[PATCH v4 1/2] usb: host: ehci-exynos: Remove unnecessary usb-phy support

[Vivek Gautam <gautam.vivek@samsung.com>]

Now that we have completely moved from older USB-PHY drivers
to newer GENERIC-PHY drivers for PHYs available with USB controllers
on Exynos series of SoCs, we can remove the support for the same
in our host drivers too.

We also defer the probe for our host in case we end up getting
EPROBE_DEFER error when getting PHYs.

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
---

Changes since v3:
 - Addressed review comments by Alan:
   -- Skipped renaming 'phy_number' variable,
   -- resorted to just adding minimal change required for phy assignment.
   -- updated patch description to mention EPROBE_DEFER support.

 drivers/usb/host/ehci-exynos.c |   74 +++++++++++-----------------------------
 1 file changed, 20 insertions(+), 54 deletions(-)

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index 2eed9a4..f293453 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -21,11 +21,8 @@
 #include <linux/of_gpio.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
-#include <linux/usb/phy.h>
-#include <linux/usb/samsung_usb_phy.h>
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>
-#include <linux/usb/otg.h>
 
 #include "ehci.h"
 
@@ -47,9 +44,7 @@ static struct hc_driver __read_mostly exynos_ehci_hc_driver;
 
 struct exynos_ehci_hcd {
 	struct clk *clk;
-	struct usb_phy *phy;
-	struct usb_otg *otg;
-	struct phy *phy_g[PHY_NUMBER];
+	struct phy *phy[PHY_NUMBER];
 };
 
 #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
@@ -60,8 +55,9 @@ static int exynos_ehci_get_phy(struct device *dev,
 	struct device_node *child;
 	struct phy *phy;
 	int phy_number;
-	int ret = 0;
+	int ret;
 
+	/* Get PHYs for the controller */
 	for_each_available_child_of_node(dev->of_node, child) {
 		ret = of_property_read_u32(child, "reg", &phy_number);
 		if (ret) {
@@ -77,31 +73,21 @@ static int exynos_ehci_get_phy(struct device *dev,
 		}
 
 		phy = devm_of_phy_get(dev, child, NULL);
+		exynos_ehci->phy[phy_number] = phy;
 		of_node_put(child);
-		if (IS_ERR(phy))
-			/* Lets fallback to older USB-PHYs */
-			goto usb_phy_old;
-		exynos_ehci->phy_g[phy_number] = phy;
-		/* Make the older PHYs unavailable */
-		exynos_ehci->phy = ERR_PTR(-ENXIO);
-	}
-
-	return 0;
-
-usb_phy_old:
-	exynos_ehci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
-	if (IS_ERR(exynos_ehci->phy)) {
-		ret = PTR_ERR(exynos_ehci->phy);
-		if (ret != -ENXIO && ret != -ENODEV) {
-			dev_err(dev, "no usb2 phy configured\n");
-			return ret;
+		if (IS_ERR(phy)) {
+			ret = PTR_ERR(phy);
+			if (ret == -EPROBE_DEFER) {
+				return ret;
+			} else if (ret != -ENOSYS && ret != -ENODEV) {
+				dev_err(dev,
+					"Error retrieving usb2 phy: %d\n", ret);
+				return PTR_ERR(phy);
+			}
 		}
-		dev_dbg(dev, "Failed to get usb2 phy\n");
-	} else {
-		exynos_ehci->otg = exynos_ehci->phy->otg;
 	}
 
-	return ret;
+	return 0;
 }
 
 static int exynos_ehci_phy_enable(struct device *dev)
@@ -111,16 +97,13 @@ static int exynos_ehci_phy_enable(struct device *dev)
 	int i;
 	int ret = 0;
 
-	if (!IS_ERR(exynos_ehci->phy))
-		return usb_phy_init(exynos_ehci->phy);
-
 	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
-		if (!IS_ERR(exynos_ehci->phy_g[i]))
-			ret = phy_power_on(exynos_ehci->phy_g[i]);
+		if (!IS_ERR(exynos_ehci->phy[i]))
+			ret = phy_power_on(exynos_ehci->phy[i]);
 	if (ret)
 		for (i--; i >= 0; i--)
-			if (!IS_ERR(exynos_ehci->phy_g[i]))
-				phy_power_off(exynos_ehci->phy_g[i]);
+			if (!IS_ERR(exynos_ehci->phy[i]))
+				phy_power_off(exynos_ehci->phy[i]);
 
 	return ret;
 }
@@ -131,14 +114,9 @@ static void exynos_ehci_phy_disable(struct device *dev)
 	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
 	int i;
 
-	if (!IS_ERR(exynos_ehci->phy)) {
-		usb_phy_shutdown(exynos_ehci->phy);
-		return;
-	}
-
 	for (i = 0; i < PHY_NUMBER; i++)
-		if (!IS_ERR(exynos_ehci->phy_g[i]))
-			phy_power_off(exynos_ehci->phy_g[i]);
+		if (!IS_ERR(exynos_ehci->phy[i]))
+			phy_power_off(exynos_ehci->phy[i]);
 }
 
 static void exynos_setup_vbus_gpio(struct device *dev)
@@ -231,9 +209,6 @@ skip_phy:
 		goto fail_io;
 	}
 
-	if (exynos_ehci->otg)
-		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
-
 	err = exynos_ehci_phy_enable(&pdev->dev);
 	if (err) {
 		dev_err(&pdev->dev, "Failed to enable USB phy\n");
@@ -273,9 +248,6 @@ static int exynos_ehci_remove(struct platform_device *pdev)
 
 	usb_remove_hcd(hcd);
 
-	if (exynos_ehci->otg)
-		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
-
 	exynos_ehci_phy_disable(&pdev->dev);
 
 	clk_disable_unprepare(exynos_ehci->clk);
@@ -298,9 +270,6 @@ static int exynos_ehci_suspend(struct device *dev)
 	if (rc)
 		return rc;
 
-	if (exynos_ehci->otg)
-		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
-
 	exynos_ehci_phy_disable(dev);
 
 	clk_disable_unprepare(exynos_ehci->clk);
@@ -316,9 +285,6 @@ static int exynos_ehci_resume(struct device *dev)
 
 	clk_prepare_enable(exynos_ehci->clk);
 
-	if (exynos_ehci->otg)
-		exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
-
 	ret = exynos_ehci_phy_enable(dev);
 	if (ret) {
 		dev_err(dev, "Failed to enable USB phy\n");
-- 
1.7.10.4