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SubjectRe: [PATCH v2 2/2] spi: coldfire-qspi: Use clk_prepare_enable and clk_disable_unprepare
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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

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