linux-kernel - Re: [PATCH v2 1/2] clk: Hi3660: change to register crgctrl clock with CLK_OF_DECLARE

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Date:   Thu, 18 May 2017 11:32:26 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Wei Xu <xuwei5@...ilicon.com>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Guodong Xu <guodong.xu@...aro.org>,
        Zhong Kaihua <zhongkaihua@...wei.com>,
        Chen Jun <chenjun14@...wei.com>,
        Zhangfei Gao <zhangfei.gao@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 1/2] clk: Hi3660: change to register crgctrl clock
 with CLK_OF_DECLARE_DRIVER

On Thu, May 18, 2017 at 09:50:46AM +0800, Leo Yan wrote:
> The timer will register into system at very early phase at kernel boot;
> if timer needs to use clock, the clock should be get ready in function
> of_clk_init() so later the timer driver probe can retrieve clock
> successfully. This is finished in below flow on arm64:
> 
>   start_kernel()
>     `-> time_init()
>           `-> of_clk_init(NULL)    => register timer's clock
>           `-> clocksource_probe()  => register timer
> 
> On Hi3660 the sp804 timer uses clock "osc32k", this clock is registered
> as platform driver rather than CLK_OF_DECLARE_DRIVER method. As result,
> sp804 timer probe returns failure due if cannot bind clock properly.
> To fix the failure, this patch is to change crgctrl clock registration
> from platform driver to CLK_OF_DECLARE_DRIVER method so the clocks can
> be registered ahead with function of_clk_init() and then timer driver
> can use it.
> 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  drivers/clk/hisilicon/clk-hi3660.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/hisilicon/clk-hi3660.c b/drivers/clk/hisilicon/clk-hi3660.c
> index fd5ce7f..4e5713b 100644
> --- a/drivers/clk/hisilicon/clk-hi3660.c
> +++ b/drivers/clk/hisilicon/clk-hi3660.c
> @@ -547,10 +547,10 @@ static void hi3660_clk_crgctrl_init(struct device_node *np)
>  				  ARRAY_SIZE(hi3660_crgctrl_divider_clks),
>  				  clk_data);
>  }
> +CLK_OF_DECLARE_DRIVER(hi3660_clk_crgctrl, "hisilicon,hi3660-crgctrl",
> +		      hi3660_clk_crgctrl_init);
>  
>  static const struct of_device_id hi3660_clk_match_table[] = {
> -	{ .compatible = "hisilicon,hi3660-crgctrl",
> -	  .data = hi3660_clk_crgctrl_init },
>  	{ .compatible = "hisilicon,hi3660-pctrl",
>  	  .data = hi3660_clk_pctrl_init },
>  	{ .compatible = "hisilicon,hi3660-pmuctrl",

Why not do the change for all the clocks and remove the
hi3660_clk_match_table[]? and all the related platform driver code?

That will be consistent with the other clk-hi* drivers.

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