serial: samsung: Fix serial config dependencies for exynos7

Commit Message

Abhilash Kesavan Sept. 29, 2014, 5:16 a.m. UTC

From: Pankaj Dubey <[e-mail]>

Exynos7 has a similar serial controller to that present in older Samsung
SoCs. To re-use the existing serial driver on Exynos7 we need to have
SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS selected. This is not
possible because these symbols are dependent on PLAT_SAMSUNG which is
not present for the ARMv8 based exynos7.

Change the dependency of these symbols from PLAT_SAMSUNG to the serial
driver thus making it available on exynos7. As the existing platform
specific code making use of these symbols is related to uart driver this
change in dependency should not cause any issues.

Signed-off-by: Pankaj Dubey <[e-mail]>
Signed-off-by: Naveen Krishna Chatradhi <[e-mail]>
Signed-off-by: Abhilash Kesavan <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
---
Build tested with s3c6400_defconfig, exynos_defconfig and arm64's defconfig
with and without the serial driver enabled.

 drivers/tty/serial/Kconfig |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Tomasz Figa Sept. 29, 2014, 10:38 p.m. UTC | #1

Hi Abhilash,

The patch itself seems fine, but I wonder if those config options aren't
really just leftovers from the past and couldn't be completely removed.

On 29.09.2014 07:16, Abhilash Kesavan wrote:
> From: Pankaj Dubey <[e-mail]>
> 
> Exynos7 has a similar serial controller to that present in older Samsung
> SoCs. To re-use the existing serial driver on Exynos7 we need to have
> SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS selected. This is not
> possible because these symbols are dependent on PLAT_SAMSUNG which is
> not present for the ARMv8 based exynos7.
> 
> Change the dependency of these symbols from PLAT_SAMSUNG to the serial
> driver thus making it available on exynos7. As the existing platform
> specific code making use of these symbols is related to uart driver this
> change in dependency should not cause any issues.
> 
> Signed-off-by: Pankaj Dubey <[e-mail]>
> Signed-off-by: Naveen Krishna Chatradhi <[e-mail]>
> Signed-off-by: Abhilash Kesavan <[e-mail]>
> Cc: Greg Kroah-Hartman <[e-mail]>
> ---
> Build tested with s3c6400_defconfig, exynos_defconfig and arm64's defconfig
> with and without the serial driver enabled.
> 
>  drivers/tty/serial/Kconfig |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index 81f6ee7..e6c0bcb 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -249,14 +249,14 @@ config SERIAL_SAMSUNG
>  
>  config SERIAL_SAMSUNG_UARTS_4
>  	bool
> -	depends on PLAT_SAMSUNG
> +	depends on SERIAL_SAMSUNG
>  	default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
>  	help
>  	  Internal node for the common case of 4 Samsung compatible UARTs

The only place where this symbol is used is below.

>  
>  config SERIAL_SAMSUNG_UARTS
>  	int
> -	depends on PLAT_SAMSUNG
> +	depends on SERIAL_SAMSUNG
>  	default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
>  	default 3
>  	help
> 

With this symbol the situation isn't that easy, but still should be
manageable.

Looking at the serial-samsung driver, all occurrences of
CONFIG_SERIAL_SAMSUNG_UARTS could be simply replaced with a locally
defined number equal to the maximum value - in this case 4.

There are also two places in arch/arm where this symbol is used:

1) In arch/arm/mach-s3c64xx/irq-pm.c it's used as the number of serial
ports which need suspend/resume handling. Since on s3c64xx the number is
always 4, it can be simply defined locally as a constant.

2) In arch/arm/plat-samsung/init.c it is used to determine size of a
static array of UART ports and to check whether the UART driver is
enabled. In former case I believe it should be safe to hardcode it to 4
as well, in latter CONFIG_SERIAL_SAMSUNG can be used.

