linux-kernel - Re: [PATCH v2 4/4] ARM: debug: qcom: add UART addresses to Kconfig help

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Date:	Tue, 27 May 2014 15:05:53 +0300
From:	Georgi Djakov <gdjakov@...sol.com>
To:	Matthias Brugger <matthias.bgg@...il.com>
CC:	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, sboyd@...eaurora.org,
	rvaswani@...eaurora.org, davidb@...eaurora.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 4/4] ARM: debug: qcom: add UART addresses to Kconfig
 help

On 05/26/2014 08:17 PM, Matthias Brugger wrote:
> 2014-05-26 15:45 GMT+02:00 Georgi Djakov <gdjakov@...sol.com>:
>> On 23.05.14, 19:39, Matthias Brugger wrote:
>>>
>>> 2014-05-23 17:12 GMT+02:00 Georgi Djakov <gdjakov@...sol.com>:
>>>>
>>>> Add information about the APQ8084 debug UART physical and virtual
>>>> addresses in the DEBUG_QCOM_UARTDM Kconfig help section.
>>>> Requires: https://lkml.org/lkml/2014/4/14/312
>>>>
>>>> Signed-off-by: Georgi Djakov <gdjakov@...sol.com>
>>>> ---
>>>>  arch/arm/Kconfig.debug |    1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
>>>> index 40ee328..e71723d 100644
>>>> --- a/arch/arm/Kconfig.debug
>>>> +++ b/arch/arm/Kconfig.debug
>>>> @@ -376,6 +376,7 @@ choice
>>>>                   their output to the serial port on Qualcomm devices.
>>>>
>>>>                   ARCH      DEBUG_UART_PHYS   DEBUG_UART_BASE
>>>> +                 APQ8084   0xf995e000        0xfa75e000
>>>>                   MSM8X60   0x19c40000        0xf0040000
>>>>                   MSM8960   0x16440000        0xf0040000
>>>>                   MSM8974   0xf991e000        0xfa71e000
>>>
>>>
>>> You don't have any uart defined in your dts. You should add them
>>> before any adding low level debug support.
>>> Otherwise there might be problems in booting a multi-platform kernel.
>>>
>>
>> Thanks for the comment! As the uart depends on clocks, i am adding it to the
>> dts as part of my global clock controller patchset [1].
>> In this patch i am just adding some information to the help section.
>> Do you see any problem with this?
> 
> Are the patches for the clock controller applied already?
> If not, I would consider to add this patch to clock controller series.
> 

No, they are not applied yet. The uart dts definition depends on clocks, but the
DEBUG_LL support does not. And the DEBUG_LL support is already there as it is 
common with other SoCs. I am sorry, but i don't see dependency between the dts
definition and this patch. Could you explain please?

Thanks,
Georgi

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