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

On Wed, 23 Aug 2023 17:20:12 +0300
Serge Semin [off-list ref] wrote:

On Wed, Aug 23, 2023 at 09:39:25PM +0800, Li Zetao wrote:

quoted

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 <redacted>
---
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 <redacted>

Agreed - looks much better now.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

-Serge(y)

quoted

 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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