linux-kernel - Re: [PATCH v5 07/14] ARM: mvebu: Extend the pmsu registers

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Date:	Wed, 26 Mar 2014 13:01:44 +0100
From:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>
CC:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.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 v5 07/14] ARM: mvebu: Extend the pmsu registers

On 26/03/2014 13:04, Sebastian Hesselbarth wrote:
> On 03/25/2014 11:48 PM, Gregory CLEMENT wrote:
>> The initial binding for PMSU were wrong. It didn't take into account
>> all the registers from the PMSU and moreover it referred to registers
>> which are not part of PMSU.
>>
>> The Power Management Unit Service block also controls the Coherency
>> Fabric subsystem. These registers are needed for the CPU idle
>> implementation for the Armada 370/XP, it allows to enter a deep CPU
>> idle state where the Coherency Fabric and the L2 cache are powered
>> down.
>>
>> This commit add support for a new compatible for the PMSU node
>> including the block related to the coherency fabric. It also keeps
>> compatibility with the old binding
>>
>> This patch also adds warnings if one of the base registers set can't
>> be ioremapped.
>>
>> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
>> ---
>>   arch/arm/mach-mvebu/pmsu.c | 47 +++++++++++++++++++++++++++++++++++++++++-----
>>   1 file changed, 42 insertions(+), 5 deletions(-)
>>
>> diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
>> index d71ef53107c4..865bcb651e01 100644
>> --- a/arch/arm/mach-mvebu/pmsu.c
>> +++ b/arch/arm/mach-mvebu/pmsu.c
> [...]
>> +static void __init armada_370_xp_pmsu_legacy_init(struct device_node *np)
>> +{
>> +	u32 addr;
>> +	pr_warn("*** Warning ***  Using an old binding which will be deprecated\n");
>> +	/* We just need the adress, we already know the size */
>> +	addr = be32_to_cpu(*of_get_address(np, 0, NULL, NULL));
>> +	addr -= PMSU_BASE_OFFSET;
>> +	pmsu_mp_base = ioremap(addr, PMSU_REG_SIZE);
>> +	of_node_put(np);
> 
> When messing with OF passed resources, I suggest to use
> of_address_to_resource() and work on the struct resource
> instead. The be32_to_cpu pointing to an immediate just looks
> strange.

Actually it was taken from of_address_to_resource()! As I didn't need
the size I have just took the usefull part for my need.

> 
> Sebastian
> 


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