linux-kernel - Re: [PATCH v9 4/9] arm: ks8695: Migrate debug

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Message-ID: <54043693.70502@linaro.org>
Date:	Mon, 01 Sep 2014 10:04:19 +0100
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	Greg Ungerer <gerg@...inux.org>,
	Russell King <linux@....linux.org.uk>
CC:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	spear-devel@...t.st.com, Arnd Bergmann <arnd@...db.de>,
	Paul Bolle <pebolle@...cali.nl>, patches@...aro.org,
	linaro-kernel@...ts.linaro.org,
	Arnd Bergmann <arnd.bergmann@...aro.org>
Subject: Re: [PATCH v9 4/9] arm: ks8695: Migrate debug_ll macros to shared
 directory

On 21/08/14 12:46, Greg Ungerer wrote:
> Hi Daniel,
> 
> On 20/08/14 01:16, Daniel Thompson wrote:
>> As part of the migration a couple of uart definitions have been copied
>> from of the platform specific header files.
>>
>> Note that, in order to keep oldconfig working nicely we must defer the
>> removal of arch/arm/mach-ks8695/include/mach/debug-macro.S until
>> DEBUG_LL_UART_NONE has been removed.
>>
>> Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
>> Cc: Russell King <linux@....linux.org.uk>
>> Cc: Greg Ungerer <gerg@...inux.org>
>> Cc: Arnd Bergmann <arnd.bergmann@...aro.org>
>> ---
>>   arch/arm/Kconfig.debug                                         |  8
>> ++++++++
>>   .../include/mach/debug-macro.S => include/debug/ks8695.S}      | 10
>> +++++++---
>>   2 files changed, 15 insertions(+), 3 deletions(-)
>>   rename arch/arm/{mach-ks8695/include/mach/debug-macro.S =>
>> include/debug/ks8695.S} (80%)
>>
>> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
>> index 9c46729..97c3058 100644
>> --- a/arch/arm/Kconfig.debug
>> +++ b/arch/arm/Kconfig.debug
>> @@ -348,6 +348,13 @@ choice
>>             Say Y here if you want the debug print routines to direct
>>             their output to UART1 serial port on KEYSTONE2 devices.
>>   +    config DEBUG_KS8695_UART
>> +        bool "KS8695 Debug UART"
>> +        depends on ARCH_KS8695
>> +        help
>> +          Say Y here if you want kernel low-level debugging support
>> +          on KS8695.
>> +
>>       config DEBUG_MMP_UART2
>>           bool "Kernel low-level debugging message via MMP UART2"
>>           depends on ARCH_MMP
>> @@ -1017,6 +1024,7 @@ config DEBUG_LL_INCLUDE
>>                    DEBUG_IMX6Q_UART || \
>>                    DEBUG_IMX6SL_UART || \
>>                    DEBUG_IMX6SX_UART
>> +    default "debug/ks8695.S" if DEBUG_KS8695_UART
>>       default "debug/msm.S" if DEBUG_MSM_UART || DEBUG_QCOM_UARTDM
>>       default "debug/omap2plus.S" if DEBUG_OMAP2PLUS_UART
>>       default "debug/s3c24xx.S" if DEBUG_S3C24XX_UART
>> diff --git a/arch/arm/mach-ks8695/include/mach/debug-macro.S
>> b/arch/arm/include/debug/ks8695.S
>> similarity index 80%
>> rename from arch/arm/mach-ks8695/include/mach/debug-macro.S
>> rename to arch/arm/include/debug/ks8695.S
>> index a79e489..961da1f 100644
>> --- a/arch/arm/mach-ks8695/include/mach/debug-macro.S
>> +++ b/arch/arm/include/debug/ks8695.S
>> @@ -1,5 +1,5 @@
>>   /*
>> - * arch/arm/mach-ks8695/include/mach/debug-macro.S
>> + * arch/arm/include/debug/ks8695.S
>>    *
>>    * Copyright (C) 2006 Ben Dooks <ben@...tec.co.uk>
>>    * Copyright (C) 2006 Simtec Electronics
>> @@ -11,8 +11,12 @@
>>    * published by the Free Software Foundation.
>>    */
>>   -#include <mach/hardware.h>
>> -#include <mach/regs-uart.h>
>> +#define KS8695_UART_PA    0x03ffe000
>> +#define KS8695_UART_VA    0xf00fe000
>> +#define KS8695_URTH    (0x04)
>> +#define KS8695_URLS    (0x14)
>> +#define URLS_URTE    (1 << 6)
>> +#define URLS_URTHRE    (1 << 5)
> 
> Whats the thinking behind moving these definitions here?
> Is there a plan to move/change regs-uart.h?

I am trying to move *all* the debug macros into arch/arm/include/debug
thus making all the debug macros multi-platform. To do this the macros
cannot use headers found in mach-ks8695 because that would not be
available on multi-platform builds.

The approach of moving a limited set of definitions into the macro is
how other debug macros have been migrated.

To make ks8695 fully multi-platform would likely require regs-uart.h
(and any associated driver) to migrate into drivers/tty/serial/ together
with a *huge* pile of other work that I doubt anyone has much appetite
for. Certainly I have no personal plans to seek further change on ks8695.

To be honest I'm only dabbling in this area at all in order to allow us
to remove a nasty KConfig hack for that breaks
multi_v7_defconfig+debug_ll on my two favoured test boards.


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