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Date: Thu, 24 Sep 2015 17:06:31 +0800
From: Peter Chen <peter.chen@...escale.com>
To: Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@...inx.com>
CC: <balbi@...com>, <devicetree@...r.kernel.org>, <kishon@...com>,
<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <punnaia@...inx.com>,
"Subbaraya Sundeep Bhatta" <sbhatta@...inx.com>
Subject: Re: [RFC PATCH 2/2] usb: phy: Add platform driver support for ULPI
PHYs
On Wed, Sep 23, 2015 at 06:24:33PM +0530, Subbaraya Sundeep Bhatta wrote:
> Based on board design USB controller needs explicit software
> access to ULPI PHY for controlling VBUS. This patch adds platform
> driver support for generic ULPI PHYs and provides a USB2 PHY device
> to controllers.
>
> Signed-off-by: Subbaraya Sundeep Bhatta <sbhatta@...inx.com>
> ---
> drivers/usb/phy/Kconfig | 12 +++
> drivers/usb/phy/Makefile | 1 +
> drivers/usb/phy/phy-platform-ulpi.c | 143 +++++++++++++++++++++++++++++++++++
> 3 files changed, 156 insertions(+), 0 deletions(-)
> create mode 100644 drivers/usb/phy/phy-platform-ulpi.c
>
> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> index 7d3beee..2956ad4 100644
> --- a/drivers/usb/phy/Kconfig
> +++ b/drivers/usb/phy/Kconfig
> @@ -201,6 +201,18 @@ config USB_RCAR_PHY
> To compile this driver as a module, choose M here: the
> module will be called phy-rcar-usb.
>
> +config USB_PLATFORM_ULPI_PHY
> + tristate "Platform driver support for ULPI PHYs"
> + depends on ARCH_ZYNQ || COMPILE_TEST
If you want this as a common driver, drop platform dependency please.
> + select USB_PHY
> + select USB_ULPI_VIEWPORT
> + help
> + Say Y here to add support for the Platform driver for ULPI PHYs.
> + This adds platform driver support for all generic ULPI PHYs and is
> + typically used if usb controller driver needs explicit access to PHY.
> +
> + To compile this driver as a module, choose M here.
> +
> config USB_ULPI
> bool "Generic ULPI Transceiver Driver"
> depends on ARM || ARM64
> diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
> index 19c0dcc..8431b6b 100644
> --- a/drivers/usb/phy/Makefile
> +++ b/drivers/usb/phy/Makefile
> @@ -24,6 +24,7 @@ obj-$(CONFIG_USB_QCOM_8X16_PHY) += phy-qcom-8x16-usb.o
> obj-$(CONFIG_USB_MV_OTG) += phy-mv-usb.o
> obj-$(CONFIG_USB_MXS_PHY) += phy-mxs-usb.o
> obj-$(CONFIG_USB_RCAR_PHY) += phy-rcar-usb.o
> +obj-$(CONFIG_USB_PLATFORM_ULPI_PHY) += phy-platform-ulpi.o
> obj-$(CONFIG_USB_ULPI) += phy-ulpi.o
> obj-$(CONFIG_USB_ULPI_VIEWPORT) += phy-ulpi-viewport.o
> obj-$(CONFIG_KEYSTONE_USB_PHY) += phy-keystone.o
> diff --git a/drivers/usb/phy/phy-platform-ulpi.c b/drivers/usb/phy/phy-platform-ulpi.c
> new file mode 100644
> index 0000000..fb89363
> --- /dev/null
> +++ b/drivers/usb/phy/phy-platform-ulpi.c
> @@ -0,0 +1,143 @@
> +/*
> + * Platform driver for generic ULPI PHYs.
> + *
> + * Copyright (C) 2015 Xilinx, Inc.
> + *
> + * Author: Subbaraya Sundeep <sbhatta@...inx.com>
> + *
> + * This program is free software; you can redistribute it
> + * and/or modify it under the terms of the GNU General Public
> + * License as published by the Free Software Foundation;
> + * either version 2 of the License, or (at your option) any
> + * later version.
