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phy: stm32: usbphyc: manage optional vbus regulator on phy_power_on/off

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This patch adds support for optional vbus regulator.
It is managed on phy_power_on/off calls and may be needed for host mode.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay 2020-10-15 14:50:57 +02:00
parent e27e96aa80
commit c480138958
2 changed files with 25 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
doc/device-tree-bindings/phy/phy-stm32-usbphyc.txt
View File

@ -45,6 +45,8 @@ Required properties:
- #phy-cells: see phy-bindings.txt in the same directory, must be <0> for PHY
port#1 and must be <1> for PHY port#2, to select USB controller
Optional properties:
- vbus-supply: phandle to the regulator providing 5V vbus to the USB connector
Example:
usbphyc: usb-phy@5a006000 {

33
drivers/phy/phy-stm32-usbphyc.c
View File

@ -59,6 +59,7 @@ struct stm32_usbphyc {
struct udevice *vdda1v8;
struct stm32_usbphyc_phy {
struct udevice *vdd;
struct udevice *vbus;
bool init;
bool powered;
} phys[MAX_PHYS];
@ -244,6 +245,11 @@ static int stm32_usbphyc_phy_power_on(struct phy *phy)
if (ret)
return ret;
}
if (usbphyc_phy->vbus) {
ret = regulator_set_enable(usbphyc_phy->vbus, true);
if (ret)
return ret;
}
usbphyc_phy->powered = true;
@ -262,6 +268,11 @@ static int stm32_usbphyc_phy_power_off(struct phy *phy)
if (stm32_usbphyc_is_powered(usbphyc))
return 0;
if (usbphyc_phy->vbus) {
ret = regulator_set_enable(usbphyc_phy->vbus, false);
if (ret)
return ret;
}
if (usbphyc_phy->vdd) {
ret = regulator_set_enable_if_allowed(usbphyc_phy->vdd, false);
if (ret)
@ -271,7 +282,7 @@ static int stm32_usbphyc_phy_power_off(struct phy *phy)
return 0;
}
static int stm32_usbphyc_get_regulator(struct udevice *dev, ofnode node,
static int stm32_usbphyc_get_regulator(ofnode node,
char *supply_name,
struct udevice **regulator)
{
@ -281,19 +292,14 @@ static int stm32_usbphyc_get_regulator(struct udevice *dev, ofnode node,
ret = ofnode_parse_phandle_with_args(node, supply_name,
NULL, 0, 0,
&regulator_phandle);
if (ret) {
dev_err(dev, "Can't find %s property (%d)\n", supply_name, ret);
if (ret)
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_REGULATOR,
regulator_phandle.node,
regulator);
if (ret) {
dev_err(dev, "Can't get %s regulator (%d)\n", supply_name, ret);
if (ret)
return ret;
}
return 0;
}
@ -380,10 +386,17 @@ static int stm32_usbphyc_probe(struct udevice *dev)
usbphyc_phy->init = false;
usbphyc_phy->powered = false;
ret = stm32_usbphyc_get_regulator(dev, node, "phy-supply",
ret = stm32_usbphyc_get_regulator(node, "phy-supply",
&usbphyc_phy->vdd);
if (ret)
if (ret) {
dev_err(dev, "Can't get phy-supply regulator\n");
return ret;
}
ret = stm32_usbphyc_get_regulator(node, "vbus-supply",
&usbphyc_phy->vbus);
if (ret)
usbphyc_phy->vbus = NULL;
node = dev_read_next_subnode(node);
}