[RFC,v5,3/6] PM / devfreq: exynos-bus: Add registration of interconnect child device
diff mbox series

Message ID 20200529163200.18031-4-s.nawrocki@samsung.com
State Superseded
Headers show
Series
  • Exynos: Simple QoS for exynos-bus using interconnect
Related show

Commit Message

Sylwester Nawrocki May 29, 2020, 4:31 p.m. UTC
This patch adds registration of a child platform device for the exynos
interconnect driver. It is assumed that the interconnect provider will
only be needed when #interconnect-cells property is present in the bus
DT node, hence the child device will be created only when such a property
is present.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>

Changes for v5:
 - new patch.
---
 drivers/devfreq/exynos-bus.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Comments

Chanwoo Choi May 30, 2020, 11:57 p.m. UTC | #1
Hi Sylwester,

On Sat, May 30, 2020 at 1:33 AM Sylwester Nawrocki
<s.nawrocki@samsung.com> wrote:
>
> This patch adds registration of a child platform device for the exynos
> interconnect driver. It is assumed that the interconnect provider will
> only be needed when #interconnect-cells property is present in the bus
> DT node, hence the child device will be created only when such a property
> is present.
>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>
> Changes for v5:
>  - new patch.
> ---
>  drivers/devfreq/exynos-bus.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index 8fa8eb5..856e37d 100644
> --- a/drivers/devfreq/exynos-bus.c
> +++ b/drivers/devfreq/exynos-bus.c
> @@ -24,6 +24,7 @@
>
>  struct exynos_bus {
>         struct device *dev;
> +       struct platform_device *icc_pdev;
>
>         struct devfreq *devfreq;
>         struct devfreq_event_dev **edev;
> @@ -156,6 +157,8 @@ static void exynos_bus_exit(struct device *dev)
>         if (ret < 0)
>                 dev_warn(dev, "failed to disable the devfreq-event devices\n");
>
> +       platform_device_unregister(bus->icc_pdev);
> +
>         dev_pm_opp_of_remove_table(dev);
>         clk_disable_unprepare(bus->clk);
>         if (bus->opp_table) {
> @@ -168,6 +171,8 @@ static void exynos_bus_passive_exit(struct device *dev)
>  {
>         struct exynos_bus *bus = dev_get_drvdata(dev);
>
> +       platform_device_unregister(bus->icc_pdev);
> +
>         dev_pm_opp_of_remove_table(dev);
>         clk_disable_unprepare(bus->clk);
>  }
> @@ -431,6 +436,18 @@ static int exynos_bus_probe(struct platform_device *pdev)
>         if (ret < 0)
>                 goto err;
>
> +       /* Create child platform device for the interconnect provider */
> +       if (of_get_property(dev->of_node, "#interconnect-cells", NULL)) {
> +                   bus->icc_pdev = platform_device_register_data(
> +                                               dev, "exynos-generic-icc",
> +                                               PLATFORM_DEVID_AUTO, NULL, 0);
> +
> +                   if (IS_ERR(bus->icc_pdev)) {
> +                           ret = PTR_ERR(bus->icc_pdev);
> +                           goto err;
> +                   }
> +       }
> +
>         max_state = bus->devfreq->profile->max_state;
>         min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
>         max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
> --
> 2.7.4
>

It looks like very similar like the registering the interconnect
device of imx-bus.c
and I already reviewed and agreed this approach.

Acked-by: Chanwoo Choi <cw00.choi@samsung.com>

nitpick: IMHO, I think that 'exynos-icc' is proper and simple without
'generic' word.
If we need to add new icc compatible int the future, we will add
'exynosXXXX-icc' new compatible.
But, I'm not forcing it. just opinion. Anyway, I agree this approach.
Sylwester Nawrocki June 1, 2020, 10:04 a.m. UTC | #2
Cc: Rob, devicetree ML

