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From: Nagarjuna Kristam <nkristam@nvidia.com>
To: Thierry Reding <thierry.reding@gmail.com>
Cc: <balbi@kernel.org>, <gregkh@linuxfoundation.org>,
	<jonathanh@nvidia.com>, <mark.rutland@arm.com>,
	<robh+dt@kernel.org>, <kishon@ti.com>,
	<devicetree@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
	<linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 03/18] phy: tegra: xusb: Add usb-role-switch support
Date: Tue, 10 Dec 2019 09:22:23 +0530	[thread overview]
Message-ID: <9ce40f6c-e742-79f0-ee99-517571c46bc3@nvidia.com> (raw)
In-Reply-To: <20191206145445.GD2085684@ulmo>



On 06-12-2019 20:24, Thierry Reding wrote:
> On Fri, Dec 06, 2019 at 04:20:06PM +0530, Nagarjuna Kristam wrote:
>> If usb-role-switch property is present in USB 2 port, register
>> usb-role-switch to receive usb role changes.
>>
>> Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
>> ---
>>  drivers/phy/tegra/Kconfig |  1 +
>>  drivers/phy/tegra/xusb.c  | 40 ++++++++++++++++++++++++++++++++++++++++
>>  drivers/phy/tegra/xusb.h  |  3 +++
>>  3 files changed, 44 insertions(+)
>>
>> diff --git a/drivers/phy/tegra/Kconfig b/drivers/phy/tegra/Kconfig
>> index f9817c3..df07c4d 100644
>> --- a/drivers/phy/tegra/Kconfig
>> +++ b/drivers/phy/tegra/Kconfig
>> @@ -2,6 +2,7 @@
>>  config PHY_TEGRA_XUSB
>>  	tristate "NVIDIA Tegra XUSB pad controller driver"
>>  	depends on ARCH_TEGRA
>> +	select USB_CONN_GPIO
>>  	help
>>  	  Choose this option if you have an NVIDIA Tegra SoC.
>>  
>> diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
>> index f98ec39..da60a63 100644
>> --- a/drivers/phy/tegra/xusb.c
>> +++ b/drivers/phy/tegra/xusb.c
>> @@ -523,6 +523,7 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,
>>  	port->dev.type = &tegra_xusb_port_type;
>>  	port->dev.of_node = of_node_get(np);
>>  	port->dev.parent = padctl->dev;
>> +	port->dev.driver = padctl->dev->driver;
>>  
>>  	err = dev_set_name(&port->dev, "%s-%u", name, index);
>>  	if (err < 0)
>> @@ -532,6 +533,7 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,
>>  	if (err < 0)
>>  		goto unregister;
>>  
>> +	dev_set_drvdata(&port->dev, port);
> You never seem to use dev_get_drvdata() to get at this. Also, you can
> get at it via container_of(), so this is only marginally useful to begin
> with.
> 
Its actually used in API tegra_xusb_role_sw_set, but thats in patch 0004.
Will move this line to 0004 patch to align with the usage.

>>  	return 0;
>>  
>>  unregister:
>> @@ -541,6 +543,7 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,
>>  
>>  static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
>>  {
>> +	usb_role_switch_unregister(port->usb_role_sw);
>>  	device_unregister(&port->dev);
>>  }
>>  
>> @@ -551,11 +554,39 @@ static const char *const modes[] = {
>>  	[USB_DR_MODE_OTG] = "otg",
>>  };
>>  
>> +static int tegra_xusb_role_sw_set(struct device *dev, enum usb_role role)
>> +{
>> +	dev_dbg(dev, "%s calling notifier for role is %d\n", __func__, role);
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_xusb_setup_usb_role_switch(struct tegra_xusb_port *port)
>> +{
>> +	int err = 0;
>> +	struct usb_role_switch_desc role_sx_desc = {
>> +					.set = tegra_xusb_role_sw_set,
>> +					.fwnode = dev_fwnode(&port->dev),
>> +						   };
>> +
>> +	port->usb_role_sw = usb_role_switch_register(&port->dev,
>> +						&role_sx_desc);
>> +	if (IS_ERR(port->usb_role_sw)) {
>> +		err = PTR_ERR(port->usb_role_sw);
>> +		if (err != EPROBE_DEFER)
>> +			dev_err(&port->dev, "Failed to register USB role SW: %d",
>> +				err);
>> +	}
>> +
>> +	return err;
>> +}
>> +
>>  static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
>>  {
>>  	struct tegra_xusb_port *port = &usb2->base;
>>  	struct device_node *np = port->dev.of_node;
>>  	const char *mode;
>> +	int err;
>>  
>>  	usb2->internal = of_property_read_bool(np, "nvidia,internal");
>>  
>> @@ -572,6 +603,15 @@ static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
>>  		usb2->mode = USB_DR_MODE_HOST;
>>  	}
>>  
>> +	if (of_property_read_bool(np, "usb-role-switch")) {
>> +		/* populate connector entry */
>> +		of_platform_populate(np, NULL, NULL, &port->dev);
> I think we want to clean this up on failure, don't we? Otherwise we
> might end up trying to register the same platform device multiple times.
> Also, do we want to depopulate when the port is removed again?
> 
> Have you tried unloading and loading the driver to see if that works?
> 
> Thierry
> 
platform needs to be depopulate on error/remove and will add corresponding code.
padctl driver can be unloaded after unloading all dependent drivers. re-loading
caused failure of usb role switch due to missing depopulate. Will update changes
to consider the same.

