@@ -52,6 +52,10 @@ Required properties:
Optional properties:
- dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"
+- switch-gpio: A phandle + gpio-specifier pair. Some boards are using Dual
+ SPDT USB Switch, witch is cotrolled by GPIO to de/multiplex
+ D+/D- USB lines between connectors.
+
- qcom,phy-init-sequence: PHY configuration sequence values. This is related to Device
Mode Eye Diagram test. Start address at which these values will be
written is ULPI_EXT_VENDOR_SPECIFIC. Value of -1 is reserved as
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/device.h>
+#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
@@ -32,6 +33,7 @@
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/reboot.h>
#include <linux/reset.h>
#include <linux/usb.h>
@@ -1471,6 +1473,14 @@ static int msm_otg_vbus_notifier(struct notifier_block *nb, unsigned long event,
else
clear_bit(B_SESS_VLD, &motg->inputs);
+ if (test_bit(B_SESS_VLD, &motg->inputs)) {
+ /* Switch D+/D- lines to Device connector */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+ } else {
+ /* Switch D+/D- lines to Hub */
+ gpiod_set_value_cansleep(motg->switch_gpio, 1);
+ }
+
schedule_work(&motg->sm_work);
return NOTIFY_DONE;
@@ -1546,6 +1556,11 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
motg->manual_pullup = of_property_read_bool(node, "qcom,manual-pullup");
+ motg->switch_gpio = devm_gpiod_get_optional(&pdev->dev, "switch",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(motg->switch_gpio))
+ return PTR_ERR(motg->switch_gpio);
+
ext_id = ERR_PTR(-ENODEV);
ext_vbus = ERR_PTR(-ENODEV);
if (of_property_read_bool(node, "extcon")) {
@@ -1615,6 +1630,19 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
return 0;
}
+static int msm_otg_reboot_notify(struct notifier_block *this,
+ unsigned long code, void *unused)
+{
+ struct msm_otg *motg = container_of(this, struct msm_otg, reboot);
+
+ /*
+ * Ensure that D+/D- lines are routed to uB connector, so
+ * we could load bootloader/kernel at next reboot
+ */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+ return NOTIFY_DONE;
+}
+
static int msm_otg_probe(struct platform_device *pdev)
{
struct regulator_bulk_data regs[3];
@@ -1779,6 +1807,17 @@ static int msm_otg_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "Can not create mode change file\n");
}
+ if (test_bit(B_SESS_VLD, &motg->inputs)) {
+ /* Switch D+/D- lines to Device connector */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+ } else {
+ /* Switch D+/D- lines to Hub */
+ gpiod_set_value_cansleep(motg->switch_gpio, 1);
+ }
+
+ motg->reboot.notifier_call = msm_otg_reboot_notify;
+ register_reboot_notifier(&motg->reboot);
+
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
@@ -1805,11 +1844,19 @@ static int msm_otg_remove(struct platform_device *pdev)
if (phy->otg->host || phy->otg->gadget)
return -EBUSY;
+ unregister_reboot_notifier(&motg->reboot);
+
if (motg->id.conn.edev)
extcon_unregister_interest(&motg->id.conn);
if (motg->vbus.conn.edev)
extcon_unregister_interest(&motg->vbus.conn);
+ /*
+ * Ensure that D+/D- lines are routed to uB connector, so
+ * we could load bootloader/kernel at next reboot
+ */
+ gpiod_set_value_cansleep(motg->switch_gpio, 0);
+
msm_otg_debugfs_cleanup();
cancel_delayed_work_sync(&motg->chg_work);
cancel_work_sync(&motg->sm_work);
@@ -155,6 +155,10 @@ struct msm_usb_cable {
* starting controller using usbcmd run/stop bit.
* @vbus: VBUS signal state trakining, using extcon framework
* @id: ID signal state trakining, using extcon framework
+ * @switch_gpio: Descriptor for GPIO used to control external Dual
+ * SPDT USB Switch.
+ * @reboot: Used to inform the driver to route USB D+/D- line to Device
+ * connector
*/
struct msm_otg {
struct usb_phy phy;
@@ -188,6 +192,9 @@ struct msm_otg {
struct msm_usb_cable vbus;
struct msm_usb_cable id;
+
+ struct gpio_desc *switch_gpio;
+ struct notifier_block reboot;
};
#endif
apq8016-sbc board is using Dual SPDT USB Switch (TC7USB40MU), witch is controlled by GPIO to de/multiplex D+/D- USB lines to USB2513B Hub and uB connector. Add support for this. Signed-off-by: Ivan T. Ivanov <ivan.ivanov@linaro.org> --- .../devicetree/bindings/usb/msm-hsusb.txt | 4 ++ drivers/usb/phy/phy-msm-usb.c | 47 ++++++++++++++++++++++ include/linux/usb/msm_hsusb.h | 7 ++++ 3 files changed, 58 insertions(+) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html