Best regards,
Tomasz
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Abhilash Kesavan Sept. 30, 2014, 2:32 p.m. UTC | #2

Hi Tomasz,

On Tue, Sep 30, 2014 at 4:08 AM, Tomasz Figa <[e-mail]> wrote:
> Hi Abhilash,
>
> The patch itself seems fine, but I wonder if those config options aren't
> really just leftovers from the past and couldn't be completely removed.
>
> On 29.09.2014 07:16, Abhilash Kesavan wrote:
>> From: Pankaj Dubey <[e-mail]>
>>
>> Exynos7 has a similar serial controller to that present in older Samsung
>> SoCs. To re-use the existing serial driver on Exynos7 we need to have
>> SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS selected. This is not
>> possible because these symbols are dependent on PLAT_SAMSUNG which is
>> not present for the ARMv8 based exynos7.
>>
>> Change the dependency of these symbols from PLAT_SAMSUNG to the serial
>> driver thus making it available on exynos7. As the existing platform
>> specific code making use of these symbols is related to uart driver this
>> change in dependency should not cause any issues.
>>
>> Signed-off-by: Pankaj Dubey <[e-mail]>
>> Signed-off-by: Naveen Krishna Chatradhi <[e-mail]>
>> Signed-off-by: Abhilash Kesavan <[e-mail]>
>> Cc: Greg Kroah-Hartman <[e-mail]>
>> ---
>> Build tested with s3c6400_defconfig, exynos_defconfig and arm64's defconfig
>> with and without the serial driver enabled.
>>
>>  drivers/tty/serial/Kconfig |    4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>> index 81f6ee7..e6c0bcb 100644
>> --- a/drivers/tty/serial/Kconfig
>> +++ b/drivers/tty/serial/Kconfig
>> @@ -249,14 +249,14 @@ config SERIAL_SAMSUNG
>>
>>  config SERIAL_SAMSUNG_UARTS_4
>>       bool
>> -     depends on PLAT_SAMSUNG
>> +     depends on SERIAL_SAMSUNG
>>       default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
>>       help
>>         Internal node for the common case of 4 Samsung compatible UARTs
>
> The only place where this symbol is used is below.
>
>>
>>  config SERIAL_SAMSUNG_UARTS
>>       int
>> -     depends on PLAT_SAMSUNG
>> +     depends on SERIAL_SAMSUNG
>>       default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
>>       default 3
>>       help
>>
>
> With this symbol the situation isn't that easy, but still should be
> manageable.
>
> Looking at the serial-samsung driver, all occurrences of
> CONFIG_SERIAL_SAMSUNG_UARTS could be simply replaced with a locally
> defined number equal to the maximum value - in this case 4.
>
> There are also two places in arch/arm where this symbol is used:
>
> 1) In arch/arm/mach-s3c64xx/irq-pm.c it's used as the number of serial
> ports which need suspend/resume handling. Since on s3c64xx the number is
> always 4, it can be simply defined locally as a constant.
>
> 2) In arch/arm/plat-samsung/init.c it is used to determine size of a
> static array of UART ports and to check whether the UART driver is
> enabled. In former case I believe it should be safe to hardcode it to 4
> as well, in latter CONFIG_SERIAL_SAMSUNG can be used.

I will post patches removing these two symbols.

Regards,
Abhilash
>
> Best regards,
> Tomasz
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Abhilash Kesavan Nov. 11, 2014, 2:25 p.m. UTC | #3

