[PATCH V4 4/8] phy: st-miphy-40lp: Add skeleton driver

[Pratyush Anand]

ST miphy-40lp supports PCIe, SATA and Super Speed USB. This driver adds
skeleton support for the same.

Currently phy ops are returning -EINVAL. They can be elaborated
depending on the SOC being supported in future.

Signed-off-by: Pratyush Anand <pratyush.anand@xxxxxx>
Tested-by: Mohit Kumar <mohit.kumar@xxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
Cc: spear-devel@xxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 .../devicetree/bindings/phy/st-miphy40lp.txt       |  12 ++
 drivers/phy/Kconfig                                |   6 +
 drivers/phy/Makefile                               |   1 +
 drivers/phy/phy-miphy40lp.c                        | 174 +++++++++++++++++++++
 4 files changed, 193 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/st-miphy40lp.txt
 create mode 100644 drivers/phy/phy-miphy40lp.c

diff --git a/Documentation/devicetree/bindings/phy/st-miphy40lp.txt b/Documentation/devicetree/bindings/phy/st-miphy40lp.txt
new file mode 100644
index 0000000..d0c7096
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/st-miphy40lp.txt
@@ -0,0 +1,12 @@
+Required properties:
+- compatible : should be "st,miphy40lp-phy"
+	Other supported soc specific compatible:
+		"st,spear1310-miphy"
+		"st,spear1340-miphy"
+- reg : offset and length of the PHY register set.
+- misc: phandle for the syscon node to access misc registers
+- phy-id: Instance id of the phy.
+- #phy-cells : from the generic PHY bindings, must be 1.
+	- 1st cell: phandle to the phy node.
+	- 2nd cell: 0 if phy (in 1st cell) is to be used for SATA, 1 for PCIe
+	  and 2 for Super Speed USB.
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index afa2354..2f58993 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -64,4 +64,10 @@ config BCM_KONA_USB2_PHY
 	help
 	  Enable this to support the Broadcom Kona USB 2.0 PHY.
 
