[PATCH v7 2/2] power: supply: twl4030-charger: add deferred probing for phy and iio

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




This fixes an issue if both this twl4030_charger driver and
phy-twl4030-usb are compiled as modules and loaded in random order.

It has been observed on GTA04 and OpenPandora devices that in worst
case the boot process hangs and in best case the AC detection fails
with a warning.

Therefore we add deferred probing checks for the usb_phy and the
iio channel for AC detection.

Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
---
 drivers/power/supply/twl4030_charger.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
index 9d974f1e3957..0d2125e4f735 100644
--- a/drivers/power/supply/twl4030_charger.c
+++ b/drivers/power/supply/twl4030_charger.c
@@ -989,8 +989,12 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 
 	bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac");
 	if (IS_ERR(bci->channel_vac)) {
+		ret = PTR_ERR(bci->channel_vac);
+		if (ret == -EPROBE_DEFER)
+			return ret;	/* iio not ready */
+		dev_warn(&pdev->dev, "could not request vac iio channel (%d)",
+			ret);
 		bci->channel_vac = NULL;
-		dev_warn(&pdev->dev, "could not request vac iio channel");
 	}
 
 	if (bci->dev->of_node) {
@@ -1002,6 +1006,14 @@ static int twl4030_bci_probe(struct platform_device *pdev)
 			bci->transceiver = devm_usb_get_phy_by_node(
 				bci->dev, phynode, &bci->usb_nb);
 			bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
+			if (IS_ERR(bci->transceiver)) {
+				ret = PTR_ERR(bci->transceiver);
+				if (ret == -EPROBE_DEFER)
+					return ret;	/* phy not ready */
+				dev_warn(&pdev->dev, "could not request transceiver (%d)",
+					ret);
+				bci->transceiver = NULL;
+			}
 		}
 	}
 
-- 
2.12.2

--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux