[PATCH v3 1/7] phy-sun4i-usb: Use bool where appropriate

[PATCH v3 1/7] phy-sun4i-usb: Use bool where appropriate

[Hans de Goede]

We're using bool as true/false type in most places in phy-sun4i-usb.c
for consistency fixup the remaining uses of ints which are ever only
0 or 1 to be bools too.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-No changes
Changes in v3:
-No changes
---
 drivers/phy/phy-sun4i-usb.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index fcf4d95e..1cb84a8 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -445,7 +445,8 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
 	struct sun4i_usb_phy_data *data =
 		container_of(work, struct sun4i_usb_phy_data, detect.work);
 	struct phy *phy0 = data->phys[0].phy;
-	int id_det, vbus_det, id_notify = 0, vbus_notify = 0;
+	bool id_notify = false, vbus_notify = false;
+	int id_det, vbus_det;
 
 	if (phy0 == NULL)
 		return;
@@ -474,13 +475,13 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
 		}
 		sun4i_usb_phy0_set_id_detect(phy0, id_det);
 		data->id_det = id_det;
-		id_notify = 1;
+		id_notify = true;
 	}
 
 	if (vbus_det != data->vbus_det) {
 		sun4i_usb_phy0_set_vbus_detect(phy0, vbus_det);
 		data->vbus_det = vbus_det;
-		vbus_notify = 1;
+		vbus_notify = true;
 	}
 
 	mutex_unlock(&phy0->mutex);
-- 
2.7.4

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[PATCH v3 2/7] phy-sun4i-usb: Refactor forced session ending

[Hans de Goede]

The phy-sun4i-usb code supports forced ending a session on systems
which lack Vbus detection, to allow switching between host and peripheral
mode on such systems.

Role switching via the musb driver "mode" sysfs attribute requires force
ending the session too. This commit refactors the code to allow other
parts of the phy-sun4i-usb code to request a forced session end.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-No changes
Changes in v3:
-No changes
---
 drivers/phy/phy-sun4i-usb.c | 27 +++++++++++++--------------
 1 file changed, 13 insertions(+), 14 deletions(-)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index 1cb84a8..02cb65e 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -133,6 +133,7 @@ struct sun4i_usb_phy_data {
 	struct power_supply *vbus_power_supply;
 	struct notifier_block vbus_power_nb;
 	bool vbus_power_nb_registered;
+	bool force_session_end;
 	int id_det_irq;
 	int vbus_det_irq;
 	int id_det;
@@ -445,7 +446,7 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
 	struct sun4i_usb_phy_data *data =
 		container_of(work, struct sun4i_usb_phy_data, detect.work);
 	struct phy *phy0 = data->phys[0].phy;
-	bool id_notify = false, vbus_notify = false;
+	bool force_session_end, id_notify = false, vbus_notify = false;
 	int id_det, vbus_det;
 
 	if (phy0 == NULL)
@@ -461,14 +462,17 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
 		return;
 	}
 
+	force_session_end = data->force_session_end;
+	data->force_session_end = false;
+
 	if (id_det != data->id_det) {
-		/*
-		 * When a host cable (id == 0) gets plugged in on systems
-		 * without vbus detection report vbus low for long enough for
-		 * the musb-ip to end the current device session.
-		 */
+		/* id-change, force session end if we've no vbus detection */
 		if (data->dr_mode == USB_DR_MODE_OTG &&
-		    !sun4i_usb_phy0_have_vbus_det(data) && id_det == 0) {
+		    !sun4i_usb_phy0_have_vbus_det(data))
+			force_session_end = true;
+
+		/* When entering host mode (id = 0) force end the session now */
+		if (force_session_end && id_det == 0) {
 			sun4i_usb_phy0_set_vbus_detect(phy0, 0);
 			msleep(200);
 			sun4i_usb_phy0_set_vbus_detect(phy0, 1);
@@ -489,13 +493,8 @@ static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
 	if (id_notify) {
 		extcon_set_cable_state_(data->extcon, EXTCON_USB_HOST,
 					!id_det);
-		/*
-		 * When a host cable gets unplugged (id == 1) on systems
-		 * without vbus detection report vbus low for long enough to
-		 * the musb-ip to end the current host session.
-		 */
-		if (data->dr_mode == USB_DR_MODE_OTG &&
-		    !sun4i_usb_phy0_have_vbus_det(data) && id_det == 1) {
+		/* When leaving host mode force end the session here */
+		if (force_session_end && id_det == 1) {
 			mutex_lock(&phy0->mutex);
 			sun4i_usb_phy0_set_vbus_detect(phy0, 0);
 			msleep(1000);
-- 
2.7.4

