On Tue, Jun 24, 2014 at 12:35:16PM +0200, Antoine Ténart wrote:
> Add a generic ChipIdea driver, with optional PHY and clock, to support
> ChipIdea controllers that doesn't need specific functions.
>
> Needed for the Marvell Berlin SoCs SUB controllers.
>
> Signed-off-by: Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/usb/chipidea/Makefile | 1 +
> drivers/usb/chipidea/ci_hdrc_generic.c | 108 +++++++++++++++++++++++++++++++++
> 2 files changed, 109 insertions(+)
> create mode 100644 drivers/usb/chipidea/ci_hdrc_generic.c
>
> diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
> index 2f099c7df7b5..c705f0fe7a00 100644
> --- a/drivers/usb/chipidea/Makefile
> +++ b/drivers/usb/chipidea/Makefile
> @@ -20,4 +20,5 @@ endif
>
> ifneq ($(CONFIG_OF),)
> obj-$(CONFIG_USB_CHIPIDEA) += usbmisc_imx.o ci_hdrc_imx.o
> + obj-$(CONFIG_USB_CHIPIDEA) += ci_hdrc_generic.o
> endif
As a generic driver, you may need to support both dt and non-dt
solution.
> diff --git a/drivers/usb/chipidea/ci_hdrc_generic.c b/drivers/usb/chipidea/ci_hdrc_generic.c
> new file mode 100644
> index 000000000000..27520710a1f7
> --- /dev/null
> +++ b/drivers/usb/chipidea/ci_hdrc_generic.c
> @@ -0,0 +1,108 @@
> +/*
> + * Copyright (C) 2014 Marvell Technology Group Ltd.
> + *
> + * Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/usb/chipidea.h>
> +#include <linux/usb/hcd.h>
> +#include <linux/usb/ulpi.h>
> +
> +#include "ci.h"
> +
> +struct ci_hdrc_generic_priv {
> + struct platform_device *ci_pdev;
> + struct clk *clk;
> +};
> +
> +static int ci_hdrc_generic_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct ci_hdrc_generic_priv *priv;
> + struct ci_hdrc_platform_data ci_pdata = {
> + .name = "ci_hdrc",
How about this using dev_name(&pdev->dev) for name?
> + .capoffset = DEF_CAPOFFSET,
> + .flags = CI_HDRC_REQUIRE_TRANSCEIVER |
> + CI_HDRC_DISABLE_STREAMING,
> + };
> + int ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->clk = devm_clk_get(dev, NULL);
> + if (!IS_ERR(priv->clk)) {
> + ret = clk_prepare_enable(priv->clk);
> + if (ret) {
> + dev_err(dev, "failed to enable the clock: %d\n", ret);
> + return ret;
> + }
> + }
> +
> + ci_pdata.phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
> + if (IS_ERR(ci_pdata.phy))
> + /* PHY is optional */
> + ci_pdata.phy = NULL;
> +
> + priv->ci_pdev = ci_hdrc_add_device(dev, pdev->resource,
> + pdev->num_resources, &ci_pdata);
> + if (IS_ERR(priv->ci_pdev)) {
> + ret = PTR_ERR(priv->ci_pdev);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev,
> + "failed to register ci_hdrc platform device: %d\n",
> + ret);
> + goto clk_err;
> + }
> +
> + platform_set_drvdata(pdev, priv);
> +
> + pm_runtime_no_callbacks(dev);
> + pm_runtime_enable(dev);
> +
> + return 0;
> +
> +clk_err:
> + clk_disable_unprepare(priv->clk);
You may need to add "if (!IS_ERR(priv->clk))"
> + return ret;
> +}
> +
> +static int ci_hdrc_generic_remove(struct platform_device *pdev)
> +{
> + struct ci_hdrc_generic_priv *priv = platform_get_drvdata(pdev);
> +
> + pm_runtime_disable(&pdev->dev);
> + ci_hdrc_remove_device(priv->ci_pdev);
> + clk_disable_unprepare(priv->clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id ci_hdrc_generic_of_match[] = {
> + { .compatible = "chipidea-usb" },
> + { }
> +};
Even as a generic driver, you can also use your own compatible string.
> +MODULE_DEVICE_TABLE(of, ci_hdrc_generic_of_match);
> +
> +static struct platform_driver ci_hdrc_generic_driver = {
> + .probe = ci_hdrc_generic_probe,
> + .remove = ci_hdrc_generic_remove,
> + .driver = {
> + .name = "chipidea-usb",
> + .owner = THIS_MODULE,
> + .of_match_table = ci_hdrc_generic_of_match,
> + },
> +};
> +module_platform_driver(ci_hdrc_generic_driver);
> +
> +MODULE_DESCRIPTION("Generic ChipIdea HDRC USB binding");
> +MODULE_AUTHOR("Antoine Ténart <antoine.tenart@xxxxxxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
--
Best Regards,
Peter Chen
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