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Message-ID: <5200B2E9.8090009@free-electrons.com>
Date: Tue, 06 Aug 2013 10:25:13 +0200
From: Gregory CLEMENT <gregory.clement@...e-electrons.com>
To: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
CC: Andrew Lunn <andrew@...n.ch>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
Russell King <linux@....linux.org.uk>,
Jason Cooper <jason@...edaemon.net>,
Arnd Bergmann <arnd@...db.de>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
"Rafael J. Wysocki" <rjw@...k.pl>, Olof Johansson <olof@...om.net>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
Viresh Kumar <viresh.kumar@...aro.org>,
"grant.likely@...aro.org" <grant.likely@...aro.org>,
Shawn Guo <shawn.guo@...aro.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 05/16] ARM: mvebu: remove device tree parsing for cpu
nodes
On 05/08/2013 18:28, Sudeep KarkadaNagesha wrote:
> On 01/08/13 13:02, Jason Cooper wrote:
>> Sudeep,
>>
>> On Thu, Aug 01, 2013 at 10:54:44AM +0100, Sudeep KarkadaNagesha wrote:
>>> On 22/07/13 12:32, Sudeep KarkadaNagesha wrote:
>>>> From: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
>>>>
>>>> Currently set_secondary_cpus_clock assume the CPU logical ordering
>>>> and the MPDIR in DT are same, which is incorrect.
>>>>
>>>> Since the CPU device nodes can be retrieved in the logical ordering
>>>> using the DT helper, we can remove the devices tree parsing.
>>>>
>>>> This patch removes DT parsing by making use of of_get_cpu_node.
>>>>
>>>> Cc: Gregory Clement <gregory.clement@...e-electrons.com>
>>>> Cc: Andrew Lunn <andrew@...n.ch>
>>>> Cc: Jason Cooper <jason@...edaemon.net>
>>>> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@....com>
>>>
>>> Hi Gregory/Andrew/Jason,
>>>
>>> Does this change look fine for mvebu?
>>> If yes, can I have your ACKs ?
>>
>> Gregory is the one best suited to review/Ack this. He'll be back on
>> Monday.
>>
> Hi Gregory,
>
> Can you please review this patch ?
Your patch is a nice improvement, I reviewed it and I also tested it on the
Armada XP DB board.
You can add my:
Acked-by: Gregory Clement <gregory.clement@...e-electrons.com>
>
> Regards,
> Sudeep
>>>> ---
>>>> arch/arm/mach-mvebu/platsmp.c | 52 ++++++++++++++++++++-----------------------
>>>> 1 file changed, 24 insertions(+), 28 deletions(-)
>>>>
>>>> diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c
>>>> index ce81d30..001dd42 100644
>>>> --- a/arch/arm/mach-mvebu/platsmp.c
>>>> +++ b/arch/arm/mach-mvebu/platsmp.c
>>>> @@ -23,51 +23,47 @@
>>>> #include <linux/of.h>
>>>> #include <linux/mbus.h>
>>>> #include <asm/cacheflush.h>
>>>> +#include <asm/prom.h>
>>>> #include <asm/smp_plat.h>
>>>> #include "common.h"
>>>> #include "armada-370-xp.h"
>>>> #include "pmsu.h"
>>>> #include "coherency.h"
>>>>
>>>> +static struct clk *__init get_cpu_clk(int cpu)
>>>> +{
>>>> + struct clk *cpu_clk;
>>>> + struct device_node *np = of_get_cpu_node(cpu);
>>>> +
>>>> + if (WARN(!np, "missing cpu node\n"))
>>>> + return NULL;
>>>> + cpu_clk = of_clk_get(np, 0);
>>>> + if (WARN_ON(IS_ERR(cpu_clk)))
>>>> + return NULL;
>>>> + return cpu_clk;
>>>> +}
>>>> +
>>>> void __init set_secondary_cpus_clock(void)
>>>> {
>>>> - int thiscpu;
>>>> + int thiscpu, cpu;
>>>> unsigned long rate;
>>>> - struct clk *cpu_clk = NULL;
>>>> - struct device_node *np = NULL;
>>>> + struct clk *cpu_clk;
>>>>
>>>> thiscpu = smp_processor_id();
>>>> - for_each_node_by_type(np, "cpu") {
>>>> - int err;
>>>> - int cpu;
>>>> -
>>>> - err = of_property_read_u32(np, "reg", &cpu);
>>>> - if (WARN_ON(err))
>>>> - return;
>>>> -
>>>> - if (cpu == thiscpu) {
>>>> - cpu_clk = of_clk_get(np, 0);
>>>> - break;
>>>> - }
>>>> - }
>>>> - if (WARN_ON(IS_ERR(cpu_clk)))
>>>> + cpu_clk = get_cpu_clk(thiscpu);
>>>> + if (!cpu_clk)
>>>> return;
>>>> clk_prepare_enable(cpu_clk);
>>>> rate = clk_get_rate(cpu_clk);
>>>>
>>>> /* set all the other CPU clk to the same rate than the boot CPU */
>>>> - for_each_node_by_type(np, "cpu") {
>>>> - int err;
>>>> - int cpu;
>>>> -
>>>> - err = of_property_read_u32(np, "reg", &cpu);
>>>> - if (WARN_ON(err))
>>>> + for_each_possible_cpu(cpu) {
>>>> + if (cpu == thiscpu)
>>>> + continue;
>>>> + cpu_clk = get_cpu_clk(cpu);
>>>> + if (!cpu_clk)
>>>> return;
>>>> -
>>>> - if (cpu != thiscpu) {
>>>> - cpu_clk = of_clk_get(np, 0);
>>>> - clk_set_rate(cpu_clk, rate);
>>>> - }
>>>> + clk_set_rate(cpu_clk, rate);
>>>> }
>>>> }
>>>>
>>>>
>>>
>>>
>>
>
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
--
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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