Re: [PATCH 3/6] phy: Add driver to support individual USB PHYs on sun9i

Maxime Ripard
2014-11-04T17:05:07Z

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On Tue, Nov 04, 2014 at 12:07:16PM +0800, Chen-Yu Tsai wrote:
> Unlike previous Allwinner SoCs, there is no central PHY control block
> on the A80. Also, OTG support is completely split off into a different
> controller.
>
> This adds a new driver to support the regular USB PHYs.
>
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> ---
> .../devicetree/bindings/phy/sun9i-usb-phy.txt | 34 +++
> drivers/phy/Kconfig | 12 ++
> drivers/phy/Makefile | 1 +
> drivers/phy/phy-sun9i-usb.c | 227 +++++++++++++++++++++
> 4 files changed, 274 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt
> create mode 100644 drivers/phy/phy-sun9i-usb.c
>
> diff --git a/Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt
> new file mode 100644
> index 0000000..27a6067
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/sun9i-usb-phy.txt
> @@ -0,0 +1,34 @@
> +Allwinner sun9i USB PHY
> +-----------------------
> +
> +Required properties:
> +- compatible : should be one of
> + * allwinner,sun9i-a80-usb-phy
> +- reg : a list of offset + length pairs
> +- #phy-cells : from the generic phy bindings, must be 0
> +- clocks : phandle + clock specifier for the phy clocks
> +- clock-names :
> + * "phy" for normal USB
> + * "hsic_480M", "hsic_12M" for HSIC

Do you need all of them? phy and one of the hsic one?

> +- resets : a list of phandle + reset specifier pairs
> +- reset-names :
> + * "phy" for normal USB
> + * "hsic" for HSIC
> +- phy_type : "hsic" for HSIC usage;
> + other values or absence of this property indicates normal USB
> +
> +It is recommended to list all clocks and resets available.
> +The driver will only use those matching the phy_type.
> +
> +Example:
> + usbphy1: phy@00a01800 {
> + compatible = "allwinner,sun9i-a80-usb-phy";
> + reg = <0x00a01800 0x4>;
> + clocks = <&usb_phy_clk 2>, <&usb_phy_clk 10>,
> + <&usb_phy_clk 3>;
> + clock-names = "hsic_480M", "hsic_12M", "phy";
> + resets = <&usb_phy_clk 18>, <&usb_phy_clk 19>;
> + reset-names = "hsic", "phy";
> + status = "disabled";
> + #phy-cells = <0>;
> + };
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 2a436e6..f5b7fbb 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -153,6 +153,18 @@ config PHY_SUN4I_USB
> This driver controls the entire USB PHY block, both the USB OTG
> parts, as well as the 2 regular USB 2 host PHYs.
>
> +config PHY_SUN9I_USB
> + tristate "Allwinner sun9i SoC USB PHY driver"
> + depends on ARCH_SUNXI && HAS_IOMEM && OF
> + depends on RESET_CONTROLLER
> + select USB_PHY
> + select GENERIC_PHY
> + help
> + Enable this to support the transceiver that is part of Allwinner
> + sun9i SoCs.
> +
> + This driver controls each individual USB 2 host PHY.
> +
> config PHY_SAMSUNG_USB2
> tristate "Samsung USB 2.0 PHY driver"
> depends on HAS_IOMEM
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index c4590fc..c3977dc 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_TWL4030_USB) += phy-twl4030-usb.o
> obj-$(CONFIG_PHY_EXYNOS5250_SATA) += phy-exynos5250-sata.o
> obj-$(CONFIG_PHY_HIX5HD2_SATA) += phy-hix5hd2-sata.o
> obj-$(CONFIG_PHY_SUN4I_USB) += phy-sun4i-usb.o
> +obj-$(CONFIG_PHY_SUN9I_USB) += phy-sun9i-usb.o
> obj-$(CONFIG_PHY_SAMSUNG_USB2) += phy-exynos-usb2.o
> phy-exynos-usb2-y += phy-samsung-usb2.o
> phy-exynos-usb2-$(CONFIG_PHY_EXYNOS4210_USB2) += phy-exynos4210-usb2.o
> diff --git a/drivers/phy/phy-sun9i-usb.c b/drivers/phy/phy-sun9i-usb.c
> new file mode 100644
> index 0000000..f9085d9
> --- /dev/null
> +++ b/drivers/phy/phy-sun9i-usb.c
> @@ -0,0 +1,227 @@
> +/*
> + * Allwinner sun9i USB phy driver
> + *
> + * Copyright (C) 2014 Chen-Yu Tsai <wens@csie.org>
> + *
> + * Based on phy-sun9i.c from

I doubt this is the file you were thinking of :)