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[PATCH v3 3/7] phy-sun4i-usb: Simplify missing dr_mode handling

[Hans de Goede]

If we cannot get dr_mode or no id gpio is specified simply assume
peripheral mode, as this is always safe.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-Keep sun4i_usb_phy0_get_id_det() logic as is rather then re-ordering
 the switch-case
Changes in v3:
-No changes
---
 drivers/phy/phy-sun4i-usb.c | 42 ++++++++++++++----------------------------
 1 file changed, 14 insertions(+), 28 deletions(-)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index 02cb65e..fb2d4f3 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -124,7 +124,6 @@ struct sun4i_usb_phy_data {
 		bool regulator_on;
 		int index;
 	} phys[MAX_PHYS];
-	int first_phy;
 	/* phy0 / otg related variables */
 	struct extcon_dev *extcon;
 	bool phy0_init;
@@ -326,7 +325,10 @@ static int sun4i_usb_phy0_get_id_det(struct sun4i_usb_phy_data *data)
 {
 	switch (data->dr_mode) {
 	case USB_DR_MODE_OTG:
-		return gpiod_get_value_cansleep(data->id_det_gpio);
+		if (data->id_det_gpio)
+			return gpiod_get_value_cansleep(data->id_det_gpio);
+		else
+			return 1; /* Fallback to peripheral mode */
 	case USB_DR_MODE_HOST:
 		return 0;
 	case USB_DR_MODE_PERIPHERAL:
@@ -539,8 +541,7 @@ static struct phy *sun4i_usb_phy_xlate(struct device *dev,
 {
 	struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
 
-	if (args->args[0] < data->first_phy ||
-	    args->args[0] >= data->cfg->num_phys)
+	if (args->args[0] >= data->cfg->num_phys)
 		return ERR_PTR(-ENODEV);
 
 	return data->phys[args->args[0]].phy;
@@ -615,33 +616,18 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 	}
 
 	data->dr_mode = of_usb_get_dr_mode_by_phy(np, 0);
-	switch (data->dr_mode) {
-	case USB_DR_MODE_OTG:
-		/* otg without id_det makes no sense, and is not supported */
-		if (!data->id_det_gpio) {
-			dev_err(dev, "usb0_id_det missing or invalid\n");
-			return -ENODEV;
-		}
-		/* fall through */
-	case USB_DR_MODE_HOST:
-	case USB_DR_MODE_PERIPHERAL:
-		data->extcon = devm_extcon_dev_allocate(dev,
-							sun4i_usb_phy0_cable);
-		if (IS_ERR(data->extcon))
-			return PTR_ERR(data->extcon);
 
-		ret = devm_extcon_dev_register(dev, data->extcon);
-		if (ret) {
-			dev_err(dev, "failed to register extcon: %d\n", ret);
-			return ret;
-		}
-		break;
-	default:
-		dev_info(dev, "dr_mode unknown, not registering usb phy0\n");
-		data->first_phy = 1;
+	data->extcon = devm_extcon_dev_allocate(dev, sun4i_usb_phy0_cable);
+	if (IS_ERR(data->extcon))
+		return PTR_ERR(data->extcon);
+
+	ret = devm_extcon_dev_register(dev, data->extcon);
+	if (ret) {
+		dev_err(dev, "failed to register extcon: %d\n", ret);
+		return ret;
 	}
 
