From 5c349e179db794eff99dd5d3bbac6845d173709e Mon Sep 17 00:00:00 2001 From: Patrice Chotard Date: Tue, 4 Sep 2018 11:37:25 +0200 Subject: 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 --- drivers/usb/host/ehci-generic.c | 62 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 61 insertions(+), 1 deletion(-) (limited to 'drivers/usb/host') diff --git a/drivers/usb/host/ehci-generic.c b/drivers/usb/host/ehci-generic.c index cc2f33826a..0270f3bc95 100644 --- a/drivers/usb/host/ehci-generic.c +++ b/drivers/usb/host/ehci-generic.c @@ -11,6 +11,7 @@ #include #include #include "ehci.h" +#include /* * 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; -- cgit v1.2.3