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usb: phy: msm: Add D+/D- lines route control

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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>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Ivan T. Ivanov 2015-07-28 11:10:22 +03:00 committed by Felipe Balbi
parent 736d093b59
commit 6f98f545b0
3 changed files with 58 additions and 0 deletions
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4
Documentation/devicetree/bindings/usb/msm-hsusb.txt
View File

@ -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

47
drivers/usb/phy/phy-msm-usb.c
View File

@ -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")) {
@ -1617,6 +1632,19 @@ 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];
@ -1781,6 +1809,17 @@ 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);
@ -1807,6 +1846,14 @@ static int msm_otg_remove(struct platform_device *pdev)
if (phy->otg->host || phy->otg->gadget)
return -EBUSY;
unregister_reboot_notifier(&motg->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);
extcon_unregister_notifier(motg->id.extcon, EXTCON_USB_HOST, &motg->id.nb);
extcon_unregister_notifier(motg->vbus.extcon, EXTCON_USB, &motg->vbus.nb);

7
include/linux/usb/msm_hsusb.h
View File

@ -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