Re: [PATCH 2/7] usb: dwc3: adapt dwc3 core to use Generic PHY Framework

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On Thursday 12 September 2013 06:49 PM, Roger Quadros wrote:
On 09/02/2013 06:43 PM, Kishon Vijay Abraham I wrote:
Adapted dwc3 core to use the Generic PHY Framework. So for init, exit,
power_on and power_off the following APIs are used phy_init(), phy_exit(),
phy_power_on() and phy_power_off().

However using the old USB phy library wont be removed till the PHYs of all
other SoC's using dwc3 core is adapted to the Generic PHY Framework.

Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
---
  Documentation/devicetree/bindings/usb/dwc3.txt |    6 ++-
  drivers/usb/dwc3/Kconfig                       |    1 +
  drivers/usb/dwc3/core.c                        |   49 ++++++++++++++++++++++++
  drivers/usb/dwc3/core.h                        |    7 ++++
  4 files changed, 61 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index e807635..471366d 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -6,11 +6,13 @@ Required properties:
   - compatible: must be "snps,dwc3"
   - reg : Address and length of the register set for the device
   - interrupts: Interrupts used by the dwc3 controller.
+
+Optional properties:
   - usb-phy : array of phandle for the PHY device.  The first element
     in the array is expected to be a handle to the USB2/HS PHY and
     the second element is expected to be a handle to the USB3/SS PHY
-
-Optional properties:
+ - phys: from the *Generic PHY* bindings
+ - phy-names: from the *Generic PHY* bindings
   - tx-fifo-resize: determines if the FIFO *has* to be reallocated.

  This is usually a subnode to DWC3 glue to which it is connected.
diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index cfc16dd..ad7ce83 100644
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -3,6 +3,7 @@ config USB_DWC3
  	depends on (USB || USB_GADGET) && GENERIC_HARDIRQS && HAS_DMA
  	depends on EXTCON
  	select USB_PHY
+	select GENERIC_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 428c29e..485d365 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -82,6 +82,12 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)

  	usb_phy_init(dwc->usb2_phy);
  	usb_phy_init(dwc->usb3_phy);
+
+	if (dwc->usb2_generic_phy)
+		phy_init(dwc->usb2_generic_phy);
+	if (dwc->usb3_generic_phy)
+		phy_init(dwc->usb3_generic_phy);
+
  	mdelay(100);

  	/* Clear USB3 PHY reset */
@@ -343,6 +349,11 @@ static void dwc3_core_exit(struct dwc3 *dwc)
  {
  	usb_phy_shutdown(dwc->usb2_phy);
  	usb_phy_shutdown(dwc->usb3_phy);
+
+	if (dwc->usb2_generic_phy)
+		phy_power_off(dwc->usb2_generic_phy);
+	if (dwc->usb3_generic_phy)
+		phy_power_off(dwc->usb3_generic_phy);
  }

  #define DWC3_ALIGN_MASK		(16 - 1)
@@ -427,6 +438,23 @@ static int dwc3_probe(struct platform_device *pdev)
  		dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
  	}

+	if (of_property_read_bool(node, "phys") || pdata->has_phy) {
+		dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
+		if (IS_ERR(dwc->usb2_generic_phy)) {
+			dev_err(dev, "no usb2 phy configured yet");
+			return PTR_ERR(dwc->usb2_generic_phy);
+		}
+
+		dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
+		if (IS_ERR(dwc->usb3_generic_phy)) {
+			dev_err(dev, "no usb3 phy configured yet");
+			return PTR_ERR(dwc->usb3_generic_phy);
+		}
+	} else {
+		dwc->usb2_generic_phy = NULL;
+		dwc->usb3_generic_phy = NULL;
+	}
+
  	/* default to superspeed if no maximum_speed passed */
  	if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
  		dwc->maximum_speed = USB_SPEED_SUPER;
@@ -450,6 +478,11 @@ static int dwc3_probe(struct platform_device *pdev)
  	usb_phy_set_suspend(dwc->usb2_phy, 0);
  	usb_phy_set_suspend(dwc->usb3_phy, 0);

+	if (dwc->usb2_generic_phy)
+		phy_power_on(dwc->usb2_generic_phy);
+	if (dwc->usb3_generic_phy)
+		phy_power_on(dwc->usb3_generic_phy);
+
  	spin_lock_init(&dwc->lock);
  	platform_set_drvdata(pdev, dwc);

@@ -576,6 +609,11 @@ static int dwc3_remove(struct platform_device *pdev)
  	usb_phy_set_suspend(dwc->usb2_phy, 1);
  	usb_phy_set_suspend(dwc->usb3_phy, 1);

+	if (dwc->usb2_generic_phy)

if (IS_ERR())

I assign NULL to usb2_generic_phy and usb3_generic_phy in case the dts entry doesn't have a *phys* property. The IS_ERR of usb2_generic_phy is treated as an error condition and probe will fail.

+		phy_power_off(dwc->usb2_generic_phy);
+	if (dwc->usb3_generic_phy)

if (IS_ERR())

here and everywhere else in this patch.

+		phy_power_off(dwc->usb3_generic_phy);
+
  	pm_runtime_put(&pdev->dev);
  	pm_runtime_disable(&pdev->dev);

@@ -673,6 +711,11 @@ static int dwc3_suspend(struct device *dev)
  	usb_phy_shutdown(dwc->usb3_phy);
  	usb_phy_shutdown(dwc->usb2_phy);

+	if (dwc->usb2_generic_phy)
+		phy_exit(dwc->usb2_generic_phy);
+	if (dwc->usb3_generic_phy)
+		phy_exit(dwc->usb3_generic_phy);
+
  	return 0;
  }

@@ -683,6 +726,12 @@ static int dwc3_resume(struct device *dev)

  	usb_phy_init(dwc->usb3_phy);
  	usb_phy_init(dwc->usb2_phy);
+
+	if (dwc->usb2_generic_phy)
+		phy_init(dwc->usb2_generic_phy);
+	if (dwc->usb3_generic_phy)
+		phy_init(dwc->usb3_generic_phy);
+
  	msleep(100);

  	spin_lock_irqsave(&dwc->lock, flags);
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index f8af8d4..01ec7d7 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -31,6 +31,8 @@
  #include <linux/usb/gadget.h>
  #include <linux/usb/otg.h>

+#include <linux/phy/phy.h>
+
  /* Global constants */
  #define DWC3_EP0_BOUNCE_SIZE	512
  #define DWC3_ENDPOINTS_NUM	32
@@ -613,6 +615,8 @@ struct dwc3_scratchpad_array {
   * @dr_mode: requested mode of operation
   * @usb2_phy: pointer to USB2 PHY
   * @usb3_phy: pointer to USB3 PHY
+ * @usb2_generic_phy: pointer to USB2 PHY
+ * @usb3_generic_phy: pointer to USB3 PHY

Why duplicate usbX_phy and usbX_generic_phy? Can't we just have one
for each type and call it usbX_phy?

There was an already existing phy library in usb which usesusb_phy. There might still be users using the existing usb phy library. Until all the users have completely migrated to the generic PHY framework, this would co-exist.

Thanks
Kishon
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