Hi Greg,

On Tue, Sep 30, 2014 at 8:02 PM, Abhilash Kesavan
<[e-mail]> wrote:
> Hi Tomasz,
>
> On Tue, Sep 30, 2014 at 4:08 AM, Tomasz Figa <[e-mail]> wrote:
>> Hi Abhilash,
>>
>> The patch itself seems fine, but I wonder if those config options aren't
>> really just leftovers from the past and couldn't be completely removed.
>>
>> On 29.09.2014 07:16, Abhilash Kesavan wrote:
>>> From: Pankaj Dubey <[e-mail]>
>>>
>>> Exynos7 has a similar serial controller to that present in older Samsung
>>> SoCs. To re-use the existing serial driver on Exynos7 we need to have
>>> SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS selected. This is not
>>> possible because these symbols are dependent on PLAT_SAMSUNG which is
>>> not present for the ARMv8 based exynos7.
>>>
>>> Change the dependency of these symbols from PLAT_SAMSUNG to the serial
>>> driver thus making it available on exynos7. As the existing platform
>>> specific code making use of these symbols is related to uart driver this
>>> change in dependency should not cause any issues.
>>>
>>> Signed-off-by: Pankaj Dubey <[e-mail]>
>>> Signed-off-by: Naveen Krishna Chatradhi <[e-mail]>
>>> Signed-off-by: Abhilash Kesavan <[e-mail]>
>>> Cc: Greg Kroah-Hartman <[e-mail]>
>>> ---
>>> Build tested with s3c6400_defconfig, exynos_defconfig and arm64's defconfig
>>> with and without the serial driver enabled.
>>>
>>>  drivers/tty/serial/Kconfig |    4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>>> index 81f6ee7..e6c0bcb 100644
>>> --- a/drivers/tty/serial/Kconfig
>>> +++ b/drivers/tty/serial/Kconfig
>>> @@ -249,14 +249,14 @@ config SERIAL_SAMSUNG
>>>
>>>  config SERIAL_SAMSUNG_UARTS_4
>>>       bool
>>> -     depends on PLAT_SAMSUNG
>>> +     depends on SERIAL_SAMSUNG
>>>       default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
>>>       help
>>>         Internal node for the common case of 4 Samsung compatible UARTs
>>
>> The only place where this symbol is used is below.
>>
>>>
>>>  config SERIAL_SAMSUNG_UARTS
>>>       int
>>> -     depends on PLAT_SAMSUNG
>>> +     depends on SERIAL_SAMSUNG
>>>       default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
>>>       default 3
>>>       help
>>>
>>
>> With this symbol the situation isn't that easy, but still should be
>> manageable.
>>
>> Looking at the serial-samsung driver, all occurrences of
>> CONFIG_SERIAL_SAMSUNG_UARTS could be simply replaced with a locally
>> defined number equal to the maximum value - in this case 4.
>>
>> There are also two places in arch/arm where this symbol is used:
>>
>> 1) In arch/arm/mach-s3c64xx/irq-pm.c it's used as the number of serial
>> ports which need suspend/resume handling. Since on s3c64xx the number is
>> always 4, it can be simply defined locally as a constant.
>>
>> 2) In arch/arm/plat-samsung/init.c it is used to determine size of a
>> static array of UART ports and to check whether the UART driver is
>> enabled. In former case I believe it should be safe to hardcode it to 4
>> as well, in latter CONFIG_SERIAL_SAMSUNG can be used.
>
> I will post patches removing these two symbols.

I posted a couple of patches handling Tomasz' comments but Kukjin
prefers the approach in this patch (Discussion here:
http://www.spinics.net/lists/linux-samsung-soc/msg38742.html).
Can you please review the patch.

Regards,
Abhilash
>
> Regards,
> Abhilash
>>
>> Best regards,
>> Tomasz
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> the body of a message to [e-mail]
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>> Please read the FAQ at  http://www.tux.org/lkml/
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Abhilash Kesavan Nov. 16, 2014, 2:17 a.m. UTC | #4

