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

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Date:   Fri, 24 Feb 2023 11:10:14 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     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,
        zhuyinbo <zhuyinbo@...ngson.cn>
Subject: Re: [PATCH v10 2/4] clk: clk-loongson2: add clock controller driver support

Quoting zhuyinbo (2023-02-22 18:16:49)
> 
> 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()
> 

It can be the same file if you want. But then it can't be a module. Up
to you what you want to do there.