-	for (i = data->first_phy; i < data->cfg->num_phys; i++) {
+	for (i = 0; i < data->cfg->num_phys; i++) {
 		struct sun4i_usb_phy *phy = data->phys + i;
 		char name[16];
 
-- 
2.7.4

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[PATCH v3 4/7] phy-sun4i-usb: Add support for phy_set_mode

[Hans de Goede]

Together with some musb sunxi glue changes this allows run-time dr_mode
switching support via the "mode" musb sysfs attribute.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-No changes
Changes in v3:
-Fix switch-case code style
---
 drivers/phy/phy-sun4i-usb.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index fb2d4f3..af42f8d 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -427,6 +427,35 @@ static int sun4i_usb_phy_power_off(struct phy *_phy)
 	return 0;
 }
 
+static int sun4i_usb_phy_set_mode(struct phy *_phy, enum phy_mode mode)
+{
+	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
+	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
+
+	if (phy->index != 0)
+		return -EINVAL;
+
+	switch (mode) {
+	case PHY_MODE_USB_HOST:
+		data->dr_mode = USB_DR_MODE_HOST;
+		break;
+	case PHY_MODE_USB_DEVICE:
+		data->dr_mode = USB_DR_MODE_PERIPHERAL;
+		break;
+	case PHY_MODE_USB_OTG:
+		data->dr_mode = USB_DR_MODE_OTG;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	dev_info(&_phy->dev, "Changing dr_mode to %d\n", (int)data->dr_mode);
+	data->force_session_end = true;
+	queue_delayed_work(system_wq, &data->detect, 0);
+
+	return 0;
+}
+
 void sun4i_usb_phy_set_squelch_detect(struct phy *_phy, bool enabled)
 {
 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
@@ -440,6 +469,7 @@ static const struct phy_ops sun4i_usb_phy_ops = {
 	.exit		= sun4i_usb_phy_exit,
 	.power_on	= sun4i_usb_phy_power_on,
 	.power_off	= sun4i_usb_phy_power_off,
+	.set_mode	= sun4i_usb_phy_set_mode,
 	.owner		= THIS_MODULE,
 };
 
-- 
2.7.4

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[PATCH v3 5/7] phy-sun4i-usb: Warn when external vbus is detected

[Hans de Goede]

Warn when external vbus is detected when we're trying to enable our
own vbus.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-No changes
Changes in v3:
-No changes
---
 drivers/phy/phy-sun4i-usb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index af42f8d..03f030b 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -390,8 +390,10 @@ static int sun4i_usb_phy_power_on(struct phy *_phy)
 
 	/* For phy0 only turn on Vbus if we don't have an ext. Vbus */
 	if (phy->index == 0 && sun4i_usb_phy0_have_vbus_det(data) &&
-				data->vbus_det)
+				data->vbus_det) {
+		dev_warn(&_phy->dev, "External vbus detected, not enabling our own vbus\n");
 		return 0;
+	}
 
 	ret = regulator_enable(phy->vbus);
 	if (ret)
-- 
2.7.4

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Re: [PATCH v3 5/7] phy-sun4i-usb: Warn when external vbus is detected

[Icenowy Zheng]

21.08.2016, 20:22, "Hans de Goede" <hdegoede@redhat.com>:
> Warn when external vbus is detected when we're trying to enable our
> own vbus.

Will it lead to a dmesg flood if a not-well-connected USB OTG Charging Hub
is present?

