Re: [PATCH -next v2 12/25] spi: dw-mmio: Use helper function devm_clk_get_*()

[Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>]

On Wed, 23 Aug 2023 17:20:12 +0300
Serge Semin <fancer.lancer@xxxxxxxxx> wrote:

> On Wed, Aug 23, 2023 at 09:39:25PM +0800, Li Zetao wrote:
> > Since commit 7ef9651e9792 ("clk: Provide new devm_clk helpers for prepared
> > and enabled clocks"), devm_clk_get() and clk_prepare_enable() can now be
> > replaced by devm_clk_get_enabled() when driver enables (and possibly
> > prepares) the clocks for the whole lifetime of the device. Moreover, it is
> > no longer necessary to unprepare and disable the clocks explicitly. Also,
> > devm_clk_get_optional() and clk_prepare_enable() can now be replaced by
> > devm_clk_get_optional_enabled(). Moreover, the lable "out_clk" no longer
> > makes sense, rename it to "out_reset".
> > 
> > Signed-off-by: Li Zetao <lizetao1@xxxxxxxxxx>
> > ---
> > v1 -> v2: Return directly instead of calling reset_control_deassert()
> > before the reset control handler has been requested. And use the
> > "out_reset" label instead of "out" before calling pm_runtime_enable().  
> 
> LGTM. Thanks!
> Acked-by: Serge Semin <fancer.lancer@xxxxxxxxx>
Agreed - looks much better now.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

> 
> -Serge(y)
> 
> > 
> >  drivers/spi/spi-dw-mmio.c | 31 +++++++++----------------------
> >  1 file changed, 9 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
> > index 805264c9c65c..46801189a651 100644
> > --- a/drivers/spi/spi-dw-mmio.c
> > +++ b/drivers/spi/spi-dw-mmio.c
> > @@ -340,29 +340,20 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
> >  	if (dws->irq < 0)
> >  		return dws->irq; /* -ENXIO */
> >  
> > -	dwsmmio->clk = devm_clk_get(&pdev->dev, NULL);
> > +	dwsmmio->clk = devm_clk_get_enabled(&pdev->dev, NULL);
> >  	if (IS_ERR(dwsmmio->clk))
> >  		return PTR_ERR(dwsmmio->clk);
> > -	ret = clk_prepare_enable(dwsmmio->clk);
> > -	if (ret)
> > -		return ret;
> >  
> >  	/* Optional clock needed to access the registers */
> > -	dwsmmio->pclk = devm_clk_get_optional(&pdev->dev, "pclk");
> > -	if (IS_ERR(dwsmmio->pclk)) {
> > -		ret = PTR_ERR(dwsmmio->pclk);
> > -		goto out_clk;
> > -	}
> > -	ret = clk_prepare_enable(dwsmmio->pclk);
> > -	if (ret)
> > -		goto out_clk;
> > +	dwsmmio->pclk = devm_clk_get_optional_enabled(&pdev->dev, "pclk");
> > +	if (IS_ERR(dwsmmio->pclk))
> > +		return PTR_ERR(dwsmmio->pclk);
> >  
> >  	/* find an optional reset controller */
> >  	dwsmmio->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, "spi");
> > -	if (IS_ERR(dwsmmio->rstc)) {
> > -		ret = PTR_ERR(dwsmmio->rstc);
> > -		goto out_clk;
> > -	}
> > +	if (IS_ERR(dwsmmio->rstc))
> > +		return PTR_ERR(dwsmmio->rstc);
> > +
> >  	reset_control_deassert(dwsmmio->rstc);
> >  
> >  	dws->bus_num = pdev->id;
> > @@ -383,7 +374,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
> >  	if (init_func) {
> >  		ret = init_func(pdev, dwsmmio);
> >  		if (ret)
> > -			goto out;
> > +			goto out_reset;
> >  	}
> >  
> >  	pm_runtime_enable(&pdev->dev);
> > @@ -397,9 +388,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
> >  
> >  out:
> >  	pm_runtime_disable(&pdev->dev);
> > -	clk_disable_unprepare(dwsmmio->pclk);
> > -out_clk:
> > -	clk_disable_unprepare(dwsmmio->clk);
> > +out_reset:
> >  	reset_control_assert(dwsmmio->rstc);
> >  
> >  	return ret;
> > @@ -411,8 +400,6 @@ static void dw_spi_mmio_remove(struct platform_device *pdev)
> >  
> >  	dw_spi_remove_host(&dwsmmio->dws);
> >  	pm_runtime_disable(&pdev->dev);
> > -	clk_disable_unprepare(dwsmmio->pclk);
> > -	clk_disable_unprepare(dwsmmio->clk);
> >  	reset_control_assert(dwsmmio->rstc);
> >  }
> >  
> > -- 
> > 2.34.1
> >   
> 
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