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SubjectRe: [PATCH v3 05/16] ARM: mvebu: remove device tree parsing for cpu nodes
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@arm.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@free-electrons.com>
>>> Cc: Andrew Lunn <andrew@lunn.ch>
>>> Cc: Jason Cooper <jason@lakedaemon.net>
>>> Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.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 ?

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);
>>> }
>>> }
>>>
>>>
>>
>>
>




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