[v2,3/8] usb: chipidea: Add support for Tegra20/30/114/124

Message ID f103baa439a64b517e6c8cb51c30e81987dfedb3.1501173271.git.digetx@gmail.com
State Superseded
Headers show

Commit Message

Dmitry Osipenko July 27, 2017, 4:46 p.m.
From: Thierry Reding <treding@nvidia.com>

All of these Tegra SoC generations have a ChipIdea UDC IP block that can
be used for device mode communication with a host. Implement rudimentary
support that doesn't allow switching between host and device modes.

Signed-off-by: Thierry Reding <treding@nvidia.com>
[digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Acked-by: Peter Chen <peter.chen@nxp.com>
---
 drivers/usb/chipidea/Makefile        |   1 +
 drivers/usb/chipidea/ci_hdrc_tegra.c | 160 +++++++++++++++++++++++++++++++++++
 2 files changed, 161 insertions(+)
 create mode 100644 drivers/usb/chipidea/ci_hdrc_tegra.c

Comments

Michał Mirosław July 27, 2017, 10:32 p.m. | #1
On Thu, Jul 27, 2017 at 07:46:07PM +0300, Dmitry Osipenko wrote:
> From: Thierry Reding <treding@nvidia.com>
> 
> All of these Tegra SoC generations have a ChipIdea UDC IP block that can
> be used for device mode communication with a host. Implement rudimentary
> support that doesn't allow switching between host and device modes.
> 
> Signed-off-by: Thierry Reding <treding@nvidia.com>
> [digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> Acked-by: Peter Chen <peter.chen@nxp.com>

This works on my Asus TF300T (Tegra3 device). Minor nit below.

Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> (on tf300t)

[...]
> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> new file mode 100644
> index 000000000000..7814500e71fa
> --- /dev/null
> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> @@ -0,0 +1,160 @@
[...]
> +struct tegra_udc_soc_info {
> +	bool supports_unaligned_dma;
> +};
[...]
> +static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
> +	.supports_unaligned_dma = false,
> +};
> +
> +static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
> +	.supports_unaligned_dma = true,
> +};
> +
> +static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
> +	.supports_unaligned_dma = true,
> +};
> +
> +static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
> +	.supports_unaligned_dma = true,
> +};
> +
> +static const struct of_device_id tegra_udc_of_match[] = {
> +	{
> +		.compatible = "nvidia,tegra20-udc",
> +		.data = &tegra20_udc_soc_info,
> +	}, {
> +		.compatible = "nvidia,tegra30-udc",
> +		.data = &tegra30_udc_soc_info,
> +	}, {
> +		.compatible = "nvidia,tegra114-udc",
> +		.data = &tegra114_udc_soc_info,
> +	}, {
> +		.compatible = "nvidia,tegra124-udc",
> +		.data = &tegra124_udc_soc_info,
> +	}, {
> +		/* sentinel */
> +	}
> +};
> +MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
[...]
> +static int tegra_udc_probe(struct platform_device *pdev)
> +{
[...]
> +	/* setup device specific quirks */
> +	soc = id->data;
> +
> +	if (!soc->supports_unaligned_dma)
> +		udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
[...]

Some lines would be saved if this was just:

udc->data.flags |= id->data;

Best Regards,
Michał Mirosław
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Dmitry Osipenko July 28, 2017, 10 a.m. | #2
On 28.07.2017 01:32, Michał Mirosław wrote:
> On Thu, Jul 27, 2017 at 07:46:07PM +0300, Dmitry Osipenko wrote:
>> From: Thierry Reding <treding@nvidia.com>
>>
>> All of these Tegra SoC generations have a ChipIdea UDC IP block that can
>> be used for device mode communication with a host. Implement rudimentary
>> support that doesn't allow switching between host and device modes.
>>
>> Signed-off-by: Thierry Reding <treding@nvidia.com>
>> [digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>> Acked-by: Peter Chen <peter.chen@nxp.com>
> 
> This works on my Asus TF300T (Tegra3 device). Minor nit below.
> 
> Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> (on tf300t)
> 

Nice, thank you!