Hello Greg,

On Tue, Nov 11, 2014 at 7:55 PM, Abhilash Kesavan
<[e-mail]> wrote:
> Hi Greg,
>
> On Tue, Sep 30, 2014 at 8:02 PM, Abhilash Kesavan
> <[e-mail]> wrote:
>> Hi Tomasz,
>>
>> On Tue, Sep 30, 2014 at 4:08 AM, Tomasz Figa <[e-mail]> wrote:
>>> Hi Abhilash,
>>>
>>> The patch itself seems fine, but I wonder if those config options aren't
>>> really just leftovers from the past and couldn't be completely removed.
>>>
>>> On 29.09.2014 07:16, Abhilash Kesavan wrote:
>>>> From: Pankaj Dubey <[e-mail]>
>>>>
>>>> Exynos7 has a similar serial controller to that present in older Samsung
>>>> SoCs. To re-use the existing serial driver on Exynos7 we need to have
>>>> SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS selected. This is not
>>>> possible because these symbols are dependent on PLAT_SAMSUNG which is
>>>> not present for the ARMv8 based exynos7.
>>>>
>>>> Change the dependency of these symbols from PLAT_SAMSUNG to the serial
>>>> driver thus making it available on exynos7. As the existing platform
>>>> specific code making use of these symbols is related to uart driver this
>>>> change in dependency should not cause any issues.
>>>>
>>>> Signed-off-by: Pankaj Dubey <[e-mail]>
>>>> Signed-off-by: Naveen Krishna Chatradhi <[e-mail]>
>>>> Signed-off-by: Abhilash Kesavan <[e-mail]>
>>>> Cc: Greg Kroah-Hartman <[e-mail]>
>>>> ---
>>>> Build tested with s3c6400_defconfig, exynos_defconfig and arm64's defconfig
>>>> with and without the serial driver enabled.
>>>>
>>>>  drivers/tty/serial/Kconfig |    4 ++--
>>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>>>> index 81f6ee7..e6c0bcb 100644
>>>> --- a/drivers/tty/serial/Kconfig
>>>> +++ b/drivers/tty/serial/Kconfig
>>>> @@ -249,14 +249,14 @@ config SERIAL_SAMSUNG
>>>>
>>>>  config SERIAL_SAMSUNG_UARTS_4
>>>>       bool
>>>> -     depends on PLAT_SAMSUNG
>>>> +     depends on SERIAL_SAMSUNG
>>>>       default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
>>>>       help
>>>>         Internal node for the common case of 4 Samsung compatible UARTs
>>>
>>> The only place where this symbol is used is below.
>>>
>>>>
>>>>  config SERIAL_SAMSUNG_UARTS
>>>>       int
>>>> -     depends on PLAT_SAMSUNG
>>>> +     depends on SERIAL_SAMSUNG
>>>>       default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
>>>>       default 3
>>>>       help
>>>>
>>>
>>> With this symbol the situation isn't that easy, but still should be
>>> manageable.
>>>
>>> Looking at the serial-samsung driver, all occurrences of
>>> CONFIG_SERIAL_SAMSUNG_UARTS could be simply replaced with a locally
>>> defined number equal to the maximum value - in this case 4.
>>>
>>> There are also two places in arch/arm where this symbol is used:
>>>
>>> 1) In arch/arm/mach-s3c64xx/irq-pm.c it's used as the number of serial
>>> ports which need suspend/resume handling. Since on s3c64xx the number is
>>> always 4, it can be simply defined locally as a constant.
>>>
>>> 2) In arch/arm/plat-samsung/init.c it is used to determine size of a
>>> static array of UART ports and to check whether the UART driver is
>>> enabled. In former case I believe it should be safe to hardcode it to 4
>>> as well, in latter CONFIG_SERIAL_SAMSUNG can be used.
>>
>> I will post patches removing these two symbols.
>
> I posted a couple of patches handling Tomasz' comments but Kukjin
> prefers the approach in this patch (Discussion here:
> http://www.spinics.net/lists/linux-samsung-soc/msg38742.html).
> Can you please review the patch.

This is a gentle reminder. The patch is required for serial enablement
on the new exynos7 SoC, kindly take a look.

