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Message-ID: <8052c841-0950-9f03-c21e-0395db198969@ti.com>
Date: Mon, 23 Apr 2018 12:12:52 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: Alban Bedel <albeu@...e.fr>
CC: <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: Add a driver for the ATH79 USB phy
On Sunday 25 March 2018 04:08 AM, Alban Bedel wrote:
> The ATH79 USB phy is very simple, it only have a reset. On some SoC a
> second reset is used to force the phy in suspend mode regardless of the
> USB controller status.
>
> This driver is added to the qualcom directory as atheros is now part
> of qualcom and newer SoC of this familly are marketed under the
> qualcom name.
merged, thanks!
-Kishon
>
> Signed-off-by: Alban Bedel <albeu@...e.fr>
> ---
> MAINTAINERS | 8 +++
> drivers/phy/qualcomm/Kconfig | 11 +++-
> drivers/phy/qualcomm/Makefile | 1 +
> drivers/phy/qualcomm/phy-ath79-usb.c | 108 +++++++++++++++++++++++++++++++++++
> 4 files changed, 127 insertions(+), 1 deletion(-)
> create mode 100644 drivers/phy/qualcomm/phy-ath79-usb.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 73c0cda..ce5ecd6 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2294,6 +2294,14 @@ S: Maintained
> F: drivers/gpio/gpio-ath79.c
> F: Documentation/devicetree/bindings/gpio/gpio-ath79.txt
>
> +ATHEROS 71XX/9XXX USB PHY DRIVER
> +M: Alban Bedel <albeu@...e.fr>
> +W: https://github.com/AlbanBedel/linux
> +T: git git://github.com/AlbanBedel/linux
> +S: Maintained
> +F: drivers/phy/qualcomm/phy-ath79-usb.c
> +F: Documentation/devicetree/bindings/phy/phy-ath79-usb.txt
> +
> ATHEROS ATH GENERIC UTILITIES
> M: "Luis R. Rodriguez" <mcgrof@...not-panic.com>
> L: linux-wireless@...r.kernel.org
> diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig
> index 7bfa64b..632a0e7 100644
> --- a/drivers/phy/qualcomm/Kconfig
> +++ b/drivers/phy/qualcomm/Kconfig
> @@ -1,6 +1,15 @@
> #
> -# Phy drivers for Qualcomm platforms
> +# Phy drivers for Qualcomm and Atheros platforms
> #
> +config PHY_ATH79_USB
> + tristate "Atheros AR71XX/9XXX USB PHY driver"
> + depends on OF && (ATH79 || COMPILE_TEST)
> + default y if USB_EHCI_HCD_PLATFORM || USB_OHCI_HCD_PLATFORM
> + select RESET_CONTROLLER
> + select GENERIC_PHY
> + help
> + Enable this to support the USB PHY on Atheros AR71XX/9XXX SoCs.
> +
> config PHY_QCOM_APQ8064_SATA
> tristate "Qualcomm APQ8064 SATA SerDes/PHY driver"
> depends on ARCH_QCOM
> diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile
> index 9abb789..deb831f4 100644
> --- a/drivers/phy/qualcomm/Makefile
> +++ b/drivers/phy/qualcomm/Makefile
> @@ -1,4 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_PHY_ATH79_USB) += phy-ath79-usb.o
> obj-$(CONFIG_PHY_QCOM_APQ8064_SATA) += phy-qcom-apq8064-sata.o
> obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o
> obj-$(CONFIG_PHY_QCOM_QMP) += phy-qcom-qmp.o
> diff --git a/drivers/phy/qualcomm/phy-ath79-usb.c b/drivers/phy/qualcomm/phy-ath79-usb.c
> new file mode 100644
> index 0000000..6fd6e07
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-ath79-usb.c
> @@ -0,0 +1,108 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Atheros AR71XX/9XXX USB PHY driver
> + *
> + * Copyright (C) 2015-2018 Alban Bedel <albeu@...e.fr>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/phy/phy.h>
> +#include <linux/reset.h>
> +
> +struct ath79_usb_phy {
> + struct reset_control *reset;
> + /* The suspend override logic is inverted, hence the no prefix
> + * to make the code a bit easier to understand.
> + */
> + struct reset_control *no_suspend_override;
> +};
> +
> +static int ath79_usb_phy_power_on(struct phy *phy)
> +{
> + struct ath79_usb_phy *priv = phy_get_drvdata(phy);
> + int err = 0;
> +
> + if (priv->no_suspend_override) {
> + err = reset_control_assert(priv->no_suspend_override);
> + if (err)
> + return err;
> + }
> +
> + err = reset_control_deassert(priv->reset);
> + if (err && priv->no_suspend_override)
> + reset_control_assert(priv->no_suspend_override);
> +
> + return err;
> +}
> +
> +static int ath79_usb_phy_power_off(struct phy *phy)
> +{
> + struct ath79_usb_phy *priv = phy_get_drvdata(phy);
> + int err = 0;
> +
> + err = reset_control_assert(priv->reset);
> + if (err)
> + return err;
> +
> + if (priv->no_suspend_override) {
> + err = reset_control_deassert(priv->no_suspend_override);
> + if (err)
> + reset_control_deassert(priv->reset);
> + }
> +
> + return err;
> +}
> +
> +static const struct phy_ops ath79_usb_phy_ops = {
> + .power_on = ath79_usb_phy_power_on,
> + .power_off = ath79_usb_phy_power_off,
> + .owner = THIS_MODULE,
> +};
> +
> +static int ath79_usb_phy_probe(struct platform_device *pdev)
> +{
> + struct ath79_usb_phy *priv;
> + struct phy *phy;
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->reset = devm_reset_control_get(&pdev->dev, "usb-phy");
> + if (IS_ERR(priv->reset))
> + return PTR_ERR(priv->reset);
> +
> + priv->no_suspend_override = devm_reset_control_get_optional(
> + &pdev->dev, "usb-suspend-override");
> + if (IS_ERR(priv->no_suspend_override))
> + return PTR_ERR(priv->no_suspend_override);
> +
> + phy = devm_phy_create(&pdev->dev, NULL, &ath79_usb_phy_ops);
> + if (IS_ERR(phy))
> + return PTR_ERR(phy);
> +
> + phy_set_drvdata(phy, priv);
> +
> + return PTR_ERR_OR_ZERO(devm_of_phy_provider_register(
> + &pdev->dev, of_phy_simple_xlate));
> +}
> +
> +static const struct of_device_id ath79_usb_phy_of_match[] = {
> + { .compatible = "qca,ar7100-usb-phy" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, ath79_usb_phy_of_match);
> +
> +static struct platform_driver ath79_usb_phy_driver = {
> + .probe = ath79_usb_phy_probe,
> + .driver = {
> + .of_match_table = ath79_usb_phy_of_match,
> + .name = "ath79-usb-phy",
> + }
> +};
> +module_platform_driver(ath79_usb_phy_driver);
> +
> +MODULE_DESCRIPTION("ATH79 USB PHY driver");
> +MODULE_AUTHOR("Alban Bedel <albeu@...e.fr>");
> +MODULE_LICENSE("GPL");
>
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