>
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> Changes in v2:
> -No changes
> Changes in v3:
> -No changes
> ---
>  drivers/phy/phy-sun4i-usb.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
> index af42f8d..03f030b 100644
> --- a/drivers/phy/phy-sun4i-usb.c
> +++ b/drivers/phy/phy-sun4i-usb.c
> @@ -390,8 +390,10 @@ static int sun4i_usb_phy_power_on(struct phy *_phy)
>
>          /* For phy0 only turn on Vbus if we don't have an ext. Vbus */
>          if (phy->index == 0 && sun4i_usb_phy0_have_vbus_det(data) &&
> - data->vbus_det)
> + data->vbus_det) {
> + dev_warn(&_phy->dev, "External vbus detected, not enabling our own vbus\n");
>                  return 0;
> + }
>
>          ret = regulator_enable(phy->vbus);
>          if (ret)
> --
> 2.7.4
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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Re: [PATCH v3 5/7] phy-sun4i-usb: Warn when external vbus is detected

[Hans de Goede]

Hi,

On 21-08-16 16:32, Icenowy Zheng wrote:
>
>
> 21.08.2016, 20:22, "Hans de Goede" <hdegoede@redhat.com>:
>> Warn when external vbus is detected when we're trying to enable our
>> own vbus.
>
> Will it lead to a dmesg flood if a not-well-connected USB OTG Charging Hub
> is present?

No, we only try to turn on Vbus once when switching to host-mode.

When using a device which is actually providing power and has an
id pin claiming it wants the port in host mode then this message
will trigger once. I'm actually adding it exactly because of the
USB OTG Charging Hub case. In this case you want to see this
messages once, if you're not seeing it and the hub is sending
power to the micro-usb port then something is wrong.

Note in many cases these hubs will only send power when in
charging mode and in this case the the id-pin is such
that the micro-usb port will be in device mode and will
never try to provide power. In this scenario you will not
get the warning, not will Linux see the hub.

Regards,

Hans






>
>>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>> ---
>> Changes in v2:
>> -No changes
>> Changes in v3:
>> -No changes
>> ---
>>  drivers/phy/phy-sun4i-usb.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
>> index af42f8d..03f030b 100644
>> --- a/drivers/phy/phy-sun4i-usb.c
>> +++ b/drivers/phy/phy-sun4i-usb.c
>> @@ -390,8 +390,10 @@ static int sun4i_usb_phy_power_on(struct phy *_phy)
>>
>>          /* For phy0 only turn on Vbus if we don't have an ext. Vbus */
>>          if (phy->index == 0 && sun4i_usb_phy0_have_vbus_det(data) &&
>> - data->vbus_det)
>> + data->vbus_det) {
>> + dev_warn(&_phy->dev, "External vbus detected, not enabling our own vbus\n");
>>                  return 0;
>> + }
>>
>>          ret = regulator_enable(phy->vbus);
>>          if (ret)
>> --
>> 2.7.4
>>
>> _______________________________________________
>> linux-arm-kernel mailing list
>> linux-arm-kernel@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v3 6/7] phy-sun4i-usb: Add "allwinner,usb0-usb-a-connector" dt property

[Hans de Goede]

On some devices the musb otg controller can be used in both device and
host mode, but requires software mode switching since there is no id pin
connected. The usb0 phy code will default to device mode in this case.

On some systems usb0 is connected to a female USB-A port. It can still
be used in device mode when using software mode switching and a USB
A to A cable. To configure the controller to support both modes we must
set its "dr_mode" dt property to "otg" (*). For these setups the device
mode default is wrong, for a female USB-A port the default should be
host mode.

This commit adds support to the sun4i phy code for a new
"allwinner,usb0-usb-a-connector" dt property which can be used in dt
files to indicate this scenario and when present it changes the default
mode to host mode.

