Re: [PATCH v4 1/2] phy-sun4i-usb: Add full support for usb0 phy / OTG

Chanwoo Choi
2015-06-11T08:07:02Z

Hi Hans,

I add the comment about extcon-related code.

Firstly,
I'd like you to implment the extcon driver for phy-sun4i-usb device
in drivers/extcon/ directoryby using MFD because there are both extcon
provider driver and extcon client driver. I think that all extcon
provider driver better to be included in drivers/extcon/ directory.
extcon_set_cable_state() function should be handled in extcon provider
driver which is incluced in drivers/extcon/ directory.

On 06/11/2015 02:48 PM, Kishon Vijay Abraham I wrote:
> +Chanwoo
>
> Hi,
>
> On Sunday 31 May 2015 09:40 PM, Hans de Goede wrote:
>> The usb0 phy is connected to an OTG controller, and as such needs some special
>> handling:
>>
>> 1) It allows explicit control over the pullups, enable these on phy_init and
>> disable them on phy_exit.
>>
>> 2) It has bits to signal id and vbus detect to the musb-core, add support for
>> for monitoring id and vbus detect gpio-s for use in dual role mode, and set
>> these bits to the correct values for operating in host only mode when no
>> gpios are specified in the devicetree.
>>
>> 3) When in dual role mode the musb sunxi glue needs to know if the a host or
>> device cable is plugged in, so when in dual role mode register an extcon.
>>
>> While updating the devicetree binding documentation also add documentation
>> for the sofar undocumented usage of regulators for vbus for all 3 phys.
>>
>> Signed-off-by: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> ---
>> Changes in v2:
>> -Removed the sunxi specific phy functions, instead the id / vbus gpio polling
>> has been moved to the phy-sun4i-usb driver and their status is exported
>> through extcon for the sunxi-musb glue
>> Changes in v3:
>> -No changes
>> Changes in v4:
>> -Do not call regulator_disable in an unbalanced manner when an external vbus
>> is present
>> ---
>> .../devicetree/bindings/phy/sun4i-usb-phy.txt | 18 +-
>> drivers/phy/Kconfig | 1 +
>> drivers/phy/phy-sun4i-usb.c | 273 ++++++++++++++++++++-
>> 3 files changed, 281 insertions(+), 11 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> index 16528b9..557fa99 100644
>> --- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> +++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
>> @@ -23,6 +23,13 @@ Required properties:
>> * "usb1_reset"
>> * "usb2_reset" for sun4i, sun6i or sun7i
>>
>> +Optional properties:
>> +- usb0_id_det-gpios : gpio phandle for reading the otg id pin value
>> +- usb0_vbus_det-gpios : gpio phandle for detecting the presence of usb0 vbus
>> +- 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
>> +
>> Example:
>> usbphy: phy@0x01c13400 {
>> #phy-cells = <1>;
>> @@ -32,6 +39,13 @@ Example:
>> reg-names = "phy_ctrl", "pmu1", "pmu2";
>> clocks = <&usb_clk 8>;
>> clock-names = "usb_phy";
>> - resets = <&usb_clk 1>, <&usb_clk 2>;
>> - reset-names = "usb1_reset", "usb2_reset";
>> + resets = <&usb_clk 0>, <&usb_clk 1>, <&usb_clk 2>;
>> + reset-names = "usb0_reset", "usb1_reset", "usb2_reset";
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&usb0_id_detect_pin>, <&usb0_vbus_detect_pin>;
>> + usb0_id_det-gpios = <&pio 7 19 GPIO_ACTIVE_HIGH>; /* PH19 */
