On 03/21/2013 04:04 PM, Rajendra Nayak wrote:
> On Thursday 21 March 2013 07:24 PM, Roger Quadros wrote:
>> On 03/21/2013 03:08 PM, Rajendra Nayak wrote:
>>> []..
>>>
>>>> diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c
>>>> index 0274ff7..23f2064 100644
>>>> --- a/arch/arm/mach-omap2/board-generic.c
>>>> +++ b/arch/arm/mach-omap2/board-generic.c
>>>> @@ -158,7 +158,7 @@ DT_MACHINE_START(OMAP4_DT, "Generic OMAP4 (Flattened Device Tree)")
>>>> .init_irq = omap_gic_of_init,
>>>> .init_machine = omap_generic_init,
>>>> .init_late = omap4430_init_late,
>>>> - .init_time = omap4_local_timer_init,
>>>> + .init_time = omap4_init_time,
>>>> .dt_compat = omap4_boards_compat,
>>>> .restart = omap44xx_restart,
>>>> MACHINE_END
>>>
>>> []..
>>>> +#ifdef CONFIG_OF
>>>> +int __init omap4_clk_init_dt(void)
>>>> +{
>>>> + struct device_node *np;
>>>> +
>>>> + np = of_find_compatible_node(NULL, NULL, "ti,omap4-scrm");
>>>> + if (np) {
>>>> + scrm_data.clks = scrm_clks;
>>>> + scrm_data.clk_num = ARRAY_SIZE(scrm_clks);
>>>> + of_clk_add_provider(np, of_clk_src_onecell_get, &scrm_data);
>>>> + }
>>>> +
>>>> + return 0;
>>>> +}
>>>
>>> []..
>>>> +
>>>> +void __init omap4_init_time(void)
>>>> +{
>>>> + omap4_clk_init_dt();
>>>> + omap4_local_timer_init();
>>>> +}
>>>
>>> I guess you did all this because of_clk_add_provider() needs
>>> slab to be initialized. With the below patch[1], now clk inits
>>> happen within .init_timer already, so none of this would
>>> be needed.
>>>
>>> [1] http://www.spinics.net/lists/arm-kernel/msg231288.html
>>>
>>
>> Right. I can then call omap4_clk_init_dt() from within omap4xxx_clk_init().
>>
>> Any comments about the main subject? Does the approach look fine?
>
> It looks fine, except for the fact that I was wondering if the clock
> provider needs to restrict itself to SCRM.
> Nishant Menon brought up a need for specifying the mpu clock source
> from within DT, to be able to use a generic cpufreq driver.
> It could be a provider (not specific to scrm, but having only scrm
> clocks for now) which we could add clocks as and when we see a need for
> them to be specified from DT.
OK, I will revise the patch to not make it SCRM specific.
>
> Btw, you need to copy Paul Walmsley for any clock related patches as
> he is the OMAP clock maintainer.
OK. Thanks for letting know.
cheers,
-roger
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