Re: [PATCH -next v2 11/25] spi: dw-bt1: Use helper function devm_clk_get_enabled()

On Wed, 23 Aug 2023 17:35:35 +0300
Serge Semin [off-list ref] wrote:

On Wed, Aug 23, 2023 at 09:39:24PM +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.
  

quoted

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Serge Semin <redacted>
Signed-off-by: Li Zetao <redacted>  

Just for the record, the tags order is normally supposed to reflect a
patch route. Even though AFAICS it's explicitly defined for the Sob
tags only (see Documentation/process/submitting-patches.rst), but
almost all kernel developers apply that rule to all the tags. See the
kernel git log as the brightest example. So your Sob tag should have
been kept first, then either my Ab or Jonathan' Rb tags.

There have been far too many discussions about this over the years.
There is an argument (I'm not saying I agree with it) that tags given
on an earlier version than the one posted should be before the SoB of
the author on basis that the SoB is occurring later (as it's on the new
version).  That is a slightly stronger argument if there are changes
to the patch, but then things get inconsistent between patches with minor
changes and those without. *sigh*

So this pattern is fairly common if a bit weird in my view :)

Jonathan

-Serge(y)

quoted

---
v1 -> v2: None

 drivers/spi/spi-dw-bt1.c | 23 +++++------------------
 1 file changed, 5 insertions(+), 18 deletions(-)

diff --git a/drivers/spi/spi-dw-bt1.c b/drivers/spi/spi-dw-bt1.c
index 5e1c01822967..5391bcac305c 100644
--- a/drivers/spi/spi-dw-bt1.c
+++ b/drivers/spi/spi-dw-bt1.c

@@ -269,43 +269,32 @@ static int dw_spi_bt1_probe(struct platform_device *pdev)
 
 	dws->paddr = mem->start;
 
-	dwsbt1->clk = devm_clk_get(&pdev->dev, NULL);
+	dwsbt1->clk = devm_clk_get_enabled(&pdev->dev, NULL);
 	if (IS_ERR(dwsbt1->clk))
 		return PTR_ERR(dwsbt1->clk);
 
-	ret = clk_prepare_enable(dwsbt1->clk);
-	if (ret)
-		return ret;
-
 	dws->bus_num = pdev->id;
 	dws->reg_io_width = 4;
 	dws->max_freq = clk_get_rate(dwsbt1->clk);
-	if (!dws->max_freq) {
-		ret = -EINVAL;
-		goto err_disable_clk;
-	}
+	if (!dws->max_freq)
+		return -EINVAL;
 
 	init_func = device_get_match_data(&pdev->dev);
 	ret = init_func(pdev, dwsbt1);
 	if (ret)
-		goto err_disable_clk;
+		return ret;
 
 	pm_runtime_enable(&pdev->dev);
 
 	ret = dw_spi_add_host(&pdev->dev, dws);
 	if (ret) {
 		pm_runtime_disable(&pdev->dev);
-		goto err_disable_clk;
+		return ret;
 	}
 
 	platform_set_drvdata(pdev, dwsbt1);
 
 	return 0;
-
-err_disable_clk:
-	clk_disable_unprepare(dwsbt1->clk);
-
-	return ret;
 }
 
 static void dw_spi_bt1_remove(struct platform_device *pdev)

@@ -315,8 +304,6 @@ static void dw_spi_bt1_remove(struct platform_device *pdev)
 	dw_spi_remove_host(&dwsbt1->dws);
 
 	pm_runtime_disable(&pdev->dev);
-
-	clk_disable_unprepare(dwsbt1->clk);
 }
 
 static const struct of_device_id dw_spi_bt1_of_match[] = {

-- 
2.34.1
  

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