usb: ehci-generic: Add vbus-supply regulator support

Add vbus-supply regulator support.
On some board vbus is not controlled by the phy but by
an external regulator.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

diff --git a/drivers/usb/host/ehci-generic.c b/drivers/usb/host/ehci-generic.c
index cc2f33826a3bf19a545960843f2c4597a2cd8946..0270f3bc95acac5a14c56c46316ed2ac8612ffd9 100644 (file)
--- a/drivers/usb/host/ehci-generic.c
+++ b/drivers/usb/host/ehci-generic.c
@@ -11,6 +11,7 @@
 #include <asm/io.h>
 #include <dm.h>
 #include "ehci.h"
+#include <power/regulator.h>
 
 /*
  * Even though here we don't explicitly use "struct ehci_ctrl"
@@ -22,10 +23,56 @@ struct generic_ehci {
        struct clk *clocks;
        struct reset_ctl *resets;
        struct phy phy;
+#ifdef CONFIG_DM_REGULATOR
+       struct udevice *vbus_supply;
+#endif
        int clock_count;
        int reset_count;
 };
 
+#ifdef CONFIG_DM_REGULATOR
+static int ehci_enable_vbus_supply(struct udevice *dev)
+{
+       struct generic_ehci *priv = dev_get_priv(dev);
+       int ret;
+
+       ret = device_get_supply_regulator(dev, "vbus-supply",
+                                         &priv->vbus_supply);
+       if (ret && ret != -ENOENT)
+               return ret;
+
+       if (priv->vbus_supply) {
+               ret = regulator_set_enable(priv->vbus_supply, true);
+               if (ret) {
+                       dev_err(dev, "Error enabling VBUS supply\n");
+                       return ret;
+               }
+       } else {
+               dev_dbg(dev, "No vbus supply\n");
+       }
+
+       return 0;
+}
+
+static int ehci_disable_vbus_supply(struct generic_ehci *priv)
+{
+       if (priv->vbus_supply)
+               return regulator_set_enable(priv->vbus_supply, false);
+       else
+               return 0;
+}
+#else
+static int ehci_enable_vbus_supply(struct udevice *dev)
+{
+       return 0;
+}
+
+static int ehci_disable_vbus_supply(struct generic_ehci *priv)
+{
+       return 0;
+}
+#endif
+
 static int ehci_usb_probe(struct udevice *dev)
 {
        struct generic_ehci *priv = dev_get_priv(dev);
@@ -95,10 +142,14 @@ static int ehci_usb_probe(struct udevice *dev)
                }
        }
 
-       err = ehci_setup_phy(dev, &priv->phy, 0);
+       err = ehci_enable_vbus_supply(dev);
        if (err)
                goto reset_err;
 
+       err = ehci_setup_phy(dev, &priv->phy, 0);
+       if (err)
+               goto regulator_err;
+
        hccr = map_physmem(dev_read_addr(dev), 0x100, MAP_NOCACHE);
        hcor = (struct ehci_hcor *)((uintptr_t)hccr +
                                    HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
@@ -114,6 +165,11 @@ phy_err:
        if (ret)
                dev_err(dev, "failed to shutdown usb phy\n");
 
+regulator_err:
+       ret = ehci_disable_vbus_supply(priv);
+       if (ret)
+               dev_err(dev, "failed to disable VBUS supply\n");
+
 reset_err:
        ret = reset_release_all(priv->resets, priv->reset_count);
        if (ret)
@@ -139,6 +195,10 @@ static int ehci_usb_remove(struct udevice *dev)
        if (ret)
                return ret;
 
+       ret = ehci_disable_vbus_supply(priv);
+       if (ret)
+               return ret;
+
        ret =  reset_release_all(priv->resets, priv->reset_count);
        if (ret)
                return ret;