*) dr_mode = "host" is used when device mode is _never_ used. E.g.
a wifi module soldered onto the PCB is connected to the musb controller.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-New patch in v2 of this patchset
Changes in v3:
-No changes
---
 Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt | 2 ++
 drivers/phy/phy-sun4i-usb.c                             | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
index 287150d..8646b53 100644
--- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
+++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
@@ -35,6 +35,8 @@ Optional properties:
 - usb0_vbus-supply : regulator phandle for controller usb0 vbus
 - usb1_vbus-supply : regulator phandle for controller usb1 vbus
 - usb2_vbus-supply : regulator phandle for controller usb2 vbus
+- allwinner,usb0-usb-a-connector: usb0 is connected to an USB-A connector,
+                     rather then an USB-B connector as one would expect (bool)
 
 Example:
 	usbphy: phy@0x01c13400 {
diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index 03f030b..0b05f17 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -137,6 +137,7 @@ struct sun4i_usb_phy_data {
 	int vbus_det_irq;
 	int id_det;
 	int vbus_det;
+	int id_det_default;
 	struct delayed_work detect;
 };
 
@@ -328,7 +329,7 @@ static int sun4i_usb_phy0_get_id_det(struct sun4i_usb_phy_data *data)
 		if (data->id_det_gpio)
 			return gpiod_get_value_cansleep(data->id_det_gpio);
 		else
-			return 1; /* Fallback to peripheral mode */
+			return data->id_det_default;
 	case USB_DR_MODE_HOST:
 		return 0;
 	case USB_DR_MODE_PERIPHERAL:
@@ -627,6 +628,12 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
 	if (IS_ERR(data->base))
 		return PTR_ERR(data->base);
 
+	/* Set id-det default for when there is no id-det gpio */
+	if (of_property_read_bool(np, "allwinner,usb0-usb-a-connector"))
+		data->id_det_default = 0; /* Host (USB-A connector) */
+	else
+		data->id_det_default = 1; /* Device (USB-B connector) */
+
 	data->id_det_gpio = devm_gpiod_get_optional(dev, "usb0_id_det",
 						    GPIOD_IN);
 	if (IS_ERR(data->id_det_gpio))
-- 
2.7.4

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Re: [PATCH v3 6/7] phy-sun4i-usb: Add "allwinner,usb0-usb-a-connector" dt property

[Rob Herring]

On Sun, Aug 21, 2016 at 02:16:38PM +0200, Hans de Goede wrote:
> On some devices the musb otg controller can be used in both device and
> host mode, but requires software mode switching since there is no id pin
> connected. The usb0 phy code will default to device mode in this case.
> 
> On some systems usb0 is connected to a female USB-A port. It can still
> be used in device mode when using software mode switching and a USB
> A to A cable. To configure the controller to support both modes we must
> set its "dr_mode" dt property to "otg" (*). For these setups the device
> mode default is wrong, for a female USB-A port the default should be
> host mode.
> 
> This commit adds support to the sun4i phy code for a new
> "allwinner,usb0-usb-a-connector" dt property which can be used in dt
> files to indicate this scenario and when present it changes the default
> mode to host mode.
> 
> *) dr_mode = "host" is used when device mode is _never_ used. E.g.
> a wifi module soldered onto the PCB is connected to the musb controller.
> 
> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
> Changes in v2:
> -New patch in v2 of this patchset
> Changes in v3:
> -No changes
> ---
>  Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt | 2 ++
>  drivers/phy/phy-sun4i-usb.c                             | 9 ++++++++-
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
> index 287150d..8646b53 100644
> --- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
> @@ -35,6 +35,8 @@ Optional properties:
>  - usb0_vbus-supply : regulator phandle for controller usb0 vbus
>  - usb1_vbus-supply : regulator phandle for controller usb1 vbus
>  - usb2_vbus-supply : regulator phandle for controller usb2 vbus
> +- allwinner,usb0-usb-a-connector: usb0 is connected to an USB-A connector,
> +                     rather then an USB-B connector as one would expect (bool)

This seems like a pretty generic problem: a board has an A connector 
wired to an OTG controller. So I think we should have a generic 
property. The only part is here that is not is you have 3 USB buses for 
the PHY. That probably should have been 3 child nodes for each PHY port.

