linux-kernel - Re: [PATCH V3 7/7] ARM: DRA: Enable Crossbar IP support for DRA7XX

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Date:	Wed, 13 Nov 2013 09:32:44 -0600
From:	Nishanth Menon <nm@...com>
To:	Sricharan R <r.sricharan@...com>, Rajendra Nayak <rnayak@...com>
CC:	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linus.walleij@...aro.org>,
	<linux@....linux.org.uk>, <tony@...mide.com>,
	<marc.zyngier@....com>, <grant.likely@...aro.org>,
	<mark.rutland@....com>, <robherring2@...il.com>,
	<tglx@...utronix.de>, <santosh.shilimkar@...com>,
	<galak@...eaurora.org>
Subject: Re: [PATCH V3 7/7] ARM: DRA: Enable Crossbar IP support for DRA7XX

On 11/11/2013 11:47 PM, Sricharan R wrote:
> Hi Rajendra,
> 
> On Tuesday 12 November 2013 11:11 AM, Rajendra Nayak wrote:
>> On Tuesday 05 November 2013 06:44 PM, Sricharan R wrote:
>>> Enable the crossbar IP support for DRA7xx soc.
>>>
>>> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
>>> Cc: Rajendra Nayak <rnayak@...com>
>>> Cc: Tony Lindgren <tony@...mide.com>
>>> Signed-off-by: Sricharan R <r.sricharan@...com>
>>> ---
>>>  arch/arm/mach-omap2/Kconfig        |    1 +
>>>  arch/arm/mach-omap2/omap4-common.c |    4 ++++
>>>  2 files changed, 5 insertions(+)
>>>
>>> diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
>>> index b5fb5f7..2086c65 100644
>>> --- a/arch/arm/mach-omap2/Kconfig
>>> +++ b/arch/arm/mach-omap2/Kconfig
>>> @@ -141,6 +141,7 @@ config SOC_DRA7XX
>>>  	select ARM_GIC
>>>  	select HAVE_SMP
>>>  	select COMMON_CLK
>>> +	select IRQ_CROSSBAR
>>>  
>>>  comment "OMAP Core Type"
>>>  	depends on ARCH_OMAP2
>>> diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
>>> index 5791143..274cbfa 100644
>>> --- a/arch/arm/mach-omap2/omap4-common.c
>>> +++ b/arch/arm/mach-omap2/omap4-common.c
>>> @@ -22,6 +22,7 @@
>>>  #include <linux/of_platform.h>
>>>  #include <linux/export.h>
>>>  #include <linux/irqchip/arm-gic.h>
>>> +#include <linux/irqchip/irq-crossbar.h>
>>>  #include <linux/of_address.h>
>>>  #include <linux/reboot.h>
>>>  
>>> @@ -282,9 +283,12 @@ void __init omap_gic_of_init(void)
>>>  
>>>  skip_errata_init:
>>>  	omap_wakeupgen_init();
>>> +	if (soc_is_dra7xx())
>>> +		crossbar_init();
>> Its good if this is called irqcrossbar_init() to avoid confusion
>> with the dma crossbar which also exists in dra7 devices.
>>
>  Ya makes sense. Will change this.
Also why not call it without explicit soc check? there is already
parse for of_find_matching_node(NULL, crossbar_match); to see if we
have a match in the crossbar_init. OR call it from dra7 init without
SoC check dependency?

Rationale - with more TI SoCs trending towards crossbar, we dont need
to keep adding to the soc_is checks, further, we intend to remove
soc_is checks in it's entirety..


-- 
Regards,
Nishanth Menon
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