Thanks,
Abhilash
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Greg Kroah-Hartman Nov. 16, 2014, 9:10 p.m. UTC | #5

On Sun, Nov 16, 2014 at 07:47:02AM +0530, Abhilash Kesavan wrote:
> Hello Greg,
> 
> On Tue, Nov 11, 2014 at 7:55 PM, Abhilash Kesavan
> <[e-mail]> wrote:
> > Hi Greg,
> >
> > On Tue, Sep 30, 2014 at 8:02 PM, Abhilash Kesavan
> > <[e-mail]> wrote:
> >> Hi Tomasz,
> >>
> >> On Tue, Sep 30, 2014 at 4:08 AM, Tomasz Figa <[e-mail]> wrote:
> >>> Hi Abhilash,
> >>>
> >>> The patch itself seems fine, but I wonder if those config options aren't
> >>> really just leftovers from the past and couldn't be completely removed.
> >>>
> >>> On 29.09.2014 07:16, Abhilash Kesavan wrote:
> >>>> From: Pankaj Dubey <[e-mail]>
> >>>>
> >>>> Exynos7 has a similar serial controller to that present in older Samsung
> >>>> SoCs. To re-use the existing serial driver on Exynos7 we need to have
> >>>> SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS selected. This is not
> >>>> possible because these symbols are dependent on PLAT_SAMSUNG which is
> >>>> not present for the ARMv8 based exynos7.
> >>>>
> >>>> Change the dependency of these symbols from PLAT_SAMSUNG to the serial
> >>>> driver thus making it available on exynos7. As the existing platform
> >>>> specific code making use of these symbols is related to uart driver this
> >>>> change in dependency should not cause any issues.
> >>>>
> >>>> Signed-off-by: Pankaj Dubey <[e-mail]>
> >>>> Signed-off-by: Naveen Krishna Chatradhi <[e-mail]>
> >>>> Signed-off-by: Abhilash Kesavan <[e-mail]>
> >>>> Cc: Greg Kroah-Hartman <[e-mail]>
> >>>> ---
> >>>> Build tested with s3c6400_defconfig, exynos_defconfig and arm64's defconfig
> >>>> with and without the serial driver enabled.
> >>>>
> >>>>  drivers/tty/serial/Kconfig |    4 ++--
> >>>>  1 file changed, 2 insertions(+), 2 deletions(-)
> >>>>
> >>>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> >>>> index 81f6ee7..e6c0bcb 100644
> >>>> --- a/drivers/tty/serial/Kconfig
> >>>> +++ b/drivers/tty/serial/Kconfig
> >>>> @@ -249,14 +249,14 @@ config SERIAL_SAMSUNG
> >>>>
> >>>>  config SERIAL_SAMSUNG_UARTS_4
> >>>>       bool
> >>>> -     depends on PLAT_SAMSUNG
> >>>> +     depends on SERIAL_SAMSUNG
> >>>>       default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
> >>>>       help
> >>>>         Internal node for the common case of 4 Samsung compatible UARTs
> >>>
> >>> The only place where this symbol is used is below.
> >>>
> >>>>
> >>>>  config SERIAL_SAMSUNG_UARTS
> >>>>       int
> >>>> -     depends on PLAT_SAMSUNG
> >>>> +     depends on SERIAL_SAMSUNG
> >>>>       default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
> >>>>       default 3
> >>>>       help
> >>>>
> >>>
> >>> With this symbol the situation isn't that easy, but still should be
> >>> manageable.
> >>>
> >>> Looking at the serial-samsung driver, all occurrences of
> >>> CONFIG_SERIAL_SAMSUNG_UARTS could be simply replaced with a locally
> >>> defined number equal to the maximum value - in this case 4.
> >>>
> >>> There are also two places in arch/arm where this symbol is used:
> >>>
> >>> 1) In arch/arm/mach-s3c64xx/irq-pm.c it's used as the number of serial
> >>> ports which need suspend/resume handling. Since on s3c64xx the number is
> >>> always 4, it can be simply defined locally as a constant.
> >>>
> >>> 2) In arch/arm/plat-samsung/init.c it is used to determine size of a
> >>> static array of UART ports and to check whether the UART driver is
> >>> enabled. In former case I believe it should be safe to hardcode it to 4
> >>> as well, in latter CONFIG_SERIAL_SAMSUNG can be used.
> >>
> >> I will post patches removing these two symbols.
> >
> > I posted a couple of patches handling Tomasz' comments but Kukjin
> > prefers the approach in this patch (Discussion here:
> > http://www.spinics.net/lists/linux-samsung-soc/msg38742.html).
> > Can you please review the patch.
> 
> This is a gentle reminder. The patch is required for serial enablement
> on the new exynos7 SoC, kindly take a look.

