Re: [Patch v7 1/3] usb: dwc3: Add Qualcomm DWC3 glue layer driver

[Jingoo Han]

On Tuesday, July 01, 2014 1:04 AM, Felipe Balbi wrote:
> 
> From: "Ivan T. Ivanov" <iivanov@xxxxxxxxxx>
> 
> DWC3 glue layer is hardware layer around Synopsys DesignWare
> USB3 core. Its purpose is to supply Synopsys IP with required
> clocks, voltages and interface it with the rest of the SoC.
> 
> Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
> Signed-off-by: Andy Gross <agross@xxxxxxxxxxxxxx>
> ---
>  drivers/usb/dwc3/Kconfig     |    9 +++
>  drivers/usb/dwc3/Makefile    |    1 +
>  drivers/usb/dwc3/dwc3-qcom.c |  153 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 163 insertions(+)
>  create mode 100644 drivers/usb/dwc3/dwc3-qcom.c
> 
> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> index 8eb996e..29fcbfd 100644
> --- a/drivers/usb/dwc3/Kconfig
> +++ b/drivers/usb/dwc3/Kconfig
> @@ -79,6 +79,15 @@ config USB_DWC3_KEYSTONE
>  	  Support of USB2/3 functionality in TI Keystone2 platforms.
>  	  Say 'Y' or 'M' here if you have one such device
> 
> +config USB_DWC3_QCOM
> +       tristate "Qualcomm Platforms"
> +       default USB_DWC3

How about adding the machine dependency? Ex. ARCH_QCOM?
Currently, other dwc3 glue layers are using ARCH_* dependency.


> +       select USB_QCOM_DWC3_PHY
> +       help
> +         Recent Qualcomm SoCs ship with one DesignWare Core USB3 IP inside,
> +         say 'Y' or 'M' if you have one such device.
> +
> +

Please remove an unnecessary line. One line is enough.

>  comment "Debugging features"
> 
>  config USB_DWC3_DEBUG
> diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
> index 10ac3e7..0da8e75 100644
> --- a/drivers/usb/dwc3/Makefile
> +++ b/drivers/usb/dwc3/Makefile
> @@ -33,3 +33,4 @@ obj-$(CONFIG_USB_DWC3_OMAP)		+= dwc3-omap.o
>  obj-$(CONFIG_USB_DWC3_EXYNOS)		+= dwc3-exynos.o
>  obj-$(CONFIG_USB_DWC3_PCI)		+= dwc3-pci.o
>  obj-$(CONFIG_USB_DWC3_KEYSTONE)		+= dwc3-keystone.o
> +obj-$(CONFIG_USB_DWC3_QCOM)		+= dwc3-qcom.o
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> new file mode 100644
> index 0000000..e99764a
> --- /dev/null
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -0,0 +1,153 @@
> +/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/usb/phy.h>
> +
> +#include "core.h"
> +
> +

Please remove an unnecessary line. One line is enough.