>> + usb0_vbus_det-gpios = <&pio 7 22 GPIO_ACTIVE_HIGH>; /* PH22 */
>> + usb0_vbus-supply = <&reg_usb0_vbus>;
>> + usb1_vbus-supply = <&reg_usb1_vbus>;
>> + usb2_vbus-supply = <&reg_usb2_vbus>;
>> };
>> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> index a53bd5b..4614fba 100644
>> --- a/drivers/phy/Kconfig
>> +++ b/drivers/phy/Kconfig
>> @@ -173,6 +173,7 @@ config PHY_SUN4I_USB
>> tristate "Allwinner sunxi SoC USB PHY driver"
>> depends on ARCH_SUNXI && HAS_IOMEM && OF
>> depends on RESET_CONTROLLER
>> + select EXTCON
>
> Avoid using 'select' on visible Kconfig symbols.
>
> Also please split the patch to make the reviewing a bit easier.
>
> Thanks
> Kishon
>> select GENERIC_PHY
>> help
>> Enable this to support the transceiver that is part of Allwinner
>> diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
>> index 91c5be4..b45d707 100644
>> --- a/drivers/phy/phy-sun4i-usb.c
>> +++ b/drivers/phy/phy-sun4i-usb.c
>> @@ -1,7 +1,7 @@
>> /*
>> * Allwinner sun4i USB phy driver
>> *
>> - * Copyright (C) 2014 Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> + * Copyright (C) 2014-2015 Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>> *
>> * Based on code from
>> * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
>> @@ -23,17 +23,23 @@
>>
>> #include <linux/clk.h>
>> #include <linux/err.h>
>> +#include <linux/extcon.h>
>> #include <linux/io.h>
>> +#include <linux/interrupt.h>
>> #include <linux/kernel.h>
>> #include <linux/module.h>
>> #include <linux/mutex.h>
>> #include <linux/of.h>
>> #include <linux/of_address.h>
>> +#include <linux/of_gpio.h>
>> #include <linux/phy/phy.h>
>> #include <linux/phy/phy-sun4i-usb.h>
>> #include <linux/platform_device.h>
>> #include <linux/regulator/consumer.h>
>> #include <linux/reset.h>
>> +#include <linux/workqueue.h>
>> +
>> +#define DRIVER_NAME "sun4i-usb-phy"
>>
>> #define REG_ISCR 0x00
>> #define REG_PHYCTL 0x04
>> @@ -47,6 +53,17 @@
>> #define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)
>> #define SUNXI_ULPI_BYPASS_EN BIT(0)
>>
>> +/* ISCR, Interface Status and Control bits */
>> +#define ISCR_ID_PULLUP_EN (1 << 17)
>> +#define ISCR_DPDM_PULLUP_EN (1 << 16)
>> +/* sunxi has the phy id/vbus pins not connected, so we use the force bits */
>> +#define ISCR_FORCE_ID_MASK (3 << 14)
>> +#define ISCR_FORCE_ID_LOW (2 << 14)
>> +#define ISCR_FORCE_ID_HIGH (3 << 14)
>> +#define ISCR_FORCE_VBUS_MASK (3 << 12)
>> +#define ISCR_FORCE_VBUS_LOW (2 << 12)
>> +#define ISCR_FORCE_VBUS_HIGH (3 << 12)
>> +
>> /* Common Control Bits for Both PHYs */
>> #define PHY_PLL_BW 0x03
>> #define PHY_RES45_CAL_EN 0x0c
>> @@ -63,6 +80,13 @@
>>
>> #define MAX_PHYS 3
>>
>> +/*
>> + * Note do not raise the debounce time, we must report Vusb high within 100ms
>> + * otherwise we get Vbus errors
>> + */
>> +#define DEBOUNCE_TIME msecs_to_jiffies(50)
>> +#define POLL_TIME msecs_to_jiffies(250)
>> +
>> struct sun4i_usb_phy_data {
>> void __iomem *base;
>> struct mutex mutex;
>> @@ -74,13 +98,58 @@ struct sun4i_usb_phy_data {
>> struct regulator *vbus;
>> struct reset_control *reset;
>> struct clk *clk;
>> + bool regulator_on;
>> int index;
>> } phys[MAX_PHYS];
>> + /* phy0 / otg related variables */
>> + struct extcon_dev extcon;
>> + const char *extcon_cable_names[3];

