linux-kernel - Re: [PATCH 25/26] clk: boston: Add a driver for MIPS Boston board clocks

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Date:   Tue, 30 Aug 2016 16:06:12 +0100
From:   Paul Burton <paul.burton@...tec.com>
To:     Stephen Boyd <sboyd@...eaurora.org>
CC:     <linux-mips@...ux-mips.org>, Ralf Baechle <ralf@...ux-mips.org>,
        Michael Turquette <mturquette@...libre.com>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 25/26] clk: boston: Add a driver for MIPS Boston board
 clocks

On 26/08/16 18:41, Stephen Boyd wrote:
>> +	if (err)
>> +		pr_err("failed to add DT provider: %d\n", err);
>> +}
>> +CLK_OF_DECLARE(clk_boston, "img,boston-clock", clk_boston_setup);
> 
> Please make this into a platform driver.

Hi Stephen,

The problem with this would be that we need to obtain the CPU clock rate
fairly early during boot in order to set up the clocksource & delay loop
etc. Using CLK_OF_DECLARE allows for that but if this were a platform
driver my understanding is that the clocks wouldn't become available
until some point later in boot. If I'm wrong & there's a way to avoid
that please let me know.

Also: why? If CLK_OF_DECLARE isn't liked, shouldn't that be documented
somewhere (ideally next to the declaration of CLK_OF_DECLARE in
include/linux/clk-provider.h)?

Thanks,
    Paul