[PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Ian W MORRISON]

The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
---
 drivers/tty/serdev/Kconfig | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig
index cdc6b820cf93..a9fb09a9c105 100644
--- a/drivers/tty/serdev/Kconfig
+++ b/drivers/tty/serdev/Kconfig
@@ -2,7 +2,8 @@
 # Serial bus device driver configuration
 #
 menuconfig SERIAL_DEV_BUS
-	tristate "Serial device bus"
+	bool "Serial device bus"
+	default y
 	help
 	  Core support for devices connected via a serial port.
 
@@ -11,6 +12,6 @@ if SERIAL_DEV_BUS
 config SERIAL_DEV_CTRL_TTYPORT
 	bool "Serial device TTY port controller"
 	depends on TTY
-	depends on SERIAL_DEV_BUS != m
+	default y
 
 endif
-- 
2.11.0

Re: [PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Greg Kroah-Hartman]

On Sat, Oct 07, 2017 at 05:16:31PM +1100, Ian W MORRISON wrote:
> The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
> ---
>  drivers/tty/serdev/Kconfig | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig
> index cdc6b820cf93..a9fb09a9c105 100644
> --- a/drivers/tty/serdev/Kconfig
> +++ b/drivers/tty/serdev/Kconfig
> @@ -2,7 +2,8 @@
>  # Serial bus device driver configuration
>  #
>  menuconfig SERIAL_DEV_BUS
> -	tristate "Serial device bus"
> +	bool "Serial device bus"
> +	default y
>  	help
>  	  Core support for devices connected via a serial port.
>  
> @@ -11,6 +12,6 @@ if SERIAL_DEV_BUS
>  config SERIAL_DEV_CTRL_TTYPORT
>  	bool "Serial device TTY port controller"
>  	depends on TTY
> -	depends on SERIAL_DEV_BUS != m
> +	default y
>  
>  endif
> -- 
> 2.11.0


Hi,

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Re: [PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Marcel Holtmann]

Hi Ian,

> The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
> ---
> drivers/tty/serdev/Kconfig | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig
> index cdc6b820cf93..a9fb09a9c105 100644
> --- a/drivers/tty/serdev/Kconfig
> +++ b/drivers/tty/serdev/Kconfig
> @@ -2,7 +2,8 @@
> # Serial bus device driver configuration
> #
> menuconfig SERIAL_DEV_BUS
> -	tristate "Serial device bus"
> +	bool "Serial device bus"
> +	default y
> 	help
> 	  Core support for devices connected via a serial port.
> 
> @@ -11,6 +12,6 @@ if SERIAL_DEV_BUS
> config SERIAL_DEV_CTRL_TTYPORT
> 	bool "Serial device TTY port controller"
> 	depends on TTY
> -	depends on SERIAL_DEV_BUS != m
> +	default y

actually we made hci_nokia.c be buildable as separate module. We might need to do the same for hci_bcm.c to avoid forcing SERIAL_DEV_BUS into a bool. Or you need to explain the reason behind this change a bit better.

Regards

Marcel

Re: [PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Ian W MORRISON]

On 7 October 2017 at 17:42, Marcel Holtmann <marcel-kz+m5ild9QBg9hUCZPvPmw@public.gmane.org> wrote:
> Hi Ian,
>
>> The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
>> ---
>> drivers/tty/serdev/Kconfig | 5 +++--
>> 1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig
>> index cdc6b820cf93..a9fb09a9c105 100644
>> --- a/drivers/tty/serdev/Kconfig
>> +++ b/drivers/tty/serdev/Kconfig
>> @@ -2,7 +2,8 @@
>> # Serial bus device driver configuration
>> #
>> menuconfig SERIAL_DEV_BUS
>> -     tristate "Serial device bus"
>> +     bool "Serial device bus"
>> +     default y
>>       help
>>         Core support for devices connected via a serial port.
>>
>> @@ -11,6 +12,6 @@ if SERIAL_DEV_BUS
>> config SERIAL_DEV_CTRL_TTYPORT
>>       bool "Serial device TTY port controller"
>>       depends on TTY
>> -     depends on SERIAL_DEV_BUS != m
>> +     default y
>
> actually we made hci_nokia.c be buildable as separate module. We might need to do the same for hci_bcm.c to avoid forcing SERIAL_DEV_BUS into a bool. Or you need to explain the reason behind this change a bit better.
>
> Regards
>
> Marcel
>