What patch?  I fail to see anything in my inboxes that I can apply, only
this long thread that makes no sense at all.

Please resend anything that you want to have applied, in a format that I
can apply it, _AND_ get everyone to agree that it is the correct
solution.

Asking me to go look up random web archives, of mailing list threads I
was never copied on, is a sure way to get your email ignored, as again,
there is nothing I can do with it.  You know better than this.

greg k-h
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Abhilash Kesavan Nov. 17, 2014, 4:44 a.m. UTC | #6

Hello Greg,

On Mon, Nov 17, 2014 at 2:40 AM, [e-mail]
<[e-mail]> wrote:
> On Sun, Nov 16, 2014 at 07:47:02AM +0530, Abhilash Kesavan wrote:
>> Hello Greg,
>>
>> On Tue, Nov 11, 2014 at 7:55 PM, Abhilash Kesavan
>> <[e-mail]> wrote:
>> > Hi Greg,
>> >
>> > On Tue, Sep 30, 2014 at 8:02 PM, Abhilash Kesavan
>> > <[e-mail]> wrote:
>> >> Hi Tomasz,
>> >>
>> >> On Tue, Sep 30, 2014 at 4:08 AM, Tomasz Figa <[e-mail]> wrote:
>> >>> Hi Abhilash,
>> >>>
>> >>> The patch itself seems fine, but I wonder if those config options aren't
>> >>> really just leftovers from the past and couldn't be completely removed.
>> >>>
>> >>> On 29.09.2014 07:16, Abhilash Kesavan wrote:
>> >>>> From: Pankaj Dubey <[e-mail]>
>> >>>>
>> >>>> Exynos7 has a similar serial controller to that present in older Samsung
>> >>>> SoCs. To re-use the existing serial driver on Exynos7 we need to have
>> >>>> SERIAL_SAMSUNG_UARTS_4 and SERIAL_SAMSUNG_UARTS selected. This is not
>> >>>> possible because these symbols are dependent on PLAT_SAMSUNG which is
>> >>>> not present for the ARMv8 based exynos7.
>> >>>>
>> >>>> Change the dependency of these symbols from PLAT_SAMSUNG to the serial
>> >>>> driver thus making it available on exynos7. As the existing platform
>> >>>> specific code making use of these symbols is related to uart driver this
>> >>>> change in dependency should not cause any issues.
>> >>>>
>> >>>> Signed-off-by: Pankaj Dubey <[e-mail]>
>> >>>> Signed-off-by: Naveen Krishna Chatradhi <[e-mail]>
>> >>>> Signed-off-by: Abhilash Kesavan <[e-mail]>
>> >>>> Cc: Greg Kroah-Hartman <[e-mail]>
>> >>>> ---
>> >>>> Build tested with s3c6400_defconfig, exynos_defconfig and arm64's defconfig
>> >>>> with and without the serial driver enabled.
>> >>>>
>> >>>>  drivers/tty/serial/Kconfig |    4 ++--
>> >>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>> >>>>
>> >>>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>> >>>> index 81f6ee7..e6c0bcb 100644
>> >>>> --- a/drivers/tty/serial/Kconfig
>> >>>> +++ b/drivers/tty/serial/Kconfig
>> >>>> @@ -249,14 +249,14 @@ config SERIAL_SAMSUNG
>> >>>>
>> >>>>  config SERIAL_SAMSUNG_UARTS_4
>> >>>>       bool
>> >>>> -     depends on PLAT_SAMSUNG
>> >>>> +     depends on SERIAL_SAMSUNG
>> >>>>       default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
>> >>>>       help
>> >>>>         Internal node for the common case of 4 Samsung compatible UARTs
>> >>>
>> >>> The only place where this symbol is used is below.
