From: "Jonathan Neuschäfer" <j.neuschaefer@gmx.net>
To: linux-clk@vger.kernel.org, openbmc@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org,
devicetree@vger.kernel.org,
"Jonathan Neuschäfer" <j.neuschaefer@gmx.net>,
"Michael Turquette" <mturquette@baylibre.com>,
"Stephen Boyd" <sboyd@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Avi Fishman" <avifishman70@gmail.com>,
"Tomer Maimon" <tmaimon77@gmail.com>,
"Tali Perry" <tali.perry1@gmail.com>,
"Patrick Venture" <venture@google.com>,
"Nancy Yuen" <yuenn@google.com>,
"Benjamin Fair" <benjaminfair@google.com>,
"Daniel Lezcano" <daniel.lezcano@linaro.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Philipp Zabel" <p.zabel@pengutronix.de>,
"Wim Van Sebroeck" <wim@linux-watchdog.org>,
"Guenter Roeck" <linux@roeck-us.net>
Subject: [PATCH v2 3/7] watchdog: npcm: Enable clock if provided
Date: Fri, 29 Apr 2022 19:20:26 +0200 [thread overview]
Message-ID: <20220429172030.398011-4-j.neuschaefer@gmx.net> (raw)
In-Reply-To: <20220429172030.398011-1-j.neuschaefer@gmx.net>
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(+)
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
next prev parent reply other threads:[~2022-04-29 17:21 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-29 17:20 [PATCH v2 0/7] Nuvoton WPCM450 clock and reset driver Jonathan Neuschäfer
2022-04-29 17:20 ` [PATCH v2 1/7] dt-bindings: timer: nuvoton,npcm7xx-timer: Allow specifying all clocks Jonathan Neuschäfer
2022-05-04 20:34 ` Rob Herring
2022-04-29 17:20 ` [PATCH v2 2/7] clocksource: timer-npcm7xx: Enable timer 1 clock before use Jonathan Neuschäfer
2022-04-29 17:20 ` Jonathan Neuschäfer [this message]
2022-04-29 17:42 ` [PATCH v2 3/7] watchdog: npcm: Enable clock if provided Guenter Roeck
2022-04-29 17:20 ` [PATCH v2 4/7] dt-bindings: clock: Add Nuvoton WPCM450 clock/reset controller Jonathan Neuschäfer
2022-05-01 8:55 ` Krzysztof Kozlowski
2022-05-02 15:04 ` Jonathan Neuschäfer
2022-04-29 17:20 ` [PATCH v2 5/7] ARM: dts: wpcm450: Add clock controller node Jonathan Neuschäfer
2022-04-29 17:20 ` [PATCH v2 6/7] clk: wpcm450: Add Nuvoton WPCM450 clock/reset controller driver Jonathan Neuschäfer
2022-04-29 17:20 ` [PATCH v2 7/7] ARM: dts: wpcm450: Switch clocks to clock controller Jonathan Neuschäfer
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