Hi Marcel,

For serdev to support for devices connected via a serial port such as
a tty (for example an ACPI enumerated BT driver) its code hooks into
TTY code meaning serdev can no longer be compiled as a module for this
functionality to work. With CONFIG_SERIAL_DEV_BUS originally being
defined as a tristate a provision was made when compiling serdev as a
module to return ENODEV when trying to register a tty port. This
provision still exists with CONFIG_SERIAL_DEV_BUS defined as a bool
because CONFIG_SERIAL_DEV_CTRL_TTYPORT actually controls this.

My patch also aligns CONFIG_SERIAL_DEV_BUS (serdev) which provides
"Core serial port support" to CONFIG_SERIAL_NONSTANDARD or
"Non-standard serial port support" as this seems logical comparison.
CONFIG_SERIAL_NONSTANDARD is a bool similar to how I've made
CONFIG_SERIAL_DEV_BUS a bool.

Whilst it may be preferable to make hci_bcm.c buildable as separate
module like hci_nokia.c I don't relate the 'modularity' of bluetooth
drivers with the 'modularity' of a serial device bus as I see the
latter more similar to PCI support or ACPI support.

Because of the link and/or cross-over between serial port support and
tty support I believe serdev should be built-in rather than
modularized if and when it is required.

If this better explains the reason for the patch I can resubmit with
an updated changelog together with a signoff which I accidentally
during editing.

Regards,
Ian

Re: [PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Johan Hovold]

On Sat, Oct 07, 2017 at 05:16:31PM +1100, Ian W MORRISON wrote:
> The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
> ---
>  drivers/tty/serdev/Kconfig | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig
> index cdc6b820cf93..a9fb09a9c105 100644
> --- a/drivers/tty/serdev/Kconfig
> +++ b/drivers/tty/serdev/Kconfig
> @@ -2,7 +2,8 @@
>  # Serial bus device driver configuration
>  #
>  menuconfig SERIAL_DEV_BUS
> -	tristate "Serial device bus"
> +	bool "Serial device bus"
> +	default y

I understand why you want this (to prevent hci_bcm from breaking), but we
should generally not have new entries default to y.

>  	help
>  	  Core support for devices connected via a serial port.
>  
> @@ -11,6 +12,6 @@ if SERIAL_DEV_BUS
>  config SERIAL_DEV_CTRL_TTYPORT
>  	bool "Serial device TTY port controller"
>  	depends on TTY
> -	depends on SERIAL_DEV_BUS != m
> +	default y

Same here.

It may be better to have BT_HCIUART_BCM depend on (or select?)
SERIAL_DEV_CTRL_TTYPORT instead.

Johan

Re: [PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Marcel Holtmann]

Hi Johan,

>> The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
>> ---
>> drivers/tty/serdev/Kconfig | 5 +++--
>> 1 file changed, 3 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig
>> index cdc6b820cf93..a9fb09a9c105 100644
>> --- a/drivers/tty/serdev/Kconfig
>> +++ b/drivers/tty/serdev/Kconfig
>> @@ -2,7 +2,8 @@
>> # Serial bus device driver configuration
>> #
>> menuconfig SERIAL_DEV_BUS
>> -	tristate "Serial device bus"
>> +	bool "Serial device bus"
>> +	default y
> 
> I understand why you want this (to prevent hci_bcm from breaking), but we
> should generally not have new entries default to y.
> 
>> 	help
>> 	  Core support for devices connected via a serial port.
>> 
>> @@ -11,6 +12,6 @@ if SERIAL_DEV_BUS
>> config SERIAL_DEV_CTRL_TTYPORT
>> 	bool "Serial device TTY port controller"
>> 	depends on TTY
>> -	depends on SERIAL_DEV_BUS != m
>> +	default y
> 
> Same here.
> 
> It may be better to have BT_HCIUART_BCM depend on (or select?)
> SERIAL_DEV_CTRL_TTYPORT instead.

if we move SERIAL_DEV_BUS to bool, then I would just have it be selected by BT_HCIUART_BCM. Frankly the SERIAL_DEV_BUS option is pretty hard to find in the kernel config. And if we depend on TTY, but then select SERIAL_DEV_BUS, I think that is a good compromise.

