linux-kernel - Re: [PATCH v7 2/3] clk: clk-pic32: Add PIC32 clock driver

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Message-ID: <56C80FC3.8050205@microchip.com>
Date:	Sat, 20 Feb 2016 12:33:31 +0530
From:	Purna Chandra Mandal <purna.mandal@...rochip.com>
To:	Michael Turquette <mturquette@...libre.com>,
	Joshua Henderson <joshua.henderson@...rochip.com>,
	<linux-kernel@...r.kernel.org>
CC:	<linux-mips@...ux-mips.org>, <ralf@...ux-mips.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	<linux-clk@...r.kernel.org>
Subject: Re: [PATCH v7 2/3] clk: clk-pic32: Add PIC32 clock driver

On 02/20/2016 01:46 AM, Michael Turquette wrote:

> Quoting Joshua Henderson (2016-02-19 08:25:35)
>> +const struct clk_ops pic32_roclk_ops = {
>> +       .enable                 = roclk_enable,
>> +       .disable                = roclk_disable,
>> +       .is_enabled             = roclk_is_enabled,
>> +       .get_parent             = roclk_get_parent,
>> +       .set_parent             = roclk_set_parent,
>> +       .determine_rate         = roclk_determine_rate,
>> +       .recalc_rate            = roclk_recalc_rate,
>> +       .round_rate             = roclk_round_rate,
>> +       .set_rate_and_parent    = roclk_set_rate_and_parent,
>> +       .set_rate               = roclk_set_rate,
>> +       .init                   = roclk_init,
>> +};
> You can remove .round_rate and only use .determine_rate.

Ack. Will remove .round_rate.

> ...
>> +CLK_OF_DECLARE(pic32mzda_clk, "microchip,pic32mzda-clk", pic32mzda_clock_init);
> Can you make this a platform_driver instead of using CLK_OF_DECLARE? I
> asked this in v6 but there was no response.

Mike,
I tried to use platform_driver approach, but didn't work for me.
On MIPS/PIC32 first call of clk_get() happens from "start_kernel -> time_init()->
plat_time_init()" which is very early in boot sequence even before execution of
early_initcall(). In short, by platform_driver way I'was not able to register clock(s)
before the first clock user becomes ready. Whereas with CLK_OF_DECLARE() I can
explicitly call of_clk_init() in plat_time_init() just before calling clk_get().

Please suggest me if you have any reference to avoid my case.

> Regards,
> Mike
>
>> -- 
>> 1.7.9.5
>>