linux-kernel - Re: [PATCH v10 2/4] clk: clk-loongson2: add clock controller driver support

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Message-ID: <d2519ebc-8f71-1cf0-9ec8-a65a7f094853@loongson.cn>
Date:   Thu, 23 Feb 2023 10:16:49 +0800
From:   zhuyinbo <zhuyinbo@...ngson.cn>
To:     Stephen Boyd <sboyd@...nel.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jianmin Lv <lvjianmin@...ngson.cn>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, liupeibao@...ngson.cn,
        loongarch@...ts.linux.dev, wanghongliang@...ngson.cn
Subject: Re: [PATCH v10 2/4] clk: clk-loongson2: add clock controller driver
 support


在 2023/2/23 上午5:00, Stephen Boyd 写道:
> Quoting zhuyinbo (2023-02-21 21:10:14)
>>>>> yes, the use of dts doesn't require the use of CLK_OF_DECLARE and can
>>>>> use platform_driver_register
>>>>>
>>>>> but my drvier not use platform_driver_register to register clk and use
>>>>> CLK_OF_DECLARE to match of_clk_init.
>>>> of_clk_init() is there to register clks that are needed for early init,
>>>> i.e. the clockevent/clocksource or the root interrupt controller
>>>> (irqchip). Otherwise, it isn't necessary to register clks via
>>>> of_clk_init().
>>> okay, I got it.
>> and,  the time driver  get clock by CCF that ask loongson2 clock driver
>> use CLK_OF_DECLARE
>>
>> to match of_clk_init.   because  the timer_probe  is very early and the
>> timer driver was use TIMER_OF_DECLARE
>>
>> to match time_probe.
>>
> If you have a time driver that gets clks, register those early with
> CLK_OF_DECLARE_DRIVER() and then have a platform driver for the rest of
> the clk tree that registers clks later.

okay, I got it.  and this series patch I will use platform driver. 
later, if the loongson2 time driver use the

CLK_OF_DECLARE style I will make a alone time clk driver for it that 
use  CLK_OF_DECLARE_DRIVER()