> +struct dwc3_qcom {
> +	struct device		*dev;
> +
> +	struct clk		*core_clk;
> +	struct clk		*iface_clk;
> +	struct clk		*sleep_clk;
> +
> +	struct regulator	*gdsc;
> +};
> +
> +static int dwc3_qcom_probe(struct platform_device *pdev)
> +{
> +	struct device_node *node = pdev->dev.of_node;
> +	struct dwc3_qcom *qdwc;
> +	int ret = 0;
> +
> +	qdwc = devm_kzalloc(&pdev->dev, sizeof(*qdwc), GFP_KERNEL);
> +	if (!qdwc)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, qdwc);
> +
> +	qdwc->dev = &pdev->dev;
> +
> +	qdwc->gdsc = devm_regulator_get(qdwc->dev, "gdsc");
> +
> +	qdwc->core_clk = devm_clk_get(qdwc->dev, "core");
> +	if (IS_ERR(qdwc->core_clk)) {
> +		dev_dbg(qdwc->dev, "failed to get core clock\n");
> +		return PTR_ERR(qdwc->core_clk);
> +	}
> +
> +	qdwc->iface_clk = devm_clk_get(qdwc->dev, "iface");
> +	if (IS_ERR(qdwc->iface_clk)) {
> +		dev_dbg(qdwc->dev, "failed to get iface clock, skipping\n");
> +		qdwc->iface_clk = NULL;
> +	}
> +
> +	qdwc->sleep_clk = devm_clk_get(qdwc->dev, "sleep");
> +	if (IS_ERR(qdwc->sleep_clk)) {
> +		dev_dbg(qdwc->dev, "failed to get sleep clock, skipping\n");
> +		qdwc->sleep_clk = NULL;
> +	}
> +
> +	if (!IS_ERR(qdwc->gdsc)) {
> +		ret = regulator_enable(qdwc->gdsc);
> +		if (ret)
> +			dev_err(qdwc->dev, "cannot enable gdsc\n");
> +	}
> +
> +	clk_prepare_enable(qdwc->core_clk);
> +
> +	if (qdwc->iface_clk)
> +		clk_prepare_enable(qdwc->iface_clk);
> +
> +	if (qdwc->sleep_clk)
> +		clk_prepare_enable(qdwc->sleep_clk);
> +
> +	ret = of_platform_populate(node, NULL, NULL, qdwc->dev);
> +	if (ret) {
> +		dev_err(qdwc->dev, "failed to register core - %d\n", ret);
> +		dev_dbg(qdwc->dev, "failed to add create dwc3 core\n");

Is there any reason to use two similar messages?
For me, it looks duplicated.

> +		goto dis_clks;
> +	}
> +
> +	return 0;
> +
> +dis_clks:
> +	if (qdwc->sleep_clk)
> +		clk_disable_unprepare(qdwc->sleep_clk);
> +
> +	if (qdwc->iface_clk)
> +		clk_disable_unprepare(qdwc->iface_clk);
> +
> +	clk_disable_unprepare(qdwc->core_clk);
> +
> +	if (!IS_ERR(qdwc->gdsc)) {
> +		ret = regulator_disable(qdwc->gdsc);
> +		if (ret)
> +			dev_dbg(qdwc->dev, "cannot disable gdsc\n");
> +	}
> +
> +	return ret;
> +}
> +
> +static int dwc3_qcom_remove(struct platform_device *pdev)
> +{
> +	int ret = 0;
> +
> +	struct dwc3_qcom *qdwc = platform_get_drvdata(pdev);
> +
> +	if (qdwc->sleep_clk)
> +		clk_disable_unprepare(qdwc->sleep_clk);
> +
> +	if (qdwc->iface_clk)
> +		clk_disable_unprepare(qdwc->iface_clk);
> +
> +	clk_disable_unprepare(qdwc->core_clk);
> +
> +	if (!IS_ERR(qdwc->gdsc)) {
> +		ret = regulator_disable(qdwc->gdsc);
> +		if (ret)
> +			dev_dbg(qdwc->dev, "cannot disable gdsc\n");
> +	}
> +	return ret;
> +}
> +
> +static const struct of_device_id of_dwc3_match[] = {
> +	{ .compatible = "qcom,dwc3" },
> +	{ /* Sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, of_dwc3_match);
> +
> +static struct platform_driver dwc3_qcom_driver = {
> +	.probe		= dwc3_qcom_probe,
> +	.remove		= dwc3_qcom_remove,
> +	.driver		= {
> +		.name	= "qcom-dwc3",
> +		.owner	= THIS_MODULE,
> +		.of_match_table	= of_dwc3_match,
> +	},
> +};
> +
> +module_platform_driver(dwc3_qcom_driver);
> +
> +MODULE_ALIAS("platform:qcom-dwc3");

How about adding the module author as Ivan T. Ivanov and you?

MODULE_AUTHOR("Ivan T. Ivanov <iivanov@xxxxxxxxxx>");
MODULE_AUTHOR("Andy Gross <agross@xxxxxxxxxxxxxx>");

Best regards,
Jingoo Han

> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("DesignWare USB3 QCOM Glue Layer");
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation

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