linux-kernel - [PATCH v1 10/11] watchdog: bd9576_wdt: switch to using devm_fwnode_gpiod

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Date:   Sun,  4 Sep 2022 23:31:02 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matti Vaittinen <mazziesaccount@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Felipe Balbi <balbi@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Marc Zyngier <maz@...nel.org>,
        Richard Weinberger <richard@....at>,
        David Airlie <airlied@...ux.ie>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Rob Herring <robh@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Pali Rohár <pali@...nel.org>
Cc:     linux-watchdog@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v1 10/11] watchdog: bd9576_wdt: switch to using devm_fwnode_gpiod_get()

I would like to stop exporting OF-specific devm_gpiod_get_from_of_node()
so that gpiolib can be cleaned a bit, so let's switch to the generic
fwnode property API.

While at it switch the rest of the calls to read properties in
bd9576_wdt_probe() to the generic device property API as well.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

diff --git a/drivers/watchdog/bd9576_wdt.c b/drivers/watchdog/bd9576_wdt.c
index 0b6999f3b6e8..4a20e07fbb69 100644
--- a/drivers/watchdog/bd9576_wdt.c
+++ b/drivers/watchdog/bd9576_wdt.c
@@ -9,8 +9,8 @@
 #include <linux/gpio/consumer.h>
 #include <linux/mfd/rohm-bd957x.h>
 #include <linux/module.h>
-#include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/watchdog.h>
 
@@ -202,10 +202,10 @@ static int bd957x_set_wdt_mode(struct bd9576_wdt_priv *priv, int hw_margin,
 static int bd9576_wdt_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->parent->of_node;
 	struct bd9576_wdt_priv *priv;
 	u32 hw_margin[2];
 	u32 hw_margin_max = BD957X_WDT_DEFAULT_MARGIN, hw_margin_min = 0;
+	int count;
 	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -221,40 +221,51 @@ static int bd9576_wdt_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	priv->gpiod_en = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
-						     "rohm,watchdog-enable-gpios",
-						     0, GPIOD_OUT_LOW,
-						     "watchdog-enable");
+	priv->gpiod_en = devm_fwnode_gpiod_get(dev, dev_fwnode(dev->parent),
+					       "rohm,watchdog-enable",
+					       GPIOD_OUT_LOW,
+					       "watchdog-enable");
 	if (IS_ERR(priv->gpiod_en))
 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_en),
 			      "getting watchdog-enable GPIO failed\n");
 
-	priv->gpiod_ping = devm_gpiod_get_from_of_node(dev, dev->parent->of_node,
-						     "rohm,watchdog-ping-gpios",
-						     0, GPIOD_OUT_LOW,
-						     "watchdog-ping");
+	priv->gpiod_ping = devm_fwnode_gpiod_get(dev, dev_fwnode(dev->parent),
+						 "rohm,watchdog-ping",
+						 GPIOD_OUT_LOW,
+						 "watchdog-ping");
 	if (IS_ERR(priv->gpiod_ping))
 		return dev_err_probe(dev, PTR_ERR(priv->gpiod_ping),
 				     "getting watchdog-ping GPIO failed\n");
 
-	ret = of_property_read_variable_u32_array(np, "rohm,hw-timeout-ms",
-						  &hw_margin[0], 1, 2);
-	if (ret < 0 && ret != -EINVAL)
-		return ret;
+	count = device_property_count_u32(dev->parent, "rohm,hw-timeout-ms");
+	if (count < 0 && count != -EINVAL)
+		return count;
+
+	if (count > 0) {
+		if (count > ARRAY_SIZE(hw_margin))
+			return -EINVAL;
 
-	if (ret == 1)
-		hw_margin_max = hw_margin[0];
+		ret = device_property_read_u32_array(dev->parent,
+						     "rohm,hw-timeout-ms",
+						     hw_margin, count);
+		if (ret < 0)
+			return ret;
 
-	if (ret == 2) {
-		hw_margin_max = hw_margin[1];
-		hw_margin_min = hw_margin[0];
+		if (count == 1)
+			hw_margin_max = hw_margin[0];
+
+		if (count == 2) {
+			hw_margin_max = hw_margin[1];
+			hw_margin_min = hw_margin[0];
+		}
 	}
 
 	ret = bd957x_set_wdt_mode(priv, hw_margin_max, hw_margin_min);
 	if (ret)
 		return ret;
 
-	priv->always_running = of_property_read_bool(np, "always-running");
+	priv->always_running = device_property_read_bool(dev->parent,
+							 "always-running");
 
 	watchdog_set_drvdata(&priv->wdd, priv);
 

-- 
b4 0.10.0-dev-fc921