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Message-ID: <1381866857-3861-2-git-send-email-kishon@ti.com>
Date: Wed, 16 Oct 2013 01:24:11 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: <kishon@...com>, <balbi@...com>, <gregkh@...uxfoundation.org>
CC: <rob.herring@...xeda.com>, <pawel.moll@....com>,
<mark.rutland@....com>, <swarren@...dotorg.org>,
<ijc+devicetree@...lion.org.uk>, <rob@...dley.net>,
<bcousson@...libre.com>, <tony@...mide.com>,
<linux@....linux.org.uk>, <grant.likely@...aro.org>,
<s.nawrocki@...sung.com>, <galak@...eaurora.org>,
<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>
Subject: [PATCH v2 1/7] usb: dwc3: get "usb_phy" only if the platform indicates the presence of PHY's
There can be systems which does not have a external usb_phy, so get
usb_phy only if dt data indicates the presence of PHY in the case of dt boot or
if platform_data indicates the presence of PHY. Also remove checking if
return value is -ENXIO since it's now changed to always enable usb_phy layer.
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
In usb_get_phy_by_phandle, index 0 always refers to usb2 phy and index 1 always
refers to usb3 phy. Since we've lived so long with this, this patch will make
an assumption that if only one entry is populated in *usb-phy* property, it will
be usb2 phy and the next entry will be usb3 phy.
drivers/usb/dwc3/Kconfig | 1 +
drivers/usb/dwc3/core.c | 72 ++++++++++++++++++++------------------
drivers/usb/dwc3/platform_data.h | 2 ++
3 files changed, 41 insertions(+), 34 deletions(-)
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index 70fc430..8e385b4 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -1,6 +1,7 @@
config USB_DWC3
tristate "DesignWare USB3 DRD Core Support"
depends on (USB || USB_GADGET) && HAS_DMA
+ select USB_PHY
select USB_XHCI_PLATFORM if USB_SUPPORT && USB_XHCI_HCD
help
Say Y or M here if your system has a Dual Role SuperSpeed
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 474162e..cb91d70 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -354,6 +354,7 @@ static int dwc3_probe(struct platform_device *pdev)
struct device_node *node = dev->of_node;
struct resource *res;
struct dwc3 *dwc;
+ int count;
int ret = -ENOMEM;
@@ -387,16 +388,49 @@ static int dwc3_probe(struct platform_device *pdev)
if (node) {
dwc->maximum_speed = of_usb_get_maximum_speed(node);
- dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
- dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 1);
+ count = of_count_phandle_with_args(node, "usb-phy", NULL);
+ switch (count) {
+ case 2:
+ dwc->usb3_phy = devm_usb_get_phy_by_phandle(dev,
+ "usb-phy", 1);
+ if (IS_ERR(dwc->usb3_phy)) {
+ dev_err(dev, "usb3 phy not found\n");
+ return PTR_ERR(dwc->usb3_phy);
+ }
+ case 1:
+ dwc->usb2_phy = devm_usb_get_phy_by_phandle(dev,
+ "usb-phy", 0);
+ if (IS_ERR(dwc->usb2_phy)) {
+ dev_err(dev, "usb2 phy not found\n");
+ return PTR_ERR(dwc->usb2_phy);
+ }
+ break;
+ default:
+ dev_err(dev, "usb phy nodes not configured\n");
+ }
dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
dwc->dr_mode = of_usb_get_dr_mode(node);
} else if (pdata) {
dwc->maximum_speed = pdata->maximum_speed;
- dwc->usb2_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
- dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
+ if (pdata->usb2_phy) {
+ dwc->usb2_phy = devm_usb_get_phy(dev,
+ USB_PHY_TYPE_USB2);
+ if (IS_ERR(dwc->usb2_phy)) {
+ dev_err(dev, "usb2 phy not found\n");
+ return PTR_ERR(dwc->usb2_phy);
+ }
+ }
+
+ if (pdata->usb3_phy) {
+ dwc->usb3_phy = devm_usb_get_phy(dev,
+ USB_PHY_TYPE_USB3);
+ if (IS_ERR(dwc->usb3_phy)) {
+ dev_err(dev, "usb3 phy not found\n");
+ return PTR_ERR(dwc->usb3_phy);
+ }
+ }
dwc->needs_fifo_resize = pdata->tx_fifo_resize;
dwc->dr_mode = pdata->dr_mode;
@@ -409,36 +443,6 @@ static int dwc3_probe(struct platform_device *pdev)
if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
dwc->maximum_speed = USB_SPEED_SUPER;
- 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)
- return ret;
-
- dev_err(dev, "no usb2 phy configured\n");
- return -EPROBE_DEFER;
- }
-
- 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)
- return ret;
-
- dev_err(dev, "no usb3 phy configured\n");
- return -EPROBE_DEFER;
- }
-
dwc->xhci_resources[0].start = res->start;
dwc->xhci_resources[0].end = dwc->xhci_resources[0].start +
DWC3_XHCI_REGS_END;
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index 7db34f0..49ffa6d 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -24,4 +24,6 @@ struct dwc3_platform_data {
enum usb_device_speed maximum_speed;
enum usb_dr_mode dr_mode;
bool tx_fifo_resize;
+ bool usb2_phy;
+ bool usb3_phy;
};
--
1.7.10.4
--
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