> [...]
>> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
>> new file mode 100644
>> index 000000000000..7814500e71fa
>> --- /dev/null
>> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
>> @@ -0,0 +1,160 @@
> [...]
>> +struct tegra_udc_soc_info {
>> +	bool supports_unaligned_dma;
>> +};
> [...]
>> +static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
>> +	.supports_unaligned_dma = false,
>> +};
>> +
>> +static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
>> +	.supports_unaligned_dma = true,
>> +};
>> +
>> +static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
>> +	.supports_unaligned_dma = true,
>> +};
>> +
>> +static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
>> +	.supports_unaligned_dma = true,
>> +};
>> +
>> +static const struct of_device_id tegra_udc_of_match[] = {
>> +	{
>> +		.compatible = "nvidia,tegra20-udc",
>> +		.data = &tegra20_udc_soc_info,
>> +	}, {
>> +		.compatible = "nvidia,tegra30-udc",
>> +		.data = &tegra30_udc_soc_info,
>> +	}, {
>> +		.compatible = "nvidia,tegra114-udc",
>> +		.data = &tegra114_udc_soc_info,
>> +	}, {
>> +		.compatible = "nvidia,tegra124-udc",
>> +		.data = &tegra124_udc_soc_info,
>> +	}, {
>> +		/* sentinel */
>> +	}
>> +};
>> +MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
> [...]
>> +static int tegra_udc_probe(struct platform_device *pdev)
>> +{
> [...]
>> +	/* setup device specific quirks */
>> +	soc = id->data;
>> +
>> +	if (!soc->supports_unaligned_dma)
>> +		udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
> [...]
> 
> Some lines would be saved if this was just:
> 
> udc->data.flags |= id->data;
> 

I think a verbose approach is more preferable and it also more future proof
since we may extend soc_info with other stuff later.
Michał Mirosław July 28, 2017, 3:51 p.m. | #3
On Fri, Jul 28, 2017 at 01:00:32PM +0300, Dmitry Osipenko wrote:
> On 28.07.2017 01:32, Michał Mirosław wrote:
> > On Thu, Jul 27, 2017 at 07:46:07PM +0300, Dmitry Osipenko wrote:
> >> From: Thierry Reding <treding@nvidia.com>
> >>
> >> All of these Tegra SoC generations have a ChipIdea UDC IP block that can
> >> be used for device mode communication with a host. Implement rudimentary
> >> support that doesn't allow switching between host and device modes.
> >>
> >> Signed-off-by: Thierry Reding <treding@nvidia.com>
> >> [digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
> >> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> >> Acked-by: Peter Chen <peter.chen@nxp.com>
> > 
> > This works on my Asus TF300T (Tegra3 device). Minor nit below.
> > 
> > Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> (on tf300t)
> > 
> 
> Nice, thank you!
> 
> > [...]
> >> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> >> new file mode 100644
> >> index 000000000000..7814500e71fa
> >> --- /dev/null
> >> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> >> @@ -0,0 +1,160 @@
> > [...]
> >> +struct tegra_udc_soc_info {
> >> +	bool supports_unaligned_dma;
> >> +};
> > [...]
> >> +static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
> >> +	.supports_unaligned_dma = false,
> >> +};
> >> +
> >> +static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
> >> +	.supports_unaligned_dma = true,
> >> +};
> >> +
> >> +static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
> >> +	.supports_unaligned_dma = true,
> >> +};
> >> +
> >> +static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
> >> +	.supports_unaligned_dma = true,
> >> +};
> >> +
> >> +static const struct of_device_id tegra_udc_of_match[] = {
> >> +	{
> >> +		.compatible = "nvidia,tegra20-udc",
> >> +		.data = &tegra20_udc_soc_info,
> >> +	}, {
> >> +		.compatible = "nvidia,tegra30-udc",
> >> +		.data = &tegra30_udc_soc_info,
> >> +	}, {
> >> +		.compatible = "nvidia,tegra114-udc",
> >> +		.data = &tegra114_udc_soc_info,
> >> +	}, {
> >> +		.compatible = "nvidia,tegra124-udc",
> >> +		.data = &tegra124_udc_soc_info,
> >> +	}, {
> >> +		/* sentinel */
> >> +	}
> >> +};
> >> +MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
> > [...]
> >> +static int tegra_udc_probe(struct platform_device *pdev)
> >> +{
> > [...]
> >> +	/* setup device specific quirks */
> >> +	soc = id->data;
> >> +
> >> +	if (!soc->supports_unaligned_dma)
> >> +		udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
> > [...]
> > 
> > Some lines would be saved if this was just:
> > 
> > udc->data.flags |= id->data;
> > 
> 
> I think a verbose approach is more preferable and it also more future proof
> since we may extend soc_info with other stuff later.

