linux-kernel - [PATCH v3 7/7] watchdog: coh901327: make use of timeout-secs provided in devicetree

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Date:   Sun, 11 Feb 2018 21:08:47 +0100
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Carlo Caione <carlo@...one.org>,
        Kevin Hilman <khilman@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Barry Song <baohua@...nel.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:     linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        Marcus Folkesson <marcus.folkesson@...il.com>
Subject: [PATCH v3 7/7] watchdog: coh901327: make use of timeout-secs provided in devicetree

watchdog_init_timeout() will allways pick timeout_param since it
defaults to a valid timeout.

Following best practice described in
Documentation/watchdog/watchdog-kernel-api.txt to make use of
the parameter logic.

Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---

Notes:
    v3:
    	- Reformat and use coh901327_wdt.timeout instead of margin when print out
    	  timout in probe function.
    
    v2:
    	- Set .timeout in coh901327_wdt structure declaration.
    	- Set .min_timeout to 1 instead of 0. I could not find a datasheet
    	  for coh901327, so I'm not sure if 0 is valid. However, 0 seems
    	  wrong to me and most driver has 1 as min value. If it should
    	  be 0, please let me know and I have to set another initial
    	  value for margin.

 drivers/watchdog/coh901327_wdt.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/watchdog/coh901327_wdt.c b/drivers/watchdog/coh901327_wdt.c
index 4410337f4f7f..500af8a7ec5a 100644
--- a/drivers/watchdog/coh901327_wdt.c
+++ b/drivers/watchdog/coh901327_wdt.c
@@ -67,7 +67,9 @@
 #define U300_WDOG_IFR_WILL_BARK_IRQ_FORCE_ENABLE			0x0001U
 
 /* Default timeout in seconds = 1 minute */
-static unsigned int margin = 60;
+#define U300_WDOG_DEFAULT_TIMEOUT					60
+
+static unsigned int margin;
 static int irq;
 static void __iomem *virtbase;
 static struct device *parent;
@@ -235,8 +237,9 @@ static struct watchdog_device coh901327_wdt = {
 	 * timeout register is max
 	 * 0x7FFF = 327670ms ~= 327s.
 	 */
-	.min_timeout = 0,
+	.min_timeout = 1,
 	.max_timeout = 327,
+	.timeout = U300_WDOG_DEFAULT_TIMEOUT,
 };
 
 static int __exit coh901327_remove(struct platform_device *pdev)
@@ -315,16 +318,15 @@ static int __init coh901327_probe(struct platform_device *pdev)
 		goto out_no_irq;
 	}
 
-	ret = watchdog_init_timeout(&coh901327_wdt, margin, dev);
-	if (ret < 0)
-		coh901327_wdt.timeout = 60;
+	watchdog_init_timeout(&coh901327_wdt, margin, dev);
 
 	coh901327_wdt.parent = dev;
 	ret = watchdog_register_device(&coh901327_wdt);
 	if (ret)
 		goto out_no_wdog;
 
-	dev_info(dev, "initialized. timer margin=%d sec\n", margin);
+	dev_info(dev, "initialized. (timeout=%d sec)\n",
+			coh901327_wdt.timeout);
 	return 0;
 
 out_no_wdog:
-- 
2.15.1