[PATCH v2 08/11] usb: ohci-at91: Add DT support

[Andrey Smirnov <andrew.smirnov@gmail.com>]

Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 arch/arm/mach-at91/include/mach/board.h |  6 ++-
 drivers/usb/host/ohci-at91.c            | 93 ++++++++++++++++++++++++++++++++-
 2 files changed, 95 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-at91/include/mach/board.h b/arch/arm/mach-at91/include/mach/board.h
index 491b220..5d76e00 100644
--- a/arch/arm/mach-at91/include/mach/board.h
+++ b/arch/arm/mach-at91/include/mach/board.h
@@ -32,11 +32,13 @@
 
 void at91_set_main_clock(unsigned long rate);
 
+#define AT91_MAX_USBH_PORTS	3
+
  /* USB Host */
 struct at91_usbh_data {
 	u8		ports;		/* number of ports on root hub */
-	int		vbus_pin[2];	/* port power-control pin */
-	u8	vbus_pin_active_low[2];	/* vbus polarity */
+	int		vbus_pin[AT91_MAX_USBH_PORTS];	/* port power-control pin */
+	u8	vbus_pin_active_low[AT91_MAX_USBH_PORTS];	/* vbus polarity */
 };
 extern void __init at91_add_device_usbh_ohci(struct at91_usbh_data *data);
 extern void __init at91_add_device_usbh_ehci(struct at91_usbh_data *data);
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 5f74526..1013ba3 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -23,10 +23,18 @@
 #include <usb/usb.h>
 #include <usb/usb_defs.h>
 #include <errno.h>
+#include <gpio.h>
+#include <of_gpio.h>
 #include <io.h>
 
+#include <mach/board.h>
+
 #include "ohci.h"
 
+#define at91_for_each_port(index)					\
+	for ((index) = 0; (index) < AT91_MAX_USBH_PORTS; (index)++)
+
+
 struct ohci_at91_priv {
 	struct device_d *dev;
 	struct clk *iclk;
@@ -59,6 +67,59 @@ static void at91_stop_clock(struct ohci_at91_priv *ohci_at91)
 	clk_disable(ohci_at91->iclk);
 }
 
+static int at91_ohci_probe_dt(struct device_d *dev)
+{
+	u32 ports;
+	int i, ret, gpio;
+	enum of_gpio_flags flags;
+	struct at91_usbh_data *pdata;
+	struct device_node *np = dev->device_node;
+
+	pdata = xzalloc(sizeof(*pdata));
+	dev->platform_data = pdata;
+
+	if (!of_property_read_u32(np, "num-ports", &ports)) {
+		pdata->ports = ports;
+	} else {
+		dev_err(dev, "Failed to read 'num-ports' property\n");
+		return -EINVAL;
+	}
+
+	at91_for_each_port(i) {
+		/*
+		 * do not configure PIO if not in relation with
+		 * real USB port on board
+		 */
+		if (i >= pdata->ports) {
+			pdata->vbus_pin[i] = -EINVAL;
+			continue;
+		}
+
+		gpio = of_get_named_gpio_flags(np, "atmel,vbus-gpio", i,
+					       &flags);
+		pdata->vbus_pin[i] = gpio;
+		if (!gpio_is_valid(gpio))
+			continue;
+		pdata->vbus_pin_active_low[i] = flags & OF_GPIO_ACTIVE_LOW;
+
+		ret = gpio_request(gpio, "ohci_vbus");
+		if (ret) {
+			dev_err(dev, "can't request vbus gpio %d\n", gpio);
+			continue;
+		}
+		ret = gpio_direction_output(gpio,
+					    !pdata->vbus_pin_active_low[i]);
+		if (ret) {
+			dev_err(dev, "can't put vbus gpio %d as output %d\n",
+				gpio, !pdata->vbus_pin_active_low[i]);
+			gpio_free(gpio);
+			continue;
+		}
+	}
+
+	return 0;
+}
+
 static int at91_ohci_probe(struct device_d *dev)
 {
 	int ret;
@@ -68,6 +129,12 @@ static int at91_ohci_probe(struct device_d *dev)
 	dev->priv = ohci_at91;
 	ohci_at91->dev = dev;
 
+	if (dev->device_node) {
+		ret = at91_ohci_probe_dt(dev);
+		if (ret < 0)
+			return ret;
+	}
+
 	io = dev_get_resource(dev, IORESOURCE_MEM, 0);
 	if (IS_ERR(io)) {
 		dev_err(dev, "Failed to get IORESOURCE_MEM\n");
@@ -75,13 +142,13 @@ static int at91_ohci_probe(struct device_d *dev)
 	}
 	ohci_at91->regs = IOMEM(io->start);
 
-	ohci_at91->iclk = clk_get(NULL, "ohci_clk");
+	ohci_at91->iclk = clk_get(dev, "ohci_clk");
 	if (IS_ERR(ohci_at91->iclk)) {
 		dev_err(dev, "Failed to get 'ohci_clk'\n");
 		return PTR_ERR(ohci_at91->iclk);
 	}
 
-	ohci_at91->fclk = clk_get(NULL, "uhpck");
+	ohci_at91->fclk = clk_get(dev, "uhpck");
 	if (IS_ERR(ohci_at91->fclk)) {
 		dev_err(dev, "Failed to get 'uhpck'\n");
 		return PTR_ERR(ohci_at91->fclk);
@@ -107,6 +174,7 @@ static int at91_ohci_probe(struct device_d *dev)
 
 static void at91_ohci_remove(struct device_d *dev)
 {
+	struct at91_usbh_data *pdata = dev->platform_data;
 	struct ohci_at91_priv *ohci_at91 = dev->priv;
 
 	/*
@@ -118,11 +186,32 @@ static void at91_ohci_remove(struct device_d *dev)
 	 * Stop the USB clocks.
 	 */
 	at91_stop_clock(ohci_at91);
+
+	if (pdata) {
+		bool active_low;
+		int  i, gpio;
+
+		at91_for_each_port(i) {
+			gpio = pdata->vbus_pin[i];
+			active_low = pdata->vbus_pin_active_low[i];
+
+			if (gpio_is_valid(gpio)) {
+				gpio_set_value(gpio, active_low);
+				gpio_free(gpio);
+			}
+		}
+	}
 }
 
+static const struct of_device_id at91_ohci_dt_ids[] = {
+	{ .compatible = "atmel,at91rm9200-ohci" },
+	{ /* sentinel */ }
+};
+
 static struct driver_d at91_ohci_driver = {
 	.name = "at91_ohci",
 	.probe = at91_ohci_probe,
 	.remove = at91_ohci_remove,
+	.of_compatible = DRV_OF_COMPAT(at91_ohci_dt_ids),
 };
 device_platform_driver(at91_ohci_driver);
-- 
2.9.3


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