+config PHY_ST_MIPHY40LP
+	tristate "ST MIPHY 40LP driver"
+	help
+	  Support for ST MIPHY 40LP which can be used for PCIe, SATA and Super Speed USB.
+	select GENERIC_PHY
+
 endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index b57c253..c061091 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO)	+= phy-exynos-mipi-video.o
 obj-$(CONFIG_PHY_MVEBU_SATA)		+= phy-mvebu-sata.o
 obj-$(CONFIG_OMAP_USB2)			+= phy-omap-usb2.o
 obj-$(CONFIG_TWL4030_USB)		+= phy-twl4030-usb.o
+obj-$(CONFIG_PHY_ST_MIPHY40LP)		+= phy-miphy40lp.o
diff --git a/drivers/phy/phy-miphy40lp.c b/drivers/phy/phy-miphy40lp.c
new file mode 100644
index 0000000..d478c14
--- /dev/null
+++ b/drivers/phy/phy-miphy40lp.c
@@ -0,0 +1,174 @@
+/*
+ * ST MiPHY-40LP PHY driver
+ *
+ * Copyright (C) 2014 ST Microelectronics
+ * Pratyush Anand <pratyush.anand@xxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+
+enum phy_mode {
+	SATA,
+	PCIE,
+	SS_USB,
+};
+
+struct st_miphy40lp_priv {
+	/* regmap for any soc specific misc registers */
+	struct regmap		*misc;
+	/* phy struct pointer */
+	struct phy		*phy;
+	/* device node pointer */
+	struct device_node	*np;
+	/* phy mode: 0 for SATA 1 for PCIe and 2 for SS-USB */
+	enum phy_mode		mode;
+	/* instance id of this phy */
+	u32			id;
+};
+
+static int miphy40lp_init(struct phy *phy)
+{
+	return -EINVAL;
+}
+
+static int miphy40lp_exit(struct phy *phy)
+{
+	return -EINVAL;
+}
+
+static int miphy40lp_power_off(struct phy *phy)
+{
+	return -EINVAL;
+}
+
+static int miphy40lp_power_on(struct phy *phy)
+{
+	return -EINVAL;
+}
+
+static const struct of_device_id st_miphy40lp_of_match[] = {
+	{ .compatible = "st,miphy40lp-phy" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, st_miphy40lp_of_match);
+
+static struct phy_ops st_miphy40lp_ops = {
+	.init = miphy40lp_init,
+	.exit = miphy40lp_exit,
+	.power_off = miphy40lp_power_off,
+	.power_on = miphy40lp_power_on,
+	.owner		= THIS_MODULE,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int miphy40lp_suspend(struct device *dev)
+{
+	return -EINVAL;
+}
+
+static int miphy40lp_resume(struct device *dev)
+{
+	return -EINVAL;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(miphy40lp_pm_ops, miphy40lp_suspend,
+		miphy40lp_resume);
+
+static struct phy *st_miphy40lp_xlate(struct device *dev,
+					struct of_phandle_args *args)
+{
+	struct st_miphy40lp_priv *phypriv = dev_get_drvdata(dev);
+
+	if (args->args_count < 1) {
+		dev_err(dev, "DT did not pass correct no of args\n");
+		return NULL;
+	}
+
+	phypriv->mode = args->args[0];
+
+	return phypriv->phy;
+}
+
+static int __init st_miphy40lp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct st_miphy40lp_priv *phypriv;
+	struct phy_provider *phy_provider;
+
+	phypriv = devm_kzalloc(dev, sizeof(*phypriv), GFP_KERNEL);
+	if (!phypriv) {
+		dev_err(dev, "can't alloc miphy40lp private date memory\n");
+		return -ENOMEM;
+	}
+
+	phypriv->np = dev->of_node;
+
+	phypriv->misc =
+		syscon_regmap_lookup_by_phandle(dev->of_node, "misc");
+	if (IS_ERR(phypriv->misc)) {
+		dev_err(dev, "failed to find misc regmap\n");
+		return PTR_ERR(phypriv->misc);
+	}
+
+	if (of_property_read_u32(dev->of_node, "phy-id", &phypriv->id)) {
+		dev_err(dev, "failed to find phy id\n");
+		return -EINVAL;
+	}
+
+	phy_provider = devm_of_phy_provider_register(dev, st_miphy40lp_xlate);
+	if (IS_ERR(phy_provider)) {
+		dev_err(dev, "failed to register phy provider\n");
+		return PTR_ERR(phy_provider);
+	}
+
+	phypriv->phy = devm_phy_create(dev, &st_miphy40lp_ops, NULL);
+	if (IS_ERR(phypriv->phy)) {
+		dev_err(dev, "failed to create SATA PCIe PHY\n");
+		return PTR_ERR(phypriv->phy);
+	}
+
+	dev_set_drvdata(dev, phypriv);
+	phy_set_drvdata(phypriv->phy, phypriv);
+
+	return 0;
+}
+
+static int __exit st_miphy40lp_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static struct platform_driver st_miphy40lp_driver = {
+	.remove		= __exit_p(st_miphy40lp_remove),
+	.driver = {
+		.name = "miphy40lp-phy",
+		.owner = THIS_MODULE,
+		.pm = &miphy40lp_pm_ops,
+		.of_match_table = of_match_ptr(st_miphy40lp_of_match),
+	},
+};
+
+static int __init st_miphy40lp_init(void)
+{
+
+	return platform_driver_probe(&st_miphy40lp_driver,
+				st_miphy40lp_probe);
+}
+module_init(st_miphy40lp_init);
+
+MODULE_DESCRIPTION("ST MIPHY-40LP driver");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@xxxxxx>");
+MODULE_LICENSE("GPL v2");
-- 
1.8.1.2

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