[PATCH] ARM: exynos_defconfig: Make S3C2410_WATCHDOG as loadable module

[PATCH] ARM: exynos_defconfig: Make S3C2410_WATCHDOG as loadable module

[Anand Moon]

S3C2410_WATCHDOG watchdog drivers should not be loaded automatically,
but only if a watchdog daemon is installed.

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
 arch/arm/configs/exynos_defconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
index aaf7aa4..b5d382e 100644
--- a/arch/arm/configs/exynos_defconfig
+++ b/arch/arm/configs/exynos_defconfig
@@ -101,7 +101,7 @@ CONFIG_CPU_THERMAL=y
 CONFIG_THERMAL_EMULATION=y
 CONFIG_EXYNOS_THERMAL=y
 CONFIG_WATCHDOG=y
-CONFIG_S3C2410_WATCHDOG=y
+CONFIG_S3C2410_WATCHDOG=m
 CONFIG_MFD_CROS_EC=y
 CONFIG_MFD_CROS_EC_I2C=y
 CONFIG_MFD_CROS_EC_SPI=y
-- 
2.1.4

[PATCH] ARM: exynos_defconfig: Make S3C2410_WATCHDOG as loadable module

[Krzysztof Kozlowski]

On 03.09.2015 13:10, Anand Moon wrote:
> S3C2410_WATCHDOG watchdog drivers should not be loaded automatically,
> but only if a watchdog daemon is installed.

First of all: why?

Secondly: even as a module driver could be loaded automatically to match
enabled device (it has MODULE_DEVICE_TABLE). In the same time loading it
does not hurt - watchdog should be inactive:

s3c2410-wdt 10060000.watchdog: watchdog inactive, reset disabled, irq
disabled

Best regards,
Krzysztof

> 
> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
> ---
>  arch/arm/configs/exynos_defconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
> index aaf7aa4..b5d382e 100644
> --- a/arch/arm/configs/exynos_defconfig
> +++ b/arch/arm/configs/exynos_defconfig
> @@ -101,7 +101,7 @@ CONFIG_CPU_THERMAL=y
>  CONFIG_THERMAL_EMULATION=y
>  CONFIG_EXYNOS_THERMAL=y
>  CONFIG_WATCHDOG=y
> -CONFIG_S3C2410_WATCHDOG=y
> +CONFIG_S3C2410_WATCHDOG=m
>  CONFIG_MFD_CROS_EC=y
>  CONFIG_MFD_CROS_EC_I2C=y
>  CONFIG_MFD_CROS_EC_SPI=y
> 

[PATCH] ARM: exynos_defconfig: Make S3C2410_WATCHDOG as loadable module

[Anand Moon]

Hi Krzysztof

On 3 September 2015 at 10:32, Krzysztof Kozlowski
<k.kozlowski@samsung.com> wrote:
> On 03.09.2015 13:10, Anand Moon wrote:
>> S3C2410_WATCHDOG watchdog drivers should not be loaded automatically,
>> but only if a watchdog daemon is installed.
>
> First of all: why?
>
> Secondly: even as a module driver could be loaded automatically to match
> enabled device (it has MODULE_DEVICE_TABLE). In the same time loading it
> does not hurt - watchdog should be inactive:
>
> s3c2410-wdt 10060000.watchdog: watchdog inactive, reset disabled, irq
> disabled
>
> Best regards,
> Krzysztof
>
>>
>> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
>> ---
>>  arch/arm/configs/exynos_defconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
>> index aaf7aa4..b5d382e 100644
>> --- a/arch/arm/configs/exynos_defconfig
>> +++ b/arch/arm/configs/exynos_defconfig
>> @@ -101,7 +101,7 @@ CONFIG_CPU_THERMAL=y
>>  CONFIG_THERMAL_EMULATION=y
>>  CONFIG_EXYNOS_THERMAL=y
>>  CONFIG_WATCHDOG=y
>> -CONFIG_S3C2410_WATCHDOG=y
>> +CONFIG_S3C2410_WATCHDOG=m
>>  CONFIG_MFD_CROS_EC=y
>>  CONFIG_MFD_CROS_EC_I2C=y
>>  CONFIG_MFD_CROS_EC_SPI=y
>>

All the watchdog drivers are blacklisted not to be loaded by the ubuntu.
Their are some configurable parameters which get configured while
loading of the module using watchdog daemon.
Watchdog service will reconfigure watchdog driver while loading.

-Anand Moon
>

[PATCH] ARM: exynos_defconfig: Make S3C2410_WATCHDOG as loadable module

[Krzysztof Kozlowski]

On 03.09.2015 14:20, Anand Moon wrote:
> Hi Krzysztof
> 
> On 3 September 2015 at 10:32, Krzysztof Kozlowski
> <k.kozlowski@samsung.com> wrote:
>> On 03.09.2015 13:10, Anand Moon wrote:
>>> S3C2410_WATCHDOG watchdog drivers should not be loaded automatically,
>>> but only if a watchdog daemon is installed.
>>
>> First of all: why?
>>
>> Secondly: even as a module driver could be loaded automatically to match
>> enabled device (it has MODULE_DEVICE_TABLE). In the same time loading it
>> does not hurt - watchdog should be inactive:
>>
>> s3c2410-wdt 10060000.watchdog: watchdog inactive, reset disabled, irq
>> disabled
>>
>> Best regards,
>> Krzysztof
>>
>>>
>>> Signed-off-by: Anand Moon <linux.amoon@gmail.com>
>>> ---
>>>  arch/arm/configs/exynos_defconfig | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm/configs/exynos_defconfig b/arch/arm/configs/exynos_defconfig
>>> index aaf7aa4..b5d382e 100644
>>> --- a/arch/arm/configs/exynos_defconfig
>>> +++ b/arch/arm/configs/exynos_defconfig
>>> @@ -101,7 +101,7 @@ CONFIG_CPU_THERMAL=y
>>>  CONFIG_THERMAL_EMULATION=y
>>>  CONFIG_EXYNOS_THERMAL=y
>>>  CONFIG_WATCHDOG=y
>>> -CONFIG_S3C2410_WATCHDOG=y
>>> +CONFIG_S3C2410_WATCHDOG=m
>>>  CONFIG_MFD_CROS_EC=y
>>>  CONFIG_MFD_CROS_EC_I2C=y
>>>  CONFIG_MFD_CROS_EC_SPI=y
>>>
> 
> All the watchdog drivers are blacklisted not to be loaded by the ubuntu.
> Their are some configurable parameters which get configured while
> loading of the module using watchdog daemon.
> Watchdog service will reconfigure watchdog driver while loading.

Thank you for clarification. First of all such information (that Ubuntu
requires it) should be put in commit message.

This looks like a requirement specific for Ubuntu. For example on Arch
these modules are not blacklisted. I don't know how this is handled on
Debian or Fedora.

Other defconfigs (including multi_v7) make these modules built-in.

Summarizing I am not convinced that the change is necessary. Having
everything built-in makes testing exynos defconfig easier because some
you just upload zImage and DTB to the testing board. With modules you
have to prepare the initramfs/initrd (e.g. for network boot).

Best regards,
Krzysztof