The latest extcon use the unique id to indicate the each external connector
instead of legacy string. The related patch[1] and patch[2] will be merged on v4.2-rc1.

[1] extcon: Use the unique id for external connector instead of string
- http://git.kernel.org/cgit/linux/kernel/git/gregkh/char-misc.git/commit/?h=char-misc-next&id=2a9de9c0f08d61fbe3764a21d22d0b72df97d6ae
[2] extcon: Redefine the unique id of supported external connectors without 'enum extcon' type
- http://git.kernel.org/cgit/linux/kernel/git/chanwoo/extcon.git/commit/?h=extcon-next-v4.3&id=bbd8d8b4244bb2799143c959fde57b1f034ec838

For exmaple in drivers/extcon/extcon-usb-gpio.c:
Maybe you can add the similiar array which include the supported external connector.

static const unsigned int usb_extcon_cable[] = {
EXTCON_USB,
EXTCON_USB_HOST,
EXTCON_NONE,
};

>> + bool phy0_init;
>> + bool phy0_poll;
>> + struct gpio_desc *id_det_gpio;
>> + struct gpio_desc *vbus_det_gpio;
>> + int id_det_irq;
>> + int vbus_det_irq;
>> + int id_det;
>> + int vbus_det;
>> + struct delayed_work detect;
>> };
>>
>> #define to_sun4i_usb_phy_data(phy) \
>> container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index])
>>
>> +static void sun4i_usb_phy0_update_iscr(struct phy *_phy, u32 clr, u32 set)
>> +{
>> + struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
>> + struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
>> + u32 iscr;
>> +
>> + iscr = readl(data->base + REG_ISCR);
>> + iscr &= ~clr;
>> + iscr |= set;
>> + writel(iscr, data->base + REG_ISCR);
>> +}
>> +
>> +static void sun4i_usb_phy0_set_id_detect(struct phy *phy, u32 val)
>> +{
>> + if (val)
>> + val = ISCR_FORCE_ID_HIGH;
>> + else
>> + val = ISCR_FORCE_ID_LOW;
>> +
>> + sun4i_usb_phy0_update_iscr(phy, ISCR_FORCE_ID_MASK, val);
>> +}
>> +
>> +static void sun4i_usb_phy0_set_vbus_detect(struct phy *phy, u32 val)
>> +{
>> + if (val)
>> + val = ISCR_FORCE_VBUS_HIGH;
>> + else
>> + val = ISCR_FORCE_VBUS_LOW;
>> +
>> + sun4i_usb_phy0_update_iscr(phy, ISCR_FORCE_VBUS_MASK, val);
>> +}
>> +
>> static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data,
>> int len)
>> {
>> @@ -171,12 +240,39 @@ static int sun4i_usb_phy_init(struct phy *_phy)
>>
>> sun4i_usb_phy_passby(phy, 1);
>>
>> + if (phy->index == 0) {
>> + data->phy0_init = true;
>> +
>> + /* Enable pull-ups */
>> + sun4i_usb_phy0_update_iscr(_phy, 0, ISCR_DPDM_PULLUP_EN);
>> + sun4i_usb_phy0_update_iscr(_phy, 0, ISCR_ID_PULLUP_EN);
>> +
>> + if (data->id_det_gpio) {
>> + /* OTG mode, force ISCR and cable state updates */
>> + data->id_det = -1;
>> + data->vbus_det = -1;
>> + queue_delayed_work(system_wq, &data->detect, 0);
>> + } else {
>> + /* Host only mode */
>> + sun4i_usb_phy0_set_id_detect(_phy, 0);
>> + sun4i_usb_phy0_set_vbus_detect(_phy, 1);
>> + }
>> + }
>> +
>> return 0;
>> }
>>
>> static int sun4i_usb_phy_exit(struct phy *_phy)
>> {
>> 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) {
>> + /* Disable pull-ups */
>> + sun4i_usb_phy0_update_iscr(_phy, ISCR_DPDM_PULLUP_EN, 0);
>> + sun4i_usb_phy0_update_iscr(_phy, ISCR_ID_PULLUP_EN, 0);
>> + data->phy0_init = false;
>> + }
>>
>> sun4i_usb_phy_passby(phy, 0);
>> reset_control_assert(phy->reset);
>> @@ -188,20 +284,46 @@ static int sun4i_usb_phy_exit(struct phy *_phy)
>> static int sun4i_usb_phy_power_on(struct phy *_phy)
>> {
>> struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
>> - int ret = 0;
>> + struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
>> + int ret;
>> +
>> + if (!phy->vbus || phy->regulator_on)
>> + return 0;
>> +
>> + /* For phy0 only turn on Vbus if we don't have an ext. Vbus */
>> + if (phy->index == 0 && data->vbus_det)
>> + return 0;
>>
>> - if (phy->vbus)
>> - ret = regulator_enable(phy->vbus);
>> + ret = regulator_enable(phy->vbus);
>> + if (ret)
>> + return ret;
>>
>> - return ret;
>> + phy->regulator_on = true;
>> +
>> + /* We must report Vbus high within OTG_TIME_A_WAIT_VRISE msec. */
>> + if (phy->index == 0 && data->phy0_poll)
>> + mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
>> +
>> + return 0;
>> }
>>
>> static int sun4i_usb_phy_power_off(struct phy *_phy)
>> {
>> struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
>> + struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
>> +
>> + if (!phy->vbus || !phy->regulator_on)
>> + return 0;
>>
>> - if (phy->vbus)
>> - regulator_disable(phy->vbus);
>> + regulator_disable(phy->vbus);
>> + phy->regulator_on = false;
>> +
>> + /*
>> + * phy0 vbus typically slowly discharges, sometimes this causes the
>> + * Vbus gpio to not trigger an edge irq on Vbus off, so force a rescan.
>> + */
>> + if (phy->index == 0 && !data->phy0_poll)
>> + mod_delayed_work(system_wq, &data->detect, POLL_TIME);
>>
>> return 0;
>> }
>> @@ -221,6 +343,61 @@ static struct phy_ops sun4i_usb_phy_ops = {
>> .owner = THIS_MODULE,
>> };
>>
>> +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;
>> +
>> + id_det = gpiod_get_value_cansleep(data->id_det_gpio);
>> + vbus_det = gpiod_get_value_cansleep(data->vbus_det_gpio);
>> +
>> + mutex_lock(&phy0->mutex);
>> +
>> + if (!data->phy0_init) {
>> + mutex_unlock(&phy0->mutex);
>> + return;
>> + }
>> +
>> + if (id_det != data->id_det) {
>> + sun4i_usb_phy0_set_id_detect(phy0, id_det);
>> + data->id_det = id_det;
>> + id_notify = 1;
>> + }
>> +
>> + if (vbus_det != data->vbus_det) {
>> + sun4i_usb_phy0_set_vbus_detect(phy0, vbus_det);
>> + data->vbus_det = vbus_det;
>> + vbus_notify = 1;
>> + }
>> +
>> + mutex_unlock(&phy0->mutex);
>> +
>> + if (id_notify)
>> + extcon_set_cable_state(&data->extcon,
>> + extcon_cable_name[EXTCON_USB_HOST],
>> + !id_det);
>> +
>> + if (vbus_notify)
>> + extcon_set_cable_state(&data->extcon,
>> + extcon_cable_name[EXTCON_USB],
>> + vbus_det);

