linux-kernel - Re: [PATCH v2 2/2] spi: coldfire-qspi: Use clk_prepare_enable and clk_disable

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Message-ID: <1616bb3e-ba20-46df-7818-c11c382a0d86@loongson.cn>
Date:   Thu, 16 Jul 2020 18:01:18 +0800
From:   zhangqing <zhangqing@...ngson.cn>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH v2 2/2] spi: coldfire-qspi: Use clk_prepare_enable and
 clk_disable_unprepare



On 07/15/2020 05:49 PM, Mark Brown wrote:
> On Wed, Jul 15, 2020 at 01:26:47PM +0800, Qing Zhang wrote:
>> Convert clk_enable() to clk_prepare_enable() and clk_disable() to
>> clk_disable_unprepare() respectively in the spi-coldfire-qspi.c.
> Like I said on the previous version are you sure that ColdFire uses the
> common clock framework and has the prepare calls?
Hi Mark,

Thanks for your reminder again.

I see the following comment and code in arch/m68k/coldfire/clk.c:

For more advanced ColdFire parts that have clocks that can be enabled
we supply enable/disable functions. These must properly define their
clocks in their platform specific code.

int clk_enable(struct clk *clk)
{
     unsigned long flags;
     spin_lock_irqsave(&clk_lock, flags);
     if ((clk->enabled++ == 0) && clk->clk_ops)
         clk->clk_ops->enable(clk);
     spin_unlock_irqrestore(&clk_lock, flags);

     return 0;
}
EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
     unsigned long flags;

     if (!clk)
         return;

     spin_lock_irqsave(&clk_lock, flags);
     if ((--clk->enabled == 0) && clk->clk_ops)
         clk->clk_ops->disable(clk);
     spin_unlock_irqrestore(&clk_lock, flags);
}
EXPORT_SYMBOL(clk_disable);

Thanks,
Qing