I would just leave that to be done when it's needed. :-)

Or you could just have udc_flags in struct tegra_udc_soc_info, so
that it would not need to be translated - again saving code, bugs
and future developers' time.

Best Regards,
Michał Mirosław
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Peter Chen July 31, 2017, 1:14 a.m. | #4
On Fri, Jul 28, 2017 at 05:51:16PM +0200, Michał Mirosław wrote:
> On Fri, Jul 28, 2017 at 01:00:32PM +0300, Dmitry Osipenko wrote:
> > On 28.07.2017 01:32, Michał Mirosław wrote:
> > > On Thu, Jul 27, 2017 at 07:46:07PM +0300, Dmitry Osipenko wrote:
> > >> From: Thierry Reding <treding@nvidia.com>
> > >>
> > >> All of these Tegra SoC generations have a ChipIdea UDC IP block that can
> > >> be used for device mode communication with a host. Implement rudimentary
> > >> support that doesn't allow switching between host and device modes.
> > >>
> > >> Signed-off-by: Thierry Reding <treding@nvidia.com>
> > >> [digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
> > >> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> > >> Acked-by: Peter Chen <peter.chen@nxp.com>
> > > 
> > > This works on my Asus TF300T (Tegra3 device). Minor nit below.
> > > 
> > > Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> (on tf300t)
> > > 
> > 
> > Nice, thank you!
> > 
> > > [...]
> > >> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> > >> new file mode 100644
> > >> index 000000000000..7814500e71fa
> > >> --- /dev/null
> > >> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> > >> @@ -0,0 +1,160 @@
> > > [...]
> > >> +struct tegra_udc_soc_info {
> > >> +	bool supports_unaligned_dma;
> > >> +};
> > > [...]
> > >> +static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
> > >> +	.supports_unaligned_dma = false,
> > >> +};
> > >> +
> > >> +static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
> > >> +	.supports_unaligned_dma = true,
> > >> +};
> > >> +
> > >> +static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
> > >> +	.supports_unaligned_dma = true,
> > >> +};
> > >> +
> > >> +static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
> > >> +	.supports_unaligned_dma = true,
> > >> +};
> > >> +
> > >> +static const struct of_device_id tegra_udc_of_match[] = {
> > >> +	{
> > >> +		.compatible = "nvidia,tegra20-udc",
> > >> +		.data = &tegra20_udc_soc_info,
> > >> +	}, {
> > >> +		.compatible = "nvidia,tegra30-udc",
> > >> +		.data = &tegra30_udc_soc_info,
> > >> +	}, {
> > >> +		.compatible = "nvidia,tegra114-udc",
> > >> +		.data = &tegra114_udc_soc_info,
> > >> +	}, {
> > >> +		.compatible = "nvidia,tegra124-udc",
> > >> +		.data = &tegra124_udc_soc_info,
> > >> +	}, {
> > >> +		/* sentinel */
> > >> +	}
> > >> +};
> > >> +MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
> > > [...]
> > >> +static int tegra_udc_probe(struct platform_device *pdev)
> > >> +{
> > > [...]
> > >> +	/* setup device specific quirks */
> > >> +	soc = id->data;
> > >> +
> > >> +	if (!soc->supports_unaligned_dma)
> > >> +		udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
> > > [...]
> > > 
> > > Some lines would be saved if this was just:
> > > 
> > > udc->data.flags |= id->data;
> > > 

I prefer this way too, and add CI_HDRC_REQUIRES_ALIGNED_DMA as
platform flags for necessary SoCs.

