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    Subject[RFC 1/5] usb: chipidea: Add support for Tegra20/30/114/124
    Date
    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>
    ---
    drivers/usb/chipidea/Makefile | 1 +
    drivers/usb/chipidea/ci_hdrc_tegra.c | 109 +++++++++++++++++++++++++++++++++++
    2 files changed, 110 insertions(+)
    create mode 100644 drivers/usb/chipidea/ci_hdrc_tegra.c

    diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
    index 518e445476c3..3532df6561d9 100644
    --- a/drivers/usb/chipidea/Makefile
    +++ b/drivers/usb/chipidea/Makefile
    @@ -10,6 +10,7 @@ ci_hdrc-$(CONFIG_USB_OTG_FSM) += otg_fsm.o
    obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc_usb2.o
    obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc_msm.o
    obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc_zevio.o
    +obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc_tegra.o

    obj-$(CONFIG_USB_CHIPIDEA_PCI) += ci_hdrc_pci.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..d3cd68441856
    --- /dev/null
    +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
    @@ -0,0 +1,109 @@
    +/*
    + * 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 {
    + struct ci_hdrc_platform_data data;
    + struct platform_device *dev;
    +
    + struct usb_phy *phy;
    + struct clk *clk;
    +};
    +
    +static const struct of_device_id tegra_udc_of_match[] = {
    + { .compatible = "nvidia,tegra20-udc" },
    + { .compatible = "nvidia,tegra30-udc" },
    + { .compatible = "nvidia,tegra114-udc" },
    + { .compatible = "nvidia,tegra124-udc" },
    + { /* sentinel */ }
    +};
    +MODULE_DEVICE_TABLE(of, tegra_udc_of_match);
    +
    +static int tegra_udc_probe(struct platform_device *pdev)
    +{
    + struct tegra_udc *udc;
    + int err;
    +
    + udc = devm_kzalloc(&pdev->dev, sizeof(*udc), GFP_KERNEL);
    + if (!udc)
    + return -ENOMEM;
    +
    + 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;
    +
    + 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 disable_clock;
    + }
    +
    + platform_set_drvdata(pdev, udc);
    +
    + return 0;
    +
    +disable_clock:
    + clk_disable_unprepare(udc->clk);
    + return err;
    +}
    +
    +static int tegra_udc_remove(struct platform_device *pdev)
    +{
    + struct tegra_udc *udc = platform_get_drvdata(pdev);
    +
    + 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");
    --
    2.8.3
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