The parameter can be used by init scripts to detect a plugged usb cable.
Upon a plugged usb cable the barebox behaviour can be changed which can
be useful e.g. during production to apply a special production
environment.
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
---
v2:
- move vbus_valid into 'struct imx_usbphy' to avoid global vars
- add comment
drivers/usb/imx/imx-usb-phy.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/imx/imx-usb-phy.c b/drivers/usb/imx/imx-usb-phy.c
index 32098ef248..6a58e71ba2 100644
--- a/drivers/usb/imx/imx-usb-phy.c
+++ b/drivers/usb/imx/imx-usb-phy.c
@@ -37,9 +37,12 @@
#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)
#define ANADIG_USB1_CHRG_DETECT_SET 0x1b4
-#define ANADIG_USB2_CHRG_DETECT_SET 0x214
#define ANADIG_USB1_CHRG_DETECT_EN_B BIT(20)
#define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B BIT(19)
+#define ANADIG_USB1_VBUS_DETECT_STAT 0x1c0
+#define ANADIG_USB1_VBUS_DETECT_STAT_VBUS_VALID BIT(3)
+#define ANADIG_USB2_CHRG_DETECT_SET 0x214
+#define ANADIG_USB2_VBUS_DETECT_STAT 0x220
struct imx_usbphy {
struct usb_phy usb_phy;
@@ -49,6 +52,8 @@ struct imx_usbphy {
struct clk *clk;
struct phy_provider *provider;
int port_id;
+
+ unsigned int vbus_valid;
};
static int imx_usbphy_phy_init(struct phy *phy)
@@ -132,6 +137,21 @@ static const struct phy_ops imx_phy_ops = {
.to_usbphy = imx_usbphy_to_usbphy,
};
+static int imx_usbphy_get_vbus_state(struct param_d *p, void *priv)
+{
+ struct imx_usbphy *imxphy = priv;
+ unsigned int reg, val;
+
+ reg = imxphy->port_id ?
+ ANADIG_USB1_VBUS_DETECT_STAT :
+ ANADIG_USB2_VBUS_DETECT_STAT;
+ val = readl(imxphy->anatop + reg);
+
+ imxphy->vbus_valid = !!(val & ANADIG_USB1_VBUS_DETECT_STAT_VBUS_VALID);
+
+ return 0;
+}
+
static int imx_usbphy_probe(struct device_d *dev)
{
struct resource *iores;
@@ -154,6 +174,15 @@ static int imx_usbphy_probe(struct device_d *dev)
ret = PTR_ERR_OR_ZERO(imxphy->anatop);
if (ret)
goto err_free;
+
+ /*
+ * This is useful in case of usb-otg = device. In host case
+ * it isn't that useful since we are the supplier of the vbus
+ * signal.
+ */
+ dev_add_param_bool(dev, "vbus_valid", param_set_readonly,
+ imx_usbphy_get_vbus_state,
+ &imxphy->vbus_valid, imxphy);
}
iores = dev_request_mem_resource(dev, 0);
--
2.30.2
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