diff mbox

[2/2] twl4030_charger: find associated phy by more reliable means.

Message ID 20150224040129.32252.59874.stgit@notabene.brown (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

NeilBrown Feb. 24, 2015, 4:01 a.m. UTC 
twl4030_charger currently finds the associated phy
using usb_get_phy() which will return the first USB2 phy.
If your platform has multiple such phys (as mine does),
this is not reliable (and reliably fails on the GTA04).

Change to use devm_usb_get_phy_by_node(), having found the
node by looking for an appropriately named sibling in
device-tree.

This makes usb-charging dependent on correct device-tree
configuration.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 drivers/power/twl4030_charger.c |   21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)



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Comments

Sebastian Reichel Feb. 25, 2015, 9:13 p.m. UTC | #1 
Hi Neil,

On Tue, Feb 24, 2015 at 03:01:29PM +1100, NeilBrown wrote:
> twl4030_charger currently finds the associated phy
> using usb_get_phy() which will return the first USB2 phy.
> If your platform has multiple such phys (as mine does),
> this is not reliable (and reliably fails on the GTA04).
> 
> Change to use devm_usb_get_phy_by_node(), having found the
> node by looking for an appropriately named sibling in
> device-tree.
> 
> This makes usb-charging dependent on correct device-tree
> configuration.

The patch looks ok to me, but you should update the DT documentation
in Documentation/devicetree/bindings/power/twl-charger.txt regarding
the sibling dependency.

Apart from that DT binding maintainers should be CC'd.

-- Sebastian
diff mbox

Patch

diff --git a/drivers/power/twl4030_charger.c b/drivers/power/twl4030_charger.c
index d35b83e635b5..4cf5ffbc904a 100644
--- a/drivers/power/twl4030_charger.c
+++ b/drivers/power/twl4030_charger.c
@@ -629,10 +629,15 @@  static int __init twl4030_bci_probe(struct platform_device *pdev)
 
 	INIT_WORK(&bci->work, twl4030_bci_usb_work);
 
-	bci->transceiver = usb_get_phy(USB_PHY_TYPE_USB2);
-	if (!IS_ERR_OR_NULL(bci->transceiver)) {
-		bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
-		usb_register_notifier(bci->transceiver, &bci->usb_nb);
+	bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
+	if (bci->dev->of_node) {
+		struct device_node *phynode;
+
+		phynode = of_get_child_by_name(bci->dev->of_node->parent,
+					       "twl4030-usb");
+		if (phynode)
+			bci->transceiver = devm_usb_get_phy_by_node(
+				bci->dev, phynode, &bci->usb_nb);
 	}
 
 	/* Enable interrupts now. */
@@ -662,10 +667,6 @@  static int __init twl4030_bci_probe(struct platform_device *pdev)
 	return 0;
 
 fail_unmask_interrupts:
-	if (!IS_ERR_OR_NULL(bci->transceiver)) {
-		usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
-		usb_put_phy(bci->transceiver);
-	}
 	free_irq(bci->irq_bci, bci);
 fail_bci_irq:
 	free_irq(bci->irq_chg, bci);
@@ -694,10 +695,6 @@  static int __exit twl4030_bci_remove(struct platform_device *pdev)
 	twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
 			 TWL4030_INTERRUPTS_BCIIMR2A);
 
-	if (!IS_ERR_OR_NULL(bci->transceiver)) {
-		usb_unregister_notifier(bci->transceiver, &bci->usb_nb);
-		usb_put_phy(bci->transceiver);
-	}
 	free_irq(bci->irq_bci, bci);
 	free_irq(bci->irq_chg, bci);
 	power_supply_unregister(&bci->usb);