I don't want to use the legacy extcon API with string name.
Instead, you can use the recommeded extcon_set_cable_state_() API as following:

- Legacy extcon API
: extern int extcon_set_cable_state(struct extcon_dev *edev,
const char *cable_name, bool cable_state);
- Recommended extcon API
: extern int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
bool cable_state);

[1] extcon: Use the unique id for external connector instead of string
- http://git.kernel.org/cgit/linux/kernel/git/gregkh/char-misc.git/commit/?h=char-misc-next&id=2a9de9c0f08d61fbe3764a21d22d0b72df97d6ae

>> +
>> + if (data->phy0_poll)
>> + queue_delayed_work(system_wq, &data->detect, POLL_TIME);
>> +}
>> +
>> +static irqreturn_t sun4i_usb_phy0_id_vbus_det_irq(int irq, void *dev_id)
>> +{
>> + struct sun4i_usb_phy_data *data = dev_id;
>> +
>> + /* vbus or id changed, let the pins settle and then scan them */
>> + mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> static struct phy *sun4i_usb_phy_xlate(struct device *dev,
>> struct of_phandle_args *args)
>> {
>> @@ -240,13 +417,20 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>> struct phy_provider *phy_provider;
>> bool dedicated_clocks;
>> struct resource *res;
>> - int i;
>> + int i, ret;
>>
>> data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
>> if (!data)
>> return -ENOMEM;
>>
>> mutex_init(&data->mutex);
>> + INIT_DELAYED_WORK(&data->detect, sun4i_usb_phy0_id_vbus_det_scan);
>> + data->extcon_cable_names[0] = extcon_cable_name[EXTCON_USB_HOST];
>> + data->extcon_cable_names[1] = extcon_cable_name[EXTCON_USB];
>> + data->extcon_cable_names[2] = NULL;
>> + data->extcon.name = DRIVER_NAME;

Don't need it because extcon_dev_register() set the device name automatically.
You can check it on patch[3].
[3] http://git.kernel.org/cgit/linux/kernel/git/gregkh/char-misc.git/commit/?h=char-misc-next&id=71c3ffa5d23af0554c27010cf12710da9bf85950

>> + data->extcon.supported_cable = data->extcon_cable_names;

You can use the devm_extcon_dev_allocate() to set the supported external connectors.

>> + data->extcon.dev.parent = dev;

Don't need it because extcon_dev_register() set the parent device automatically.