> + */
> +
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/usb/ulpi.h>
> +#include <linux/usb/phy.h>
> +
> +/**
> + * struct ulpi_phy - The ULPI PHY
> + * @usb_phy: pointer to usb phy
> + * @regs: base address of USB controller to which PHY is connected
> + * @vp_offset: ulpi viewport register offset of USB controller
> + * @flags: initial required settings of PHY
> + */
> +
> +struct ulpi_phy {
> + struct usb_phy *usb_phy;
> + void __iomem *regs;
> + unsigned int vp_offset;
> + unsigned int flags;
> +};
> +
> +/**
> + * usbphy_set_vbus - Sets VBUS by writing to PHY.
> + * @phy: pointer to PHY
> + * @on: 1 - turn on VBUS
> + * 0 - turn off VBUS
> + * Return: 0 for success and error value on failure
> + */
> +static int usbphy_set_vbus(struct usb_phy *phy, int on)
> +{
> + unsigned int flags = usb_phy_io_read(phy, ULPI_OTG_CTRL);
> +
> + flags &= ~(ULPI_OTG_CTRL_DRVVBUS | ULPI_OTG_CTRL_DRVVBUS_EXT);
> +
> + if (on) {
> + if (phy->flags & ULPI_OTG_DRVVBUS)
> + flags |= ULPI_OTG_CTRL_DRVVBUS;
> +
> + if (phy->flags & ULPI_OTG_DRVVBUS_EXT)
> + flags |= ULPI_OTG_CTRL_DRVVBUS_EXT;
> + }
> +
> + return usb_phy_io_write(phy, flags, ULPI_OTG_CTRL);
> +}
> +
> +/**
> + * ulpi_phy_probe - The device probe function for driver initialization.
> + * @pdev: pointer to the platform device structure.
> + *
> + * Return: 0 for success and error value on failure
> + */
> +static int ulpi_phy_probe(struct platform_device *pdev)
> +{
> + struct device_node *np = pdev->dev.of_node;
> + struct resource *res;
> + struct ulpi_phy *uphy;
> + bool flag;
> + int ret;
> +
> + uphy = devm_kzalloc(&pdev->dev, sizeof(*uphy), GFP_KERNEL);
> + if (!uphy)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + uphy->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
> + if (IS_ERR(uphy->regs))
> + return PTR_ERR(uphy->regs);
> +
> + ret = of_property_read_u32(np, "view-port", &uphy->vp_offset);
> + if (IS_ERR(uphy->regs)) {
> + dev_err(&pdev->dev, "view-port register not specified\n");
> + return PTR_ERR(uphy->regs);
> + }
> +
> + flag = of_property_read_bool(np, "drv-vbus");
> + if (flag)
> + uphy->flags |= ULPI_OTG_DRVVBUS | ULPI_OTG_DRVVBUS_EXT;
> +
> + uphy->usb_phy = otg_ulpi_create(&ulpi_viewport_access_ops, uphy->flags);
> +
> + uphy->usb_phy->set_vbus = usbphy_set_vbus;
When you will call it?
> +
> + uphy->usb_phy->dev = &pdev->dev;
> +
> + uphy->usb_phy->io_priv = uphy->regs + uphy->vp_offset;
> +
> + ret = usb_add_phy_dev(uphy->usb_phy);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +/**
> + * ulpi_phy_remove - Releases the resources allocated during the initialization.
> + * @pdev: pointer to the platform device structure.
> + *
> + * Return: 0 always
> + */
> +static int ulpi_phy_remove(struct platform_device *pdev)
> +{
> + struct ulpi_phy *uphy = platform_get_drvdata(pdev);
You have not set uphy as device drvdata at probe
> +
> + usb_remove_phy(uphy->usb_phy);
> +
> + return 0;
> +}
> +
> +/* Match table for of_platform binding */
> +static const struct of_device_id ulpi_phy_table[] = {
> + { .compatible = "ulpi-phy" },
> + { /* end of list */},
> +};
> +MODULE_DEVICE_TABLE(of, ulpi_phy_table);
> +
> +static struct platform_driver ulpi_phy_driver = {
> + .probe = ulpi_phy_probe,
> + .remove = ulpi_phy_remove,
> + .driver = {
> + .name = "ulpi-platform-phy",
> + .of_match_table = of_match_ptr(ulpi_phy_table),
> + },
> +};
> +module_platform_driver(ulpi_phy_driver);
> +
> +MODULE_DESCRIPTION("ULPI PHY platform driver");
> +MODULE_AUTHOR("Xilinx, Inc");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.1
>
--
Best Regards,
Peter Chen
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