| Message ID | 20220429172030.398011-4-j.neuschaefer@gmx.net |
|---|---|
| State | New |
| Headers | show |
| Series | Nuvoton WPCM450 clock and reset driver | expand |
On 4/29/22 10:20, Jonathan Neuschäfer wrote: > On the Nuvoton WPCM450 SoC, with its upcoming clock driver, peripheral > clocks are individually gated and ungated. Therefore, the watchdog > driver must be able to ungate the watchdog clock. > > Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Acked-by: Guenter Roeck <linux@roeck-us.net> > --- > > v2: > - Add clk_disable_unprepare call, suggested by Guenter Roeck > > v1: > - https://lore.kernel.org/lkml/20220422183012.444674-4-j.neuschaefer@gmx.net/ > --- > drivers/watchdog/npcm_wdt.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c > index 28a24caa2627c..ee08d9805f966 100644 > --- a/drivers/watchdog/npcm_wdt.c > +++ b/drivers/watchdog/npcm_wdt.c > @@ -3,6 +3,7 @@ > // Copyright (c) 2018 IBM Corp. > > #include <linux/bitops.h> > +#include <linux/clk.h> > #include <linux/delay.h> > #include <linux/interrupt.h> > #include <linux/kernel.h> > @@ -43,6 +44,7 @@ > struct npcm_wdt { > struct watchdog_device wdd; > void __iomem *reg; > + struct clk *clk; > }; > > static inline struct npcm_wdt *to_npcm_wdt(struct watchdog_device *wdd) > @@ -66,6 +68,9 @@ static int npcm_wdt_start(struct watchdog_device *wdd) > struct npcm_wdt *wdt = to_npcm_wdt(wdd); > u32 val; > > + if (wdt->clk) > + clk_prepare_enable(wdt->clk); > + > if (wdd->timeout < 2) > val = 0x800; > else if (wdd->timeout < 3) > @@ -100,6 +105,9 @@ static int npcm_wdt_stop(struct watchdog_device *wdd) > > writel(0, wdt->reg); > > + if (wdt->clk) > + clk_disable_unprepare(wdt->clk); > + > return 0; > } > > @@ -191,6 +199,10 @@ static int npcm_wdt_probe(struct platform_device *pdev) > if (IS_ERR(wdt->reg)) > return PTR_ERR(wdt->reg); > > + wdt->clk = devm_clk_get_optional(&pdev->dev, NULL); > + if (IS_ERR(wdt->clk)) > + return PTR_ERR(wdt->clk); > + > irq = platform_get_irq(pdev, 0); > if (irq < 0) > return irq; > -- > 2.35.1 >
diff --git a/drivers/watchdog/npcm_wdt.c b/drivers/watchdog/npcm_wdt.c index 28a24caa2627c..ee08d9805f966 100644 --- a/drivers/watchdog/npcm_wdt.c +++ b/drivers/watchdog/npcm_wdt.c @@ -3,6 +3,7 @@ // Copyright (c) 2018 IBM Corp. #include <linux/bitops.h> +#include <linux/clk.h> #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/kernel.h> @@ -43,6 +44,7 @@ struct npcm_wdt { struct watchdog_device wdd; void __iomem *reg; + struct clk *clk; }; static inline struct npcm_wdt *to_npcm_wdt(struct watchdog_device *wdd) @@ -66,6 +68,9 @@ static int npcm_wdt_start(struct watchdog_device *wdd) struct npcm_wdt *wdt = to_npcm_wdt(wdd); u32 val; + if (wdt->clk) + clk_prepare_enable(wdt->clk); + if (wdd->timeout < 2) val = 0x800; else if (wdd->timeout < 3) @@ -100,6 +105,9 @@ static int npcm_wdt_stop(struct watchdog_device *wdd) writel(0, wdt->reg); + if (wdt->clk) + clk_disable_unprepare(wdt->clk); + return 0; } @@ -191,6 +199,10 @@ static int npcm_wdt_probe(struct platform_device *pdev) if (IS_ERR(wdt->reg)) return PTR_ERR(wdt->reg); + wdt->clk = devm_clk_get_optional(&pdev->dev, NULL); + if (IS_ERR(wdt->clk)) + return PTR_ERR(wdt->clk); + irq = platform_get_irq(pdev, 0); if (irq < 0) return irq;
On the Nuvoton WPCM450 SoC, with its upcoming clock driver, peripheral clocks are individually gated and ungated. Therefore, the watchdog driver must be able to ungate the watchdog clock. Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> --- v2: - Add clk_disable_unprepare call, suggested by Guenter Roeck v1: - https://lore.kernel.org/lkml/20220422183012.444674-4-j.neuschaefer@gmx.net/ --- drivers/watchdog/npcm_wdt.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) -- 2.35.1