linux-kernel - Re: [PATCH 2/4] ARM: mvebu: Move SCU power up in a function

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Message-ID: <544A41E5.2090802@free-electrons.com>
Date:	Fri, 24 Oct 2014 14:11:17 +0200
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
CC:	Jason Cooper <jason@...edaemon.net>, Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] ARM: mvebu: Move SCU power up in a function

Hi Thomas,

On 24/10/2014 14:05, Thomas Petazzoni wrote:
> Dear Gregory CLEMENT,
> 
> On Thu, 23 Oct 2014 20:14:28 +0200, Gregory CLEMENT wrote:
> 
>> +ENTRY(power_up_scu)
>> +	mrc     p15, 4, r1, c15, c0	@ get SCU base address
>> +	orr	r1, r1, #0x8		@ SCU CPU Power Status Register
>> +	mrc	15, 0, r0, cr0, cr0, 5	@ get the CPU ID
>> +	and	r0, r0, #15
>> +	add	r1, r1, r0
>> +	mov	r0, #0x0
>> +	strb	r0, [r1]		@ switch SCU power state to Normal mode
>> +	ret	lr
>> +ENDPROC(power_up_scu)
> 
> Since this function is not static, I think it might be a good idea to
> use a prefix that makes it more specific to the platform in order to
> not pollute the global namespace. Maybe something like
> 'armada_38x_scu_power_up', or something like that.

Yes given the fact that this function is declared in the mach-mveu folder
it is sensible to use a more specific name. However the function itself
is not specific at all to an SoC. This function could be used for any Cortex A9
using the SCU.


Thanks,

Gregory



-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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