Rob
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Re: [PATCH v3 6/7] phy-sun4i-usb: Add "allwinner,usb0-usb-a-connector" dt property

[Hans de Goede]

Hi,

On 08/23/2016 08:00 PM, Rob Herring wrote:
> On Sun, Aug 21, 2016 at 02:16:38PM +0200, Hans de Goede wrote:
>> On some devices the musb otg controller can be used in both device and
>> host mode, but requires software mode switching since there is no id pin
>> connected. The usb0 phy code will default to device mode in this case.
>>
>> On some systems usb0 is connected to a female USB-A port. It can still
>> be used in device mode when using software mode switching and a USB
>> A to A cable. To configure the controller to support both modes we must
>> set its "dr_mode" dt property to "otg" (*). For these setups the device
>> mode default is wrong, for a female USB-A port the default should be
>> host mode.
>>
>> This commit adds support to the sun4i phy code for a new
>> "allwinner,usb0-usb-a-connector" dt property which can be used in dt
>> files to indicate this scenario and when present it changes the default
>> mode to host mode.
>>
>> *) dr_mode = "host" is used when device mode is _never_ used. E.g.
>> a wifi module soldered onto the PCB is connected to the musb controller.
>>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
>> Changes in v2:
>> -New patch in v2 of this patchset
>> Changes in v3:
>> -No changes
>> ---
>>  Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt | 2 ++
>>  drivers/phy/phy-sun4i-usb.c                             | 9 ++++++++-
>>  2 files changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> index 287150d..8646b53 100644
>> --- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> +++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> @@ -35,6 +35,8 @@ Optional properties:
>>  - usb0_vbus-supply : regulator phandle for controller usb0 vbus
>>  - usb1_vbus-supply : regulator phandle for controller usb1 vbus
>>  - usb2_vbus-supply : regulator phandle for controller usb2 vbus
>> +- allwinner,usb0-usb-a-connector: usb0 is connected to an USB-A connector,
>> +                     rather then an USB-B connector as one would expect (bool)
>
> This seems like a pretty generic problem: a board has an A connector
> wired to an OTG controller.  So I think we should have a generic
> property.

OK, any suggestions for a name ? And which bindings .txt file should
this go in ?

> The only part is here that is not is you have 3 USB buses for
> the PHY. That probably should have been 3 child nodes for each PHY port.

Only one is an otg phy / bus though, so we can just use the generic
property and apply it to bus0 / the otg-bus if present.

Regards,

Hans
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[PATCH v3 7/7] musb: sunxi: Add support for platform_set_mode

[Hans de Goede]

This allows run-time dr_mode switching support via the "mode" musb
sysfs attribute.

Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
Changes in v2:
-No changes
Changes in v3:
-Fix switch-case code style
---
 drivers/usb/musb/sunxi.c | 58 ++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 54 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
index c6ee166..649aaba 100644
--- a/drivers/usb/musb/sunxi.c
+++ b/drivers/usb/musb/sunxi.c
@@ -74,6 +74,7 @@
 #define SUNXI_MUSB_FL_HAS_SRAM			5
 #define SUNXI_MUSB_FL_HAS_RESET			6
 #define SUNXI_MUSB_FL_NO_CONFIGDATA		7
+#define SUNXI_MUSB_FL_PHY_MODE_PEND		8
 
 /* Our read/write methods need access and do not get passed in a musb ref :| */
 static struct musb *sunxi_musb;
@@ -87,6 +88,7 @@ struct sunxi_glue {
 	struct phy		*phy;
 	struct platform_device	*usb_phy;
 	struct usb_phy		*xceiv;
+	enum phy_mode		phy_mode;
 	unsigned long		flags;
 	struct work_struct	work;
 	struct extcon_dev	*extcon;
@@ -140,6 +142,9 @@ static void sunxi_musb_work(struct work_struct *work)
 			clear_bit(SUNXI_MUSB_FL_PHY_ON, &glue->flags);
 		}
 	}
+
+	if (test_and_clear_bit(SUNXI_MUSB_FL_PHY_MODE_PEND, &glue->flags))
+		phy_set_mode(glue->phy, glue->phy_mode);
 }
 
 static void sunxi_musb_set_vbus(struct musb *musb, int is_on)
@@ -341,6 +346,47 @@ static void sunxi_musb_dma_controller_destroy(struct dma_controller *c)
 {
 }
 
