linux-kernel - [PATCH v2 1/3] drivers:power:twl4030-charger: fix problem with EPROBE

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Message-Id: <701c4f311e81dab4b3218cfe03bb9faa2da37747.1446463653.git.hns@goldelico.com>
Date:	Mon,  2 Nov 2015 12:27:34 +0100
From:	"H. Nikolaus Schaller" <hns@...delico.com>
To:	Gražvydas Ignotas <notasas@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Andreas Kemnade <andreas@...nade.info>
Cc:	linux-pm@...r.kernel.org, gta04-owner@...delico.com,
	linux-kernel@...r.kernel.org,
	"H. Nikolaus Schaller" <hns@...delico.com>
Subject: [PATCH v2 1/3] drivers:power:twl4030-charger: fix problem with EPROBE_DEFER

If the phy-twol4030-usb driver is compiled as a module,
devm_usb_get_phy_by_node() may return -EPROBE_DEFER in which
case we should also defer probing of the twl4030 charger instead of
turning USB charging off (forever or until next reboot) further down in
code.

Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 drivers/power/twl4030_charger.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index 74f2d3f..00697e9 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -1057,9 +1057,13 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 
 		phynode = of_find_compatible_node(bci->dev->of_node->parent,
 						  NULL, "ti,twl4030-usb");
-		if (phynode)
+		if (phynode) {
 			bci->transceiver = devm_usb_get_phy_by_node(
 				bci->dev, phynode, &bci->usb_nb);
+			if (IS_ERR(bci->transceiver) &&
+			    PTR_ERR(bci->transceiver) == -EPROBE_DEFER)
+				return -EPROBE_DEFER;	/* PHY not ready */
+		}
 	}
 
 	/* Enable interrupts now. */
-- 
2.5.1

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