| Message ID | 2b041dc8230a4ed255051bb2d323da8a51a8d0be.1672491445.git.christophe.jaillet@wanadoo.fr |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] watchdog: of_xilinx_wdt: Use devm_clk_get_enabled() helper | expand |
++ On 12/31/22 13:57, Christophe JAILLET wrote: > The devm_clk_get_enabled() helper: > - calls devm_clk_get() > - calls clk_prepare_enable() and registers what is needed in order to > call clk_disable_unprepare() when needed, as a managed resource. > > This simplifies the code and avoids the need of a dedicated function used > with devm_add_action_or_reset(). > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> > --- > V2: remove xwdt_clk_disable_unprepare() as-well > > Note that the order of operations is slightly modified by this patch. The > clk is now prepare_enable()'ed before calling clk_get_rate(). > --- > drivers/watchdog/of_xilinx_wdt.c | 16 +--------------- > 1 file changed, 1 insertion(+), 15 deletions(-) > > diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c > index 3318544366b8..2a079ca04aa3 100644 > --- a/drivers/watchdog/of_xilinx_wdt.c > +++ b/drivers/watchdog/of_xilinx_wdt.c > @@ -154,11 +154,6 @@ static u32 xwdt_selftest(struct xwdt_device *xdev) > return XWT_TIMER_FAILED; > } > > -static void xwdt_clk_disable_unprepare(void *data) > -{ > - clk_disable_unprepare(data); > -} > - > static int xwdt_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > @@ -193,7 +188,7 @@ static int xwdt_probe(struct platform_device *pdev) > > watchdog_set_nowayout(xilinx_wdt_wdd, enable_once); > > - xdev->clk = devm_clk_get(dev, NULL); > + xdev->clk = devm_clk_get_enabled(dev, NULL); > if (IS_ERR(xdev->clk)) { > if (PTR_ERR(xdev->clk) != -ENOENT) > return PTR_ERR(xdev->clk); > @@ -211,15 +206,6 @@ static int xwdt_probe(struct platform_device *pdev) > "The watchdog clock freq cannot be obtained\n"); > } else { > pfreq = clk_get_rate(xdev->clk); > - rc = clk_prepare_enable(xdev->clk); > - if (rc) { > - dev_err(dev, "unable to enable clock\n"); > - return rc; > - } > - rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare, > - xdev->clk); > - if (rc) > - return rc; > } > > /* > -- > 2.34.1 > Srinivas: Please retest but it looks good to me. Acked-by: Michal Simek <michal.simek@amd.com> Thanks, Michal
On Sat, Dec 31, 2022 at 01:57:49PM +0100, Christophe JAILLET wrote: > The devm_clk_get_enabled() helper: > - calls devm_clk_get() > - calls clk_prepare_enable() and registers what is needed in order to > call clk_disable_unprepare() when needed, as a managed resource. > > This simplifies the code and avoids the need of a dedicated function used > with devm_add_action_or_reset(). > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: Guenter Roeck <linux@roeck-us.net> > --- > V2: remove xwdt_clk_disable_unprepare() as-well > > Note that the order of operations is slightly modified by this patch. The > clk is now prepare_enable()'ed before calling clk_get_rate(). > --- > drivers/watchdog/of_xilinx_wdt.c | 16 +--------------- > 1 file changed, 1 insertion(+), 15 deletions(-) > > diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c > index 3318544366b8..2a079ca04aa3 100644 > --- a/drivers/watchdog/of_xilinx_wdt.c > +++ b/drivers/watchdog/of_xilinx_wdt.c > @@ -154,11 +154,6 @@ static u32 xwdt_selftest(struct xwdt_device *xdev) > return XWT_TIMER_FAILED; > } > > -static void xwdt_clk_disable_unprepare(void *data) > -{ > - clk_disable_unprepare(data); > -} > - > static int xwdt_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > @@ -193,7 +188,7 @@ static int xwdt_probe(struct platform_device *pdev) > > watchdog_set_nowayout(xilinx_wdt_wdd, enable_once); > > - xdev->clk = devm_clk_get(dev, NULL); > + xdev->clk = devm_clk_get_enabled(dev, NULL); > if (IS_ERR(xdev->clk)) { > if (PTR_ERR(xdev->clk) != -ENOENT) > return PTR_ERR(xdev->clk); > @@ -211,15 +206,6 @@ static int xwdt_probe(struct platform_device *pdev) > "The watchdog clock freq cannot be obtained\n"); > } else { > pfreq = clk_get_rate(xdev->clk); > - rc = clk_prepare_enable(xdev->clk); > - if (rc) { > - dev_err(dev, "unable to enable clock\n"); > - return rc; > - } > - rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare, > - xdev->clk); > - if (rc) > - return rc; > } > > /* > -- > 2.34.1 >
diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c index 3318544366b8..2a079ca04aa3 100644 --- a/drivers/watchdog/of_xilinx_wdt.c +++ b/drivers/watchdog/of_xilinx_wdt.c @@ -154,11 +154,6 @@ static u32 xwdt_selftest(struct xwdt_device *xdev) return XWT_TIMER_FAILED; } -static void xwdt_clk_disable_unprepare(void *data) -{ - clk_disable_unprepare(data); -} - static int xwdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -193,7 +188,7 @@ static int xwdt_probe(struct platform_device *pdev) watchdog_set_nowayout(xilinx_wdt_wdd, enable_once); - xdev->clk = devm_clk_get(dev, NULL); + xdev->clk = devm_clk_get_enabled(dev, NULL); if (IS_ERR(xdev->clk)) { if (PTR_ERR(xdev->clk) != -ENOENT) return PTR_ERR(xdev->clk); @@ -211,15 +206,6 @@ static int xwdt_probe(struct platform_device *pdev) "The watchdog clock freq cannot be obtained\n"); } else { pfreq = clk_get_rate(xdev->clk); - rc = clk_prepare_enable(xdev->clk); - if (rc) { - dev_err(dev, "unable to enable clock\n"); - return rc; - } - rc = devm_add_action_or_reset(dev, xwdt_clk_disable_unprepare, - xdev->clk); - if (rc) - return rc; } /*
The devm_clk_get_enabled() helper: - calls devm_clk_get() - calls clk_prepare_enable() and registers what is needed in order to call clk_disable_unprepare() when needed, as a managed resource. This simplifies the code and avoids the need of a dedicated function used with devm_add_action_or_reset(). Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- V2: remove xwdt_clk_disable_unprepare() as-well Note that the order of operations is slightly modified by this patch. The clk is now prepare_enable()'ed before calling clk_get_rate(). --- drivers/watchdog/of_xilinx_wdt.c | 16 +--------------- 1 file changed, 1 insertion(+), 15 deletions(-)