linux-kernel - [PATCH v2] phy: phy-sun4i-usb: Add log when probing

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Date:   Tue, 29 Nov 2016 18:22:11 +0100
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     kishon@...com, maxime.ripard@...e-electrons.com, wens@...e.org
Cc:     Quentin Schulz <quentin.schulz@...e-electrons.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        thomas.petazzoni@...e-electrons.com
Subject: [PATCH v2] phy: phy-sun4i-usb: Add log when probing

When phy-sun4i-usb's probing fails, it does not print the reason in
kernel log, forcing the developer to edit this driver to add info logs.
This commit makes the kernel print the reason of phy-sun4i-usb's probing
failure or a success message.

Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
---
Sorry for the delay, I completely forgot to send a v2.

v2:
 - removing (from v1) debug message when devm_ioremap_resource fails,
 - changing dev_info to dev_dbg when driver is successfully loaded,

 drivers/phy/phy-sun4i-usb.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index fec34f5..f1b2848 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -632,19 +632,25 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 
 	data->id_det_gpio = devm_gpiod_get_optional(dev, "usb0_id_det",
 						    GPIOD_IN);
-	if (IS_ERR(data->id_det_gpio))
+	if (IS_ERR(data->id_det_gpio)) {
+		dev_err(dev, "Couldn't request ID GPIO\n");
 		return PTR_ERR(data->id_det_gpio);
+	}
 
 	data->vbus_det_gpio = devm_gpiod_get_optional(dev, "usb0_vbus_det",
 						      GPIOD_IN);
-	if (IS_ERR(data->vbus_det_gpio))
+	if (IS_ERR(data->vbus_det_gpio)) {
+		dev_err(dev, "Couldn't request VBUS detect GPIO\n");
 		return PTR_ERR(data->vbus_det_gpio);
+	}
 
 	if (of_find_property(np, "usb0_vbus_power-supply", NULL)) {
 		data->vbus_power_supply = devm_power_supply_get_by_phandle(dev,
 						     "usb0_vbus_power-supply");
-		if (IS_ERR(data->vbus_power_supply))
+		if (IS_ERR(data->vbus_power_supply)) {
+			dev_err(dev, "Couldn't get the VBUS power supply\n");
 			return PTR_ERR(data->vbus_power_supply);
+		}
 
 		if (!data->vbus_power_supply)
 			return -EPROBE_DEFER;
@@ -653,8 +659,10 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 	data->dr_mode = of_usb_get_dr_mode_by_phy(np, 0);
 
 	data->extcon = devm_extcon_dev_allocate(dev, sun4i_usb_phy0_cable);
-	if (IS_ERR(data->extcon))
+	if (IS_ERR(data->extcon)) {
+		dev_err(dev, "Couldn't allocate our extcon device\n");
 		return PTR_ERR(data->extcon);
+	}
 
 	ret = devm_extcon_dev_register(dev, data->extcon);
 	if (ret) {
@@ -669,8 +677,13 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 		snprintf(name, sizeof(name), "usb%d_vbus", i);
 		phy->vbus = devm_regulator_get_optional(dev, name);
 		if (IS_ERR(phy->vbus)) {
-			if (PTR_ERR(phy->vbus) == -EPROBE_DEFER)
+			if (PTR_ERR(phy->vbus) == -EPROBE_DEFER) {
+				dev_err(dev,
+					"Couldn't get regulator %s... Deferring probe\n",
+					name);
 				return -EPROBE_DEFER;
+			}
+
 			phy->vbus = NULL;
 		}
 
@@ -754,6 +767,8 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 		return PTR_ERR(phy_provider);
 	}
 
+	dev_dbg(dev, "successfully loaded\n");
+
 	return 0;
 }
 
-- 
2.9.3