linux-kernel - [PATCH v5 1/6] usb: dwc3: core: support optional PHYs

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Date:	Mon, 3 Mar 2014 17:08:10 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<bcousson@...libre.com>, <balbi@...com>,
	<devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <george.cherian@...com>,
	<heikki.krogerus@...ux.intel.com>, <rogerq@...com>
CC:	<rob.herring@...xeda.com>, <pawel.moll@....com>,
	<mark.rutland@....com>, <swarren@...dotorg.org>,
	<ijc+devicetree@...lion.org.uk>, <rob@...dley.net>,
	<tony@...mide.com>, <linux@....linux.org.uk>, <kishon@...com>,
	<gregkh@...uxfoundation.org>, <grant.likely@...aro.org>,
	<s.nawrocki@...sung.com>, <galak@...eaurora.org>
Subject: [PATCH v5 1/6] usb: dwc3: core: support optional PHYs

Since PHYs for dwc3 is optional (not all SoCs having PHYs for DWC3
should be programmed), do not return from probe if the USB PHY library
returns -ENODEV as that indicates the platform does not have a
programmable PHY.

While this can be considered as a temporary fix, a long term solution
would be to add 'nop' PHY for platforms that does not have programmable
PHY.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Reviewed-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/dwc3/core.c |   34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 7d0cb34..225a4d6 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -529,32 +529,26 @@ static int dwc3_probe(struct platform_device *pdev)
 
 	if (IS_ERR(dwc->usb2_phy)) {
 		ret = PTR_ERR(dwc->usb2_phy);
-
-		/*
-		 * if -ENXIO is returned, it means PHY layer wasn't
-		 * enabled, so it makes no sense to return -EPROBE_DEFER
-		 * in that case, since no PHY driver will ever probe.
-		 */
-		if (ret == -ENXIO)
+		if (ret == -ENXIO || ret == -ENODEV) {
+			dwc->usb2_phy = NULL;
+		} else if (ret == -EPROBE_DEFER) {
 			return ret;
-
-		dev_err(dev, "no usb2 phy configured\n");
-		return -EPROBE_DEFER;
+		} else {
+			dev_err(dev, "no usb2 phy configured\n");
+			return ret;
+		}
 	}
 
 	if (IS_ERR(dwc->usb3_phy)) {
 		ret = PTR_ERR(dwc->usb3_phy);
-
-		/*
-		 * if -ENXIO is returned, it means PHY layer wasn't
-		 * enabled, so it makes no sense to return -EPROBE_DEFER
-		 * in that case, since no PHY driver will ever probe.
-		 */
-		if (ret == -ENXIO)
+		if (ret == -ENXIO || ret == -ENODEV) {
+			dwc->usb3_phy = NULL;
+		} else if (ret == -EPROBE_DEFER) {
 			return ret;
-
-		dev_err(dev, "no usb3 phy configured\n");
-		return -EPROBE_DEFER;
+		} else {
+			dev_err(dev, "no usb3 phy configured\n");
+			return ret;
+		}
 	}
 
 	dwc->xhci_resources[0].start = res->start;
-- 
1.7.9.5

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