/mfd/atmel-flexcom.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mfd/atmel-flexcom.c b/drivers/mfd/atmel-flexcom.c
> index 962f66dc8813..559eb4d352b6 100644
> --- a/drivers/mfd/atmel-flexcom.c
> +++ b/drivers/mfd/atmel-flexcom.c
> @@ -87,7 +87,7 @@ static const struct of_device_id atmel_flexcom_of_match[] = {
>   };
>   MODULE_DEVICE_TABLE(of, atmel_flexcom_of_match);
>   
> -static int __maybe_unused atmel_flexcom_resume(struct device *dev)
> +static int __maybe_unused atmel_flexcom_resume_noirq(struct device *dev)
>   {
>   	struct atmel_flexcom *ddata = dev_get_drvdata(dev);
>   	int err;
> @@ -105,8 +105,9 @@ static int __maybe_unused atmel_flexcom_resume(struct device *dev)
>   	return 0;
>   }
>   
> -static SIMPLE_DEV_PM_OPS(atmel_flexcom_pm_ops, NULL,
> -			 atmel_flexcom_resume);
> +static const struct dev_pm_ops atmel_flexcom_pm_ops = {
> +	.resume_noirq = atmel_flexcom_resume_noirq,
> +};
>   
>   static struct platform_driver atmel_flexcom_driver = {
>   	.probe	= atmel_flexcom_probe,
> 


-- 
Nicolas Ferre