The field of 'struct extcon_dev' shold be filled with extcon API without direct allocation.

>>
>> if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy"))
>> data->num_phys = 2;
>> @@ -269,6 +453,34 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>> if (IS_ERR(data->base))
>> return PTR_ERR(data->base);
>>
>> + data->id_det_gpio = devm_gpiod_get(dev, "usb0_id_det", GPIOD_IN);
>> + if (IS_ERR(data->id_det_gpio)) {
>> + if (PTR_ERR(data->id_det_gpio) == -EPROBE_DEFER)
>> + return -EPROBE_DEFER;
>> + data->id_det_gpio = NULL;
>> + }
>> +
>> + data->vbus_det_gpio = devm_gpiod_get(dev, "usb0_vbus_det", GPIOD_IN);
>> + if (IS_ERR(data->vbus_det_gpio)) {
>> + if (PTR_ERR(data->vbus_det_gpio) == -EPROBE_DEFER)
>> + return -EPROBE_DEFER;
>> + data->vbus_det_gpio = NULL;
>> + }
>> +
>> + /* We either want both gpio pins or neither (when in host mode) */
>> + if (!data->id_det_gpio != !data->vbus_det_gpio) {
>> + dev_err(dev, "failed to get id or vbus detect pin\n");
>> + return -ENODEV;
>> + }
>> +
>> + if (data->id_det_gpio) {
>> + ret = devm_extcon_dev_register(dev, &data->extcon);
>> + if (ret) {
>> + dev_err(dev, "failed to register extcon: %d\n", ret);
>> + return ret;
>> + }
>> + }
>> +
>> for (i = 0; i < data->num_phys; i++) {
>> struct sun4i_usb_phy *phy = data->phys + i;
>> char name[16];
>> @@ -318,12 +530,54 @@ static int sun4i_usb_phy_probe(struct platform_device *pdev)
>> phy_set_drvdata(phy->phy, &data->phys[i]);
>> }
>>
>> + data->id_det_irq = gpiod_to_irq(data->id_det_gpio);
>> + data->vbus_det_irq = gpiod_to_irq(data->vbus_det_gpio);
>> + if (data->id_det_irq < 0 || data->vbus_det_irq < 0)
>> + data->phy0_poll = true;
>> +
>> + if (data->id_det_irq >= 0) {
>> + ret = devm_request_irq(dev, data->id_det_irq,
>> + sun4i_usb_phy0_id_vbus_det_irq,
>> + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
>> + "usb0-id-det", data);
>> + if (ret) {
>> + dev_err(dev, "Err requesting id-det-irq: %d\n", ret);
>> + return ret;
>> + }
>> + }
>> +
>> + if (data->vbus_det_irq >= 0) {
>> + ret = devm_request_irq(dev, data->vbus_det_irq,
>> + sun4i_usb_phy0_id_vbus_det_irq,
>> + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
>> + "usb0-vbus-det", data);
>> + if (ret) {
>> + dev_err(dev, "Err requesting vbus-det-irq: %d\n", ret);
>> + return ret;
>> + }
>> + }
>> +
>> dev_set_drvdata(dev, data);
>> phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate);
>>
>> return PTR_ERR_OR_ZERO(phy_provider);
>> }
>>
>> +static int sun4i_usb_phy_remove(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
>> +
>> + if (data->id_det_irq >= 0)
>> + devm_free_irq(dev, data->id_det_irq, data);
>> + if (data->vbus_det_irq >= 0)
>> + devm_free_irq(dev, data->vbus_det_irq, data);
>> +
>> + cancel_delayed_work_sync(&data->detect);
>> +
>> + return 0;
>> +}
>> +
>> static const struct of_device_id sun4i_usb_phy_of_match[] = {
>> { .compatible = "allwinner,sun4i-a10-usb-phy" },
>> { .compatible = "allwinner,sun5i-a13-usb-phy" },
>> @@ -335,9 +589,10 @@ MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
>>
>> static struct platform_driver sun4i_usb_phy_driver = {
>> .probe = sun4i_usb_phy_probe,
>> + .remove = sun4i_usb_phy_remove,
>> .driver = {
>> .of_match_table = sun4i_usb_phy_of_match,
>> - .name = "sun4i-usb-phy",
>> + .name = DRIVER_NAME,
>> }
>> };
>> module_platform_driver(sun4i_usb_phy_driver);
>>
>

Thanks,
Chanwoo Choi

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