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

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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>
This commit is contained in:
Patrice Chotard 2018-09-04 11:37:25 +02:00 committed by Marek Vasut
parent ecb10a41c9
commit 5c349e179d
1 changed files with 61 additions and 1 deletions
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62
drivers/usb/host/ehci-generic.c
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@ -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;