Peter
> > 
> > I think a verbose approach is more preferable and it also more future proof
> > since we may extend soc_info with other stuff later.
> 
> I would just leave that to be done when it's needed. :-)
> 
> Or you could just have udc_flags in struct tegra_udc_soc_info, so
> that it would not need to be translated - again saving code, bugs
> and future developers' time.
> 
> Best Regards,
> Michał Mirosław
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
Dmitry Osipenko July 31, 2017, 10:13 a.m. | #5
On 31.07.2017 04:14, Peter Chen wrote:
> On Fri, Jul 28, 2017 at 05:51:16PM +0200, Michał Mirosław wrote:
>> On Fri, Jul 28, 2017 at 01:00:32PM +0300, Dmitry Osipenko wrote:
>>> On 28.07.2017 01:32, Michał Mirosław wrote:
>>>> On Thu, Jul 27, 2017 at 07:46:07PM +0300, Dmitry Osipenko wrote:
>>>>> From: Thierry Reding <treding@nvidia.com>
>>>>>
>>>>> All of these Tegra SoC generations have a ChipIdea UDC IP block that can
>>>>> be used for device mode communication with a host. Implement rudimentary
>>>>> support that doesn't allow switching between host and device modes.
>>>>>
>>>>> Signed-off-by: Thierry Reding <treding@nvidia.com>
>>>>> [digetx@gmail.com: rebased patches and added DMA alignment quirk for Tegra20]
>>>>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>>>>> Acked-by: Peter Chen <peter.chen@nxp.com>
>>>>
>>>> This works on my Asus TF300T (Tegra3 device). Minor nit below.
>>>>
>>>> Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> (on tf300t)
>>>>
>>>
>>> Nice, thank you!
>>>
>>>> [...]
>>>>> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
>>>>> new file mode 100644
>>>>> index 000000000000..7814500e71fa
>>>>> --- /dev/null
>>>>> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
>>>>> @@ -0,0 +1,160 @@
>>>> [...]
>>>>> +struct tegra_udc_soc_info {
>>>>> +	bool supports_unaligned_dma;
>>>>> +};
>>>> [...]
>>>>> +static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
>>>>> +	.supports_unaligned_dma = false,
>>>>> +};
>>>>> +
>>>>> +static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
>>>>> +	.supports_unaligned_dma = true,
>>>>> +};
>>>>> +
>>>>> +static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
>>>>> +	.supports_unaligned_dma = true,
>>>>> +};
>>>>> +
>>>>> +static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
>>>>> +	.supports_unaligned_dma = true,
>>>>> +};
>>>>> +
>>>>> +static const struct of_device_id tegra_udc_of_match[] = {
>>>>> +	{
>>>>> +		.compatible = "nvidia,tegra20-udc",
>>>>> +		.data = &tegra20_udc_soc_info,
>>>>> +	}, {
>>>>> +		.compatible = "nvidia,tegra30-udc",
>>>>> +		.data = &tegra30_udc_soc_info,
>>>>> +	}, {
>>>>> +		.compatible = "nvidia,tegra114-udc",
>>>>> +		.data = &tegra114_udc_soc_info,
>>>>> +	}, {
>>>>> +		.compatible = "nvidia,tegra124-udc",
>>>>> +		.data = &tegra124_udc_soc_info,
>>>>> +	}, {
>>>>> +		/* sentinel */
>>>>> +	}
>>>>> +};
>>>>> +MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
>>>> [...]
>>>>> +static int tegra_udc_probe(struct platform_device *pdev)
>>>>> +{
>>>> [...]
>>>>> +	/* setup device specific quirks */
>>>>> +	soc = id->data;
>>>>> +
>>>>> +	if (!soc->supports_unaligned_dma)
>>>>> +		udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
>>>> [...]
>>>>
>>>> Some lines would be saved if this was just:
>>>>
>>>> udc->data.flags |= id->data;
>>>>
> 
> I prefer this way too, and add CI_HDRC_REQUIRES_ALIGNED_DMA as
> platform flags for necessary SoCs.
> 

Okay, please let me know if there are any other nitpicks.

Patch

diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 39fca5715ed3..ddcbddf8361a 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -15,3 +15,4 @@  obj-$(CONFIG_USB_CHIPIDEA)	+= ci_hdrc_zevio.o
 obj-$(CONFIG_USB_CHIPIDEA_PCI)	+= ci_hdrc_pci.o
 