Regards

Marcel

Re: [PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Ian W MORRISON]

On 10/8/17 6:57 AM, Marcel Holtmann wrote:
> Hi Johan,
> 
>>> The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
<snip>
>> I understand why you want this (to prevent hci_bcm from breaking), but we
>> should generally not have new entries default to y.
>>
<snip>
>> It may be better to have BT_HCIUART_BCM depend on (or select?)
>> SERIAL_DEV_CTRL_TTYPORT instead.
> 
> if we move SERIAL_DEV_BUS to bool, then I would just have it be selected by BT_HCIUART_BCM. Frankly the SERIAL_DEV_BUS option is pretty hard to find in the kernel config. And if we depend on TTY, but then select SERIAL_DEV_BUS, I think that is a good compromise.
> 
> Regards
> 
> Marcel
> 

Hi,

Many thanks for everyone's comments on my earlier patch to Kconfigs for ACPI serdev support.

I've submitted a revised patch set which addresses the points raised by making BT_HCIUART_BCM dependent on SERIAL_DEV_CTRL_TTYPORT which in turn is dependent on SERIAL_DEV_BUS and ensures that if SERIAL_DEV_BUS is selected is the code is build it.

Please can you review and let me know if any further changes are required?

Regards,
Ian

Re: [PATCH] serdev: Update drivers/tty/serdev/Kconfig for ACPI support

[Johan Hovold]

On Sat, Oct 07, 2017 at 09:57:40PM +0200, Marcel Holtmann wrote:
> Hi Johan,
> 
> >> The current Kconfig for serdev is not compatible when adding ACPI support as it does not work when built as a module as it requires config SERIAL_DEV_CTRL_TTYPORT to be set. This patch makes serdev compiled into the kernel if selected so that config SERIAL_DEV_CTRL_TTYPORT can be correctly set if requiring ACPI support.
> >> ---
> >> drivers/tty/serdev/Kconfig | 5 +++--
> >> 1 file changed, 3 insertions(+), 2 deletions(-)
> >> 
> >> diff --git a/drivers/tty/serdev/Kconfig b/drivers/tty/serdev/Kconfig
> >> index cdc6b820cf93..a9fb09a9c105 100644
> >> --- a/drivers/tty/serdev/Kconfig
> >> +++ b/drivers/tty/serdev/Kconfig
> >> @@ -2,7 +2,8 @@
> >> # Serial bus device driver configuration
> >> #
> >> menuconfig SERIAL_DEV_BUS
> >> -	tristate "Serial device bus"
> >> +	bool "Serial device bus"
> >> +	default y
> > 
> > I understand why you want this (to prevent hci_bcm from breaking), but we
> > should generally not have new entries default to y.
> > 
> >> 	help
> >> 	  Core support for devices connected via a serial port.
> >> 
> >> @@ -11,6 +12,6 @@ if SERIAL_DEV_BUS
> >> config SERIAL_DEV_CTRL_TTYPORT
> >> 	bool "Serial device TTY port controller"
> >> 	depends on TTY
> >> -	depends on SERIAL_DEV_BUS != m
> >> +	default y
> > 
> > Same here.
> > 
> > It may be better to have BT_HCIUART_BCM depend on (or select?)
> > SERIAL_DEV_CTRL_TTYPORT instead.
> 
> if we move SERIAL_DEV_BUS to bool, then I would just have it be
> selected by BT_HCIUART_BCM. Frankly the SERIAL_DEV_BUS option is
> pretty hard to find in the kernel config. And if we depend on TTY, but
> then select SERIAL_DEV_BUS, I think that is a good compromise.

The Bluetooth UART drivers already depend on on SERIAL_DEV_BUS (through
BT_HCIUART_SERDEV). And the problem with BT_HCIUART_BCM is that the
current ACPI devices really need SERIAL_DEV_CTRL_TTYPORT (and not just
serdev core).

And we should probably try to avoid selecting options if we can (to
avoid ending up with unmet dependencies).

Johan