> + * Hans de Goede <hdegoede@redhat.com>
> + *
> + * and code from
> + * Allwinner Technology Co., Ltd. <www.allwinnertech.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.
> + *
> + * 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/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/usb/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +
> +#define SUNXI_AHB_ICHR8_EN BIT(10)
> +#define SUNXI_AHB_INCR4_BURST_EN BIT(9)
> +#define SUNXI_AHB_INCRX_ALIGN_EN BIT(8)
> +#define SUNXI_ULPI_BYPASS_EN BIT(0)
> +
> +struct sun9i_usb_phy {
> + struct phy *phy;
> + void __iomem *pmu;
> + struct regulator *vbus;
> + struct reset_control *reset;
> + struct clk *clk;
> + struct clk *hsic_clk;
> +};
> +
> +static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)
> +{
> + u32 bits, reg_value;
> +
> + bits = SUNXI_AHB_ICHR8_EN | SUNXI_AHB_INCR4_BURST_EN |
> + SUNXI_AHB_INCRX_ALIGN_EN | SUNXI_ULPI_BYPASS_EN;
> +
> + reg_value = readl(phy->pmu);
> +
> + if (enable)
> + reg_value |= bits;
> + else
> + reg_value &= ~bits;
> +
> + writel(reg_value, phy->pmu);
> +}
> +
> +static int sun9i_usb_phy_init(struct phy *_phy)
> +{
> + struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
> + int ret;
> +
> + ret = clk_prepare_enable(phy->clk);
> + if (ret)
> + return ret;
> +
> + if (phy->hsic_clk) {
> + ret = clk_prepare_enable(phy->hsic_clk);
> + if (ret) {
> + clk_disable_unprepare(phy->clk);
> + return ret;
> + }
> + }
> +
> + ret = reset_control_deassert(phy->reset);
> + if (ret) {
> + if (phy->hsic_clk)
> + clk_disable_unprepare(phy->hsic_clk);
> + clk_disable_unprepare(phy->clk);
> + return ret;

Gotos in your exit path please.

> + }
> +
> + sun9i_usb_phy_passby(phy, 1);
> +
> + return 0;
> +}
> +
> +static int sun9i_usb_phy_exit(struct phy *_phy)
> +{
> + struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
> +
> + sun9i_usb_phy_passby(phy, 0);
> + reset_control_assert(phy->reset);
> + if (phy->hsic_clk)
> + clk_disable_unprepare(phy->hsic_clk);
> + clk_disable_unprepare(phy->clk);
> +
> + return 0;
> +}
> +
> +static int sun9i_usb_phy_power_on(struct phy *_phy)
> +{
> + struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
> + int ret = 0;
> +
> + if (phy->vbus)
> + ret = regulator_enable(phy->vbus);
> +
> + return ret;
> +}
> +
> +static int sun9i_usb_phy_power_off(struct phy *_phy)
> +{
> + struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
> +
> + if (phy->vbus)
> + regulator_disable(phy->vbus);
> +
> + return 0;
> +}
> +
> +static struct phy_ops sun9i_usb_phy_ops = {
> + .init = sun9i_usb_phy_init,
> + .exit = sun9i_usb_phy_exit,
> + .power_on = sun9i_usb_phy_power_on,
> + .power_off = sun9i_usb_phy_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static int sun9i_usb_phy_probe(struct platform_device *pdev)
> +{
> + struct sun9i_usb_phy *phy;
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev->of_node;
> + struct phy_provider *phy_provider;
> + struct resource *res;
> + enum usb_phy_interface phy_type;
> +
> + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> + if (!phy)
> + return -ENOMEM;
> +
> + phy->vbus = devm_regulator_get_optional(dev, "vbus");
> + if (IS_ERR(phy->vbus)) {
> + if (PTR_ERR(phy->vbus) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + phy->vbus = NULL;
> + }
> +
> + phy_type = of_usb_get_phy_mode(np);
> + if (phy_type == USBPHY_INTERFACE_MODE_HSIC) {
> + phy->clk = devm_clk_get(dev, "hsic_480M");
> + if (IS_ERR(phy->clk)) {
> + dev_err(dev, "failed to get hsic_480M clock\n");
> + return PTR_ERR(phy->clk);
> + }
> +
> + phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
> + if (IS_ERR(phy->clk)) {
> + dev_err(dev, "failed to get hsic_12M clock\n");
> + return PTR_ERR(phy->clk);
> + }
> +
> + phy->reset = devm_reset_control_get(dev, "hsic");
> + if (IS_ERR(phy->reset)) {
> + dev_err(dev, "failed to get reset control\n");
> + return PTR_ERR(phy->reset);
> + }
> + } else {
> + phy->clk = devm_clk_get(dev, "phy");
> + if (IS_ERR(phy->clk)) {
> + dev_err(dev, "failed to get phy clock\n");
> + return PTR_ERR(phy->clk);
> + }
> +
> + phy->reset = devm_reset_control_get(dev, "phy");
> + if (IS_ERR(phy->reset)) {
> + dev_err(dev, "failed to get reset control\n");
> + return PTR_ERR(phy->reset);
> + }
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + phy->pmu = devm_ioremap_resource(dev, res);
> + if (IS_ERR(phy->pmu))
> + return PTR_ERR(phy->pmu);
> +
> + phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops, NULL);
> + if (IS_ERR(phy->phy)) {
> + dev_err(dev, "failed to create PHY\n");
> + return PTR_ERR(phy->phy);
> + }
> +
> + phy_set_drvdata(phy->phy, phy);
> + dev_set_drvdata(dev, phy);
> + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +
> + return PTR_ERR_OR_ZERO(phy_provider);
> +}
> +
> +static const struct of_device_id sun9i_usb_phy_of_match[] = {
> + { .compatible = "allwinner,sun9i-a80-usb-phy" },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
> +
> +static struct platform_driver sun9i_usb_phy_driver = {
> + .probe = sun9i_usb_phy_probe,
> + .driver = {
> + .of_match_table = sun9i_usb_phy_of_match,
> + .name = "sun9i-usb-phy",
> + }
> +};
> +module_platform_driver(sun9i_usb_phy_driver);
> +
> +MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
> +MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
> +MODULE_LICENSE("GPL v2");

Thanks!
Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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