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Date: Tue, 1 Sep 2015 17:23:12 +0200
From: Alban Bedel <albeu@...e.fr>
To: linux-mips@...ux-mips.org
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Ralf Baechle <ralf@...ux-mips.org>,
Kishon Vijay Abraham I <kishon@...com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Alban Bedel <albeu@...e.fr>
Subject: [PATCH 2/4] phy: Add a driver for the ATH79 USB phy
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.
Signed-off-by: Alban Bedel <albeu@...e.fr>
---
drivers/phy/Kconfig | 8 +++
drivers/phy/Makefile | 1 +
drivers/phy/phy-ath79-usb.c | 115 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 124 insertions(+)
create mode 100644 drivers/phy/phy-ath79-usb.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 47da573..aa950a7 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -15,6 +15,14 @@ config GENERIC_PHY
phy users can obtain reference to the PHY. All the users of this
framework should select this config.
+config PHY_ATH79_USB
+ tristate "Atheros AR71XX/9XXX USB PHY driver"
+ depends on ATH79 || COMPILE_TEST
+ default y if USB_EHCI_HCD_PLATFORM
+ select GENERIC_PHY
+ help
+ Enable this to support the USB PHY on Atheros AR71XX/9XXX SoCs.
+
config PHY_BERLIN_USB
tristate "Marvell Berlin USB PHY Driver"
depends on ARCH_BERLIN && RESET_CONTROLLER && HAS_IOMEM && OF
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index a5b18c1..ba13fcf 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -3,6 +3,7 @@
#
obj-$(CONFIG_GENERIC_PHY) += phy-core.o
+obj-$(CONFIG_PHY_ATH79_USB) += phy-ath79-usb.o
obj-$(CONFIG_PHY_BERLIN_USB) += phy-berlin-usb.o
obj-$(CONFIG_PHY_BERLIN_SATA) += phy-berlin-sata.o
obj-$(CONFIG_PHY_DM816X_USB) += phy-dm816x-usb.o
diff --git a/drivers/phy/phy-ath79-usb.c b/drivers/phy/phy-ath79-usb.c
new file mode 100644
index 0000000..d26aabe
--- /dev/null
+++ b/drivers/phy/phy-ath79-usb.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2015 Alban Bedel <albeu@...e.fr>
+ *
+ * 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/module.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/reset.h>
+
+struct ath79_usb_phy {
+ struct reset_control *reset;
+ struct reset_control *suspend_override;
+};
+
+static int ath79_usb_phy_power_on(struct phy *phy)
+{
+ struct ath79_usb_phy *priv = phy_get_drvdata(phy);
+ int err;
+
+ err = reset_control_deassert(priv->reset);
+ if (err)
+ return err;
+
+ if (priv->suspend_override) {
+ err = reset_control_assert(priv->suspend_override);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int ath79_usb_phy_power_off(struct phy *phy)
+{
+ struct ath79_usb_phy *priv = phy_get_drvdata(phy);
+ int err;
+
+ if (priv->suspend_override) {
+ err = reset_control_deassert(priv->suspend_override);
+ if (err)
+ return err;
+ }
+
+ err = reset_control_assert(priv->reset);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static 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->suspend_override = devm_reset_control_get_optional(
+ &pdev->dev, "usb-suspend-override");
+ if (IS_ERR(priv->suspend_override)) {
+ if (PTR_ERR(priv->suspend_override) == -ENOENT)
+ priv->suspend_override = NULL;
+ else
+ return PTR_ERR(priv->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");
--
2.0.0
--
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