Thanks,
Nagarjuna
>> +
>> +		err = tegra_xusb_setup_usb_role_switch(port);
>> +		if (err < 0)
>> +			return err;
>> +	}
>> +
>>  	usb2->supply = devm_regulator_get(&port->dev, "vbus");
>>  	return PTR_ERR_OR_ZERO(usb2->supply);
>>  }
>> diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
>> index da94fcc..9f27899 100644
>> --- a/drivers/phy/tegra/xusb.h
>> +++ b/drivers/phy/tegra/xusb.h
>> @@ -12,6 +12,7 @@
>>  #include <linux/workqueue.h>
>>  
>>  #include <linux/usb/otg.h>
>> +#include <linux/usb/role.h>
>>  
>>  /* legacy entry points for backwards-compatibility */
>>  int tegra_xusb_padctl_legacy_probe(struct platform_device *pdev);
>> @@ -266,6 +267,8 @@ struct tegra_xusb_port {
>>  	struct list_head list;
>>  	struct device dev;
>>  
>> +	struct usb_role_switch *usb_role_sw;
>> +
>>  	const struct tegra_xusb_port_ops *ops;
>>  };
>>  
>> -- 
>> 2.7.4
>>

  reply	other threads:[~2019-12-10  3:50 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-06 10:50 [PATCH 00/18] Tegra XUSB OTG support Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 01/18] dt-bindings: phy: tegra-xusb: Add usb-role-switch Nagarjuna Kristam
2019-12-06 14:49   ` Thierry Reding
2019-12-09  4:45     ` Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 02/18] dt-bindings: usb: Add NVIDIA Tegra XUSB device mode controller binding Nagarjuna Kristam
2019-12-13 18:45   ` Rob Herring
2019-12-16  6:30     ` Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 03/18] phy: tegra: xusb: Add usb-role-switch support Nagarjuna Kristam
2019-12-06 14:54   ` Thierry Reding
2019-12-10  3:52     ` Nagarjuna Kristam [this message]
2019-12-06 10:50 ` [PATCH 04/18] phy: tegra: xusb: Add usb-phy support Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 05/18] phy: tegra: xusb: Add support to get companion USB 3 port Nagarjuna Kristam
2019-12-06 14:57   ` Thierry Reding
2019-12-09  6:27     ` Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 06/18] phy: tegra: xusb: Add set_mode support for USB 2 phy on Tegra210 Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 07/18] phy: tegra: xusb: Add set_mode support for utmi phy on Tegra186 Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 08/18] usb: xhci-tegra: Add OTG support Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 09/18] usb: gadget: tegra-xudc: Remove usb-role-switch support Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 10/18] usb: gadget: tegra-xudc: Add usb-phy support Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 11/18] usb: gadget: tegra-xudc: use phy_set_mode to set/unset device mode Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 12/18] usb: gadget: tegra-xudc: support multiple device modes Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 13/18] arm64: tegra: update OTG port entries for jetson-tx1 Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 14/18] arm64: tegra: update OTG port entries for jetson-tx2 Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 15/18] arm64: tegra: Add xudc node for Tegra210 Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 16/18] arm64: tegra: Enable xudc on Jetson TX1 Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 17/18] arm64: tegra: Add xudc node for Tegra186 Nagarjuna Kristam
2019-12-06 10:50 ` [PATCH 18/18] arm64: tegra: Enable xudc node on Jetson TX2 Nagarjuna Kristam

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