>> >>>
>> >>>>
>> >>>>  config SERIAL_SAMSUNG_UARTS
>> >>>>       int
>> >>>> -     depends on PLAT_SAMSUNG
>> >>>> +     depends on SERIAL_SAMSUNG
>> >>>>       default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
>> >>>>       default 3
>> >>>>       help
>> >>>>
>> >>>
>> >>> With this symbol the situation isn't that easy, but still should be
>> >>> manageable.
>> >>>
>> >>> Looking at the serial-samsung driver, all occurrences of
>> >>> CONFIG_SERIAL_SAMSUNG_UARTS could be simply replaced with a locally
>> >>> defined number equal to the maximum value - in this case 4.
>> >>>
>> >>> There are also two places in arch/arm where this symbol is used:
>> >>>
>> >>> 1) In arch/arm/mach-s3c64xx/irq-pm.c it's used as the number of serial
>> >>> ports which need suspend/resume handling. Since on s3c64xx the number is
>> >>> always 4, it can be simply defined locally as a constant.
>> >>>
>> >>> 2) In arch/arm/plat-samsung/init.c it is used to determine size of a
>> >>> static array of UART ports and to check whether the UART driver is
>> >>> enabled. In former case I believe it should be safe to hardcode it to 4
>> >>> as well, in latter CONFIG_SERIAL_SAMSUNG can be used.
>> >>
>> >> I will post patches removing these two symbols.
>> >
>> > I posted a couple of patches handling Tomasz' comments but Kukjin
>> > prefers the approach in this patch (Discussion here:
>> > http://www.spinics.net/lists/linux-samsung-soc/msg38742.html).
>> > Can you please review the patch.
>>
>> This is a gentle reminder. The patch is required for serial enablement
>> on the new exynos7 SoC, kindly take a look.
>
> What patch?  I fail to see anything in my inboxes that I can apply, only
> this long thread that makes no sense at all.
>
> Please resend anything that you want to have applied, in a format that I
> can apply it, _AND_ get everyone to agree that it is the correct
> solution.
>
> Asking me to go look up random web archives, of mailing list threads I
> was never copied on, is a sure way to get your email ignored, as again,
> there is nothing I can do with it.  You know better than this.

Apologies for the patch not reaching you. I will re-send it right now.
Kukjin Kim has already approved the approach under discussion; however
the patch needs to go via Kukjin's tree due to other patches that
depend on it. Hence, I require your ack on it.

Once again, sorry for the inconvenience.

Thanks,
Abhilash
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Patch

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 81f6ee7..e6c0bcb 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -249,14 +249,14 @@  config SERIAL_SAMSUNG
 
 config SERIAL_SAMSUNG_UARTS_4
 	bool
-	depends on PLAT_SAMSUNG
+	depends on SERIAL_SAMSUNG
 	default y if !(CPU_S3C2410 || CPU_S3C2412 || CPU_S3C2440 || CPU_S3C2442)
 	help
 	  Internal node for the common case of 4 Samsung compatible UARTs
 
 config SERIAL_SAMSUNG_UARTS
 	int
-	depends on PLAT_SAMSUNG
+	depends on SERIAL_SAMSUNG
 	default 4 if SERIAL_SAMSUNG_UARTS_4 || CPU_S3C2416
 	default 3
 	help