On 31.05.2020 01:57, Chanwoo Choi wrote:
> On Sat, May 30, 2020 at 1:33 AM Sylwester Nawrocki
> <s.nawrocki@samsung.com> wrote:
>>
>> This patch adds registration of a child platform device for the exynos
>> interconnect driver. It is assumed that the interconnect provider will
>> only be needed when #interconnect-cells property is present in the bus
>> DT node, hence the child device will be created only when such a property
>> is present.
>>
>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>
>> Changes for v5:
>>  - new patch.
>> ---
>>  drivers/devfreq/exynos-bus.c | 17 +++++++++++++++++
>>  1 file changed, 17 insertions(+)
>>
>> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
>> index 8fa8eb5..856e37d 100644
>> --- a/drivers/devfreq/exynos-bus.c
>> +++ b/drivers/devfreq/exynos-bus.c
>> @@ -24,6 +24,7 @@
>>
>>  struct exynos_bus {
>>         struct device *dev;
>> +       struct platform_device *icc_pdev;
>>
>>         struct devfreq *devfreq;
>>         struct devfreq_event_dev **edev;
>> @@ -156,6 +157,8 @@ static void exynos_bus_exit(struct device *dev)
>>         if (ret < 0)
>>                 dev_warn(dev, "failed to disable the devfreq-event devices\n");
>>
>> +       platform_device_unregister(bus->icc_pdev);
>> +
>>         dev_pm_opp_of_remove_table(dev);
>>         clk_disable_unprepare(bus->clk);
>>         if (bus->opp_table) {
>> @@ -168,6 +171,8 @@ static void exynos_bus_passive_exit(struct device *dev)
>>  {
>>         struct exynos_bus *bus = dev_get_drvdata(dev);
>>
>> +       platform_device_unregister(bus->icc_pdev);
>> +
>>         dev_pm_opp_of_remove_table(dev);
>>         clk_disable_unprepare(bus->clk);
>>  }
>> @@ -431,6 +436,18 @@ static int exynos_bus_probe(struct platform_device *pdev)
>>         if (ret < 0)
>>                 goto err;
>>
>> +       /* Create child platform device for the interconnect provider */
>> +       if (of_get_property(dev->of_node, "#interconnect-cells", NULL)) {
>> +                   bus->icc_pdev = platform_device_register_data(
>> +                                               dev, "exynos-generic-icc",
>> +                                               PLATFORM_DEVID_AUTO, NULL, 0);
>> +
>> +                   if (IS_ERR(bus->icc_pdev)) {
>> +                           ret = PTR_ERR(bus->icc_pdev);
>> +                           goto err;
>> +                   }
>> +       }
>> +
>>         max_state = bus->devfreq->profile->max_state;
>>         min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
>>         max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
>> --
>> 2.7.4
>>
> 
> It looks like very similar like the registering the interconnect
> device of imx-bus.c
> and I already reviewed and agreed this approach.
> 
> Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
> 
> nitpick: IMHO, I think that 'exynos-icc' is proper and simple without
> 'generic' word.
> If we need to add new icc compatible int the future, we will add
> 'exynosXXXX-icc' new compatible.
> But, I'm not forcing it. just opinion. Anyway, I agree this approach.

Thanks for review. I will change the name to exynos-icc in next version, 
as I commented at other patch, it is not part of any DT binding, 
it is just for device/driver matching between devfreq and interconnect.


--
Thanks, 
Sylwester
Chanwoo Choi June 2, 2020, 12:50 a.m. UTC | #3
Hi Sylwester,

