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Re: [PATCH 06/11] tty: serial: Add Actions Semi Owl UART earlycon

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Am 16.02.2017 um 14:41 schrieb Arnd Bergmann:
> On Wednesday, February 15, 2017 5:55:23 PM CET Andreas Färber wrote:
>> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
>> index 6117ac8..9d4213c 100644
>> --- a/drivers/tty/serial/Kconfig
>> +++ b/drivers/tty/serial/Kconfig
>> @@ -1677,6 +1677,25 @@ config SERIAL_MVEBU_CONSOLE
>>           and warnings and which allows logins in single user mode)
>>           Otherwise, say 'N'.
>>  
>> +config SERIAL_OWL
>> +       bool "Actions Semi Owl serial port support"
>> +       depends on ARCH_OWL || COMPILE_TEST
>> +       select SERIAL_CORE
>> +       help
>> +         This driver is for Actions Semi S500/S900 SoC's UART.
>> +         Say 'Y' here if you wish to use the on-board serial port.
>> +         Otherwise, say 'N'.
>> +
>>
> 
> This could maybe use a word of information about how there isn't
> actually a uart driver in this series, only an earlycon driver.

Yeah, I have added a sentence to the other one. Maybe also add a select?

> Do you plan to add the actual tty driver soon? If not, maybe
> only add one Kconfig symbol for the earlycon support.

So, I completed the driver the weekend and can see the full console
output, but there are still output glitches, possible locking issues up
to RCU stalls and soft lockups, and only stubbed out baudrate support.

Therefore I would rather keep the full driver as follow-up RFC in v2,
unless I get it fixed during Hackweek. In the earlycon I am confident,
and the only Kconfig change then is to switch from bool to tristate and
to drop the newly added sentence again.

Regards,
Andreas

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[PATCH 00/11] ARM: Initial Actions Semi S500 and S900 enablement Andreas Färber <afaerber@suse.de> - 2017-02-15 18:00 +0100
  [PATCH 06/11] tty: serial: Add Actions Semi Owl UART earlycon Andreas Färber <afaerber@suse.de> - 2017-02-15 18:00 +0100
    Re: [PATCH 06/11] tty: serial: Add Actions Semi Owl UART earlycon Arnd Bergmann <arnd@arndb.de> - 2017-02-16 14:50 +0100
      Re: [PATCH 06/11] tty: serial: Add Actions Semi Owl UART earlycon Andreas Färber <afaerber@suse.de> - 2017-02-20 14:50 +0100
        Re: [PATCH 06/11] tty: serial: Add Actions Semi Owl UART earlycon Arnd Bergmann <arnd@arndb.de> - 2017-02-20 16:20 +0100
  [PATCH 01/11] Documentation: devicetree: Add vendor prefix for Actions Semi Andreas Färber <afaerber@suse.de> - 2017-02-15 18:00 +0100
  [PATCH 03/11] ARM: Prepare Actions Semi S500 Andreas Färber <afaerber@suse.de> - 2017-02-15 18:00 +0100
  [PATCH 11/11] ARM64: dts: Prepare Actions Semi S900 and Bubblegum-96 Andreas Färber <afaerber@suse.de> - 2017-02-15 18:00 +0100
    Re: [PATCH 11/11] ARM64: dts: Prepare Actions Semi S900 and  Bubblegum-96 Andreas Färber <afaerber@suse.de> - 2017-02-15 19:20 +0100
  [PATCH 05/11] Documentation: devicetree: serial: Document Actions Semi Owl UARTs Andreas Färber <afaerber@suse.de> - 2017-02-15 18:00 +0100
  [PATCH 09/11] Documentation: devicetree: Add vendor prefix for uCRobotics Andreas Färber <afaerber@suse.de> - 2017-02-15 18:00 +0100
  [PATCH 07/11] Documentation: kernel-parameters: Document owl earlycon Andreas Färber <afaerber@suse.de> - 2017-02-15 18:10 +0100
  [PATCH 08/11] ARM: dts: Prepare Actions Semi S500 and LeMaker Guitar Andreas Färber <afaerber@suse.de> - 2017-02-15 18:10 +0100
    Re: [PATCH 08/11] ARM: dts: Prepare Actions Semi S500 and LeMaker  Guitar Andreas Färber <afaerber@suse.de> - 2017-02-15 18:30 +0100
    Re: [PATCH 08/11] ARM: dts: Prepare Actions Semi S500 and LeMaker  Guitar Andreas Färber <afaerber@suse.de> - 2017-02-24 02:10 +0100
  [PATCH 04/11] ARM64: Prepare Actions Semi S900 Andreas Färber <afaerber@suse.de> - 2017-02-15 18:10 +0100
    Re: [PATCH 04/11] ARM64: Prepare Actions Semi S900 Arnd Bergmann <arnd@arndb.de> - 2017-02-16 14:50 +0100
      Re: [PATCH 04/11] ARM64: Prepare Actions Semi S900 Andreas Färber <afaerber@suse.de> - 2017-02-17 01:40 +0100
        Re: [PATCH 04/11] ARM64: Prepare Actions Semi S900 Arnd Bergmann <arnd@arndb.de> - 2017-02-17 12:40 +0100
  [PATCH 02/11] Documentation: devicetree: arm: Document Actions Semi S500 Andreas Färber <afaerber@suse.de> - 2017-02-15 18:10 +0100
  [PATCH 10/11] Documentation: devicetree: arm: Document Actions Semi S900 Andreas Färber <afaerber@suse.de> - 2017-02-15 18:10 +0100
    Re: [PATCH 10/11] Documentation: devicetree: arm: Document Actions  Semi S900 Rob Herring <robh@kernel.org> - 2017-02-27 15:30 +0100
  Re: [PATCH 00/11] ARM: Initial Actions Semi S500 and S900 enablement Arnd Bergmann <arnd@arndb.de> - 2017-02-16 14:50 +0100

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