+static int sunxi_musb_set_mode(struct musb *musb, u8 mode)
+{
+	struct sunxi_glue *glue = dev_get_drvdata(musb->controller->parent);
+	enum phy_mode new_mode;
+
+	switch (mode) {
+	case MUSB_HOST:
+		new_mode = PHY_MODE_USB_HOST;
+		break;
+	case MUSB_PERIPHERAL:
+		new_mode = PHY_MODE_USB_DEVICE;
+		break;
+	case MUSB_OTG:
+		new_mode = PHY_MODE_USB_OTG;
+		break;
+	default:
+		dev_err(musb->controller->parent,
+			"Error requested mode not supported by this kernel\n");
+		return -EINVAL;
+	}
+
+	if (glue->phy_mode == new_mode)
+		return 0;
+
+	if (musb->port_mode != MUSB_PORT_MODE_DUAL_ROLE) {
+		dev_err(musb->controller->parent,
+			"Error changing modes is only supported in dual role mode\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * phy_set_mode may sleep, and we're called with a spinlock held,
+	 * so let sunxi_musb_work deal with it.
+	 */
+	glue->phy_mode = new_mode;
+	set_bit(SUNXI_MUSB_FL_PHY_MODE_PEND, &glue->flags);
+	schedule_work(&glue->work);
+
+	return 0;
+}
+
 /*
  * sunxi musb register layout
  * 0x00 - 0x17	fifo regs, 1 long per fifo
@@ -568,6 +614,7 @@ static const struct musb_platform_ops sunxi_musb_ops = {
 	.writew		= sunxi_musb_writew,
 	.dma_init	= sunxi_musb_dma_controller_create,
 	.dma_exit	= sunxi_musb_dma_controller_destroy,
+	.set_mode	= sunxi_musb_set_mode,
 	.set_vbus	= sunxi_musb_set_vbus,
 	.pre_root_reset_end = sunxi_musb_pre_root_reset_end,
 	.post_root_reset_end = sunxi_musb_post_root_reset_end,
@@ -614,21 +661,28 @@ static int sunxi_musb_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
+	if (!glue)
+		return -ENOMEM;
+
 	memset(&pdata, 0, sizeof(pdata));
 	switch (usb_get_dr_mode(&pdev->dev)) {
 #if defined CONFIG_USB_MUSB_DUAL_ROLE || defined CONFIG_USB_MUSB_HOST
 	case USB_DR_MODE_HOST:
 		pdata.mode = MUSB_PORT_MODE_HOST;
+		glue->phy_mode = PHY_MODE_USB_HOST;
 		break;
 #endif
 #if defined CONFIG_USB_MUSB_DUAL_ROLE || defined CONFIG_USB_MUSB_GADGET
 	case USB_DR_MODE_PERIPHERAL:
 		pdata.mode = MUSB_PORT_MODE_GADGET;
+		glue->phy_mode = PHY_MODE_USB_DEVICE;
 		break;
 #endif
 #ifdef CONFIG_USB_MUSB_DUAL_ROLE
 	case USB_DR_MODE_OTG:
 		pdata.mode = MUSB_PORT_MODE_DUAL_ROLE;
+		glue->phy_mode = PHY_MODE_USB_OTG;
 		break;
 #endif
 	default:
@@ -638,10 +692,6 @@ static int sunxi_musb_probe(struct platform_device *pdev)
 	pdata.platform_ops	= &sunxi_musb_ops;
 	pdata.config		= &sunxi_musb_hdrc_config;
 
-	glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
-	if (!glue)
-		return -ENOMEM;
-
 	glue->dev = &pdev->dev;
 	INIT_WORK(&glue->work, sunxi_musb_work);
 	glue->host_nb.notifier_call = sunxi_musb_host_notifier;
-- 
2.7.4

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