 obj-$(CONFIG_USB_CHIPIDEA_OF)	+= usbmisc_imx.o ci_hdrc_imx.o
+obj-$(CONFIG_USB_CHIPIDEA_OF)	+= ci_hdrc_tegra.o
diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
new file mode 100644
index 000000000000..7814500e71fa
--- /dev/null
+++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
@@ -0,0 +1,160 @@ 
+/*
+ * Copyright (c) 2016, NVIDIA Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+
+#include <linux/usb/chipidea.h>
+
+#include "ci.h"
+
+struct tegra_udc_soc_info {
+	bool supports_unaligned_dma;
+};
+
+struct tegra_udc {
+	struct ci_hdrc_platform_data data;
+	struct platform_device *dev;
+
+	struct usb_phy *phy;
+	struct clk *clk;
+};
+
+static const struct tegra_udc_soc_info tegra20_udc_soc_info = {
+	.supports_unaligned_dma = false,
+};
+
+static const struct tegra_udc_soc_info tegra30_udc_soc_info = {
+	.supports_unaligned_dma = true,
+};
+
+static const struct tegra_udc_soc_info tegra114_udc_soc_info = {
+	.supports_unaligned_dma = true,
+};
+
+static const struct tegra_udc_soc_info tegra124_udc_soc_info = {
+	.supports_unaligned_dma = true,
+};
+
+static const struct of_device_id tegra_udc_of_match[] = {
+	{
+		.compatible = "nvidia,tegra20-udc",
+		.data = &tegra20_udc_soc_info,
+	}, {
+		.compatible = "nvidia,tegra30-udc",
+		.data = &tegra30_udc_soc_info,
+	}, {
+		.compatible = "nvidia,tegra114-udc",
+		.data = &tegra114_udc_soc_info,
+	}, {
+		.compatible = "nvidia,tegra124-udc",
+		.data = &tegra124_udc_soc_info,
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
+
+static int tegra_udc_probe(struct platform_device *pdev)
+{
+	const struct tegra_udc_soc_info *soc;
+	const struct of_device_id *id;
+	struct tegra_udc *udc;
+	int err;
+
+	udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
+	if (!udc)
+		return -ENOMEM;
+
+	id = of_match_node(tegra_udc_of_match, pdev->dev.of_node);
+	if (!id)
+		return -ENODEV;
+
+	udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
+	if (IS_ERR(udc->phy)) {
+		err = PTR_ERR(udc->phy);
+		dev_err(&pdev->dev, "failed to get PHY: %d\n", err);
+		return err;
+	}
+
+	udc->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(udc->clk)) {
+		err = PTR_ERR(udc->clk);
+		dev_err(&pdev->dev, "failed to get clock: %d\n", err);
+		return err;
+	}
+
+	err = clk_prepare_enable(udc->clk);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
+		return err;
+	}
+
+	/* setup and register ChipIdea HDRC device */
+	udc->data.name = "tegra-udc";
+	udc->data.capoffset = DEF_CAPOFFSET;
+	udc->data.flags = 0;
+	udc->data.usb_phy = udc->phy;
+
+	/* setup device specific quirks */
+	soc = id->data;
+
+	if (!soc->supports_unaligned_dma)
+		udc->data.flags |= CI_HDRC_REQUIRES_ALIGNED_DMA;
+
+	/*
+	 * Tegra's USB PHY driver doesn't implement optional phy_init()
+	 * hook, so we have to power on UDC controller before ChipIdea
+	 * driver initialization kicks in.
+	 */
+	usb_phy_set_suspend(udc->phy, 0);
+
+	udc->dev = ci_hdrc_add_device(&pdev->dev, pdev->resource,
+				      pdev->num_resources, &udc->data);
+	if (IS_ERR(udc->dev)) {
+		err = PTR_ERR(udc->dev);
+		dev_err(&pdev->dev, "failed to add HDRC device: %d\n", err);
+		goto power_off;
+	}
+
+	platform_set_drvdata(pdev, udc);
+
+	return 0;
+
+power_off:
+	usb_phy_set_suspend(udc->phy, 1);
+	clk_disable_unprepare(udc->clk);
+	return err;
+}
+
+static int tegra_udc_remove(struct platform_device *pdev)
+{
+	struct tegra_udc *udc = platform_get_drvdata(pdev);
+
+	usb_phy_set_suspend(udc->phy, 1);
+	clk_disable_unprepare(udc->clk);
+
+	return 0;
+}
+
+static struct platform_driver tegra_udc_driver = {
+	.driver = {
+		.name = "tegra-udc",
+		.of_match_table = tegra_udc_of_match,
+	},
+	.probe = tegra_udc_probe,
+	.remove = tegra_udc_remove,
+};
+module_platform_driver(tegra_udc_driver);
+
+MODULE_DESCRIPTION("NVIDIA Tegra USB device mode driver");
+MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
+MODULE_ALIAS("platform:tegra-udc");
+MODULE_LICENSE("GPL v2");