On 6/1/20 7:04 PM, Sylwester Nawrocki wrote:
> Cc: Rob, devicetree ML
> 
> On 31.05.2020 01:57, Chanwoo Choi wrote:
>> On Sat, May 30, 2020 at 1:33 AM Sylwester Nawrocki
>> <s.nawrocki@samsung.com> wrote:
>>>
>>> This patch adds registration of a child platform device for the exynos
>>> interconnect driver. It is assumed that the interconnect provider will
>>> only be needed when #interconnect-cells property is present in the bus
>>> DT node, hence the child device will be created only when such a property
>>> is present.
>>>
>>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
>>>
>>> Changes for v5:
>>>  - new patch.
>>> ---
>>>  drivers/devfreq/exynos-bus.c | 17 +++++++++++++++++
>>>  1 file changed, 17 insertions(+)
>>>
>>> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
>>> index 8fa8eb5..856e37d 100644
>>> --- a/drivers/devfreq/exynos-bus.c
>>> +++ b/drivers/devfreq/exynos-bus.c
>>> @@ -24,6 +24,7 @@
>>>
>>>  struct exynos_bus {
>>>         struct device *dev;
>>> +       struct platform_device *icc_pdev;
>>>
>>>         struct devfreq *devfreq;
>>>         struct devfreq_event_dev **edev;
>>> @@ -156,6 +157,8 @@ static void exynos_bus_exit(struct device *dev)
>>>         if (ret < 0)
>>>                 dev_warn(dev, "failed to disable the devfreq-event devices\n");
>>>
>>> +       platform_device_unregister(bus->icc_pdev);
>>> +
>>>         dev_pm_opp_of_remove_table(dev);
>>>         clk_disable_unprepare(bus->clk);
>>>         if (bus->opp_table) {
>>> @@ -168,6 +171,8 @@ static void exynos_bus_passive_exit(struct device *dev)
>>>  {
>>>         struct exynos_bus *bus = dev_get_drvdata(dev);
>>>
>>> +       platform_device_unregister(bus->icc_pdev);
>>> +
>>>         dev_pm_opp_of_remove_table(dev);
>>>         clk_disable_unprepare(bus->clk);
>>>  }
>>> @@ -431,6 +436,18 @@ static int exynos_bus_probe(struct platform_device *pdev)
>>>         if (ret < 0)
>>>                 goto err;
>>>
>>> +       /* Create child platform device for the interconnect provider */
>>> +       if (of_get_property(dev->of_node, "#interconnect-cells", NULL)) {
>>> +                   bus->icc_pdev = platform_device_register_data(
>>> +                                               dev, "exynos-generic-icc",
>>> +                                               PLATFORM_DEVID_AUTO, NULL, 0);
>>> +
>>> +                   if (IS_ERR(bus->icc_pdev)) {
>>> +                           ret = PTR_ERR(bus->icc_pdev);
>>> +                           goto err;
>>> +                   }
>>> +       }
>>> +
>>>         max_state = bus->devfreq->profile->max_state;
>>>         min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
>>>         max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);
>>> --
>>> 2.7.4
>>>
>>
>> It looks like very similar like the registering the interconnect
>> device of imx-bus.c
>> and I already reviewed and agreed this approach.
>>
>> Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
>>
>> nitpick: IMHO, I think that 'exynos-icc' is proper and simple without
>> 'generic' word.
>> If we need to add new icc compatible int the future, we will add
>> 'exynosXXXX-icc' new compatible.
>> But, I'm not forcing it. just opinion. Anyway, I agree this approach.
> 
> Thanks for review. I will change the name to exynos-icc in next version, 
> as I commented at other patch, it is not part of any DT binding, 
> it is just for device/driver matching between devfreq and interconnect.

Thanks. I have not any objection to use either 'exynos-generic-icc' 
or 'exynos-icc'. It is just my opinion. And on next version,
please add linux-pm mailing list to Cc.

Patch
diff mbox series

diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
index 8fa8eb5..856e37d 100644
--- a/drivers/devfreq/exynos-bus.c
+++ b/drivers/devfreq/exynos-bus.c
@@ -24,6 +24,7 @@ 
 
 struct exynos_bus {
 	struct device *dev;
+	struct platform_device *icc_pdev;
 
 	struct devfreq *devfreq;
 	struct devfreq_event_dev **edev;
@@ -156,6 +157,8 @@  static void exynos_bus_exit(struct device *dev)
 	if (ret < 0)
 		dev_warn(dev, "failed to disable the devfreq-event devices\n");
 
+	platform_device_unregister(bus->icc_pdev);
+
 	dev_pm_opp_of_remove_table(dev);
 	clk_disable_unprepare(bus->clk);
 	if (bus->opp_table) {
@@ -168,6 +171,8 @@  static void exynos_bus_passive_exit(struct device *dev)
 {
 	struct exynos_bus *bus = dev_get_drvdata(dev);
 
+	platform_device_unregister(bus->icc_pdev);
+
 	dev_pm_opp_of_remove_table(dev);
 	clk_disable_unprepare(bus->clk);
 }
@@ -431,6 +436,18 @@  static int exynos_bus_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto err;
 
+	/* Create child platform device for the interconnect provider */
+	if (of_get_property(dev->of_node, "#interconnect-cells", NULL)) {
+		    bus->icc_pdev = platform_device_register_data(
+						dev, "exynos-generic-icc",
+						PLATFORM_DEVID_AUTO, NULL, 0);
+
+		    if (IS_ERR(bus->icc_pdev)) {
+			    ret = PTR_ERR(bus->icc_pdev);
+			    goto err;
+		    }
+	}
+
 	max_state = bus->devfreq->profile->max_state;
 	min_freq = (bus->devfreq->profile->freq_table[0] / 1000);
 	max_freq = (bus->devfreq->profile->freq_table[max_state - 1] / 1000);