ARM/musb: omap2: Remove global GPIO numbers from TUSB6010

The TUSB6010 (MUSB) device is picking up some GPIO lines
hardcoded by number and passing on to the TUSB6010 device
when registering it.

Instead of nasty workarounds, provide a GPIO descriptor
table and then make the TUSB6010 MUSB glue driver pick up
the GPIO lines directly, convert it to an IRQ and pass down
to the MUSB driver. OMAP2 is the only system using the
TUSB6010.

Stash the GPIO descriptors in the glue layer and use
then to power up and down the TUSB6010 on-demand, instead
of using boardfile callbacks.

Since the OMAP2 boards are the only boards using the
.set_power() and .board_set_power() callbacks, we can
just delete them as the power is now handled directly
in the TUSB6010 glue code.

Cc: Bin Liu <b-liu@ti.com>
Cc: linux-usb@vger.kernel.org
Fixes: 92bf78b33b0b ("gpio: omap: use dynamic allocation of base")
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 39 insertions, 17 deletions

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index d162afbbe19f..ecbd3784bec3 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2330,7 +2330,6 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
 
 	spin_lock_init(&musb->lock);
 	spin_lock_init(&musb->list_lock);
-	musb->board_set_power = plat->set_power;
 	musb->min_power = plat->min_power;
 	musb->ops = plat->platform_ops;
 	musb->port_mode = plat->mode;
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index b7588d11cfc5..91b5b6b66f96 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -352,8 +352,6 @@ struct musb {
 	u16 epmask;
 	u8 nr_endpoints;
 
-	int			(*board_set_power)(int state);
-
 	u8			min_power;	/* vbus for periph, in mA/2 */
 
 	enum musb_mode		port_mode;
diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index a1f29dbc62e6..cbc707fe570f 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -11,6 +11,8 @@
  *   interface.
  */
 
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -30,6 +32,8 @@ struct tusb6010_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
 	struct platform_device	*phy;
+	struct gpio_desc	*enable;
+	struct gpio_desc	*intpin;
 };
 
 static void tusb_musb_set_vbus(struct musb *musb, int is_on);
@@ -1021,16 +1025,29 @@ static void tusb_setup_cpu_interface(struct musb *musb)
 
 static int tusb_musb_start(struct musb *musb)
 {
+	struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
 	void __iomem	*tbase = musb->ctrl_base;
-	int		ret = 0;
 	unsigned long	flags;
 	u32		reg;
+	int		i;
 
-	if (musb->board_set_power)
-		ret = musb->board_set_power(1);
-	if (ret != 0) {
-		printk(KERN_ERR "tusb: Cannot enable TUSB6010\n");
-		return ret;
+	/*
+	 * Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and
+	 * 1.5 V voltage regulators of PM companion chip. Companion chip will then
+	 * provide then PGOOD signal to TUSB6010 which will release it from reset.
+	 */
+	gpiod_set_value(glue->enable, 1);
+	msleep(1);
+
+	/* Wait for 100ms until TUSB6010 pulls INT pin down */
+	i = 100;
+	while (i && gpiod_get_value(glue->intpin)) {
+		msleep(1);
+		i--;
+	}
+	if (!i) {
+		pr_err("tusb: Powerup respones failed\n");
+		return -ENODEV;
 	}
 
 	spin_lock_irqsave(&musb->lock, flags);
@@ -1083,8 +1100,8 @@ static int tusb_musb_start(struct musb *musb)
 err:
 	spin_unlock_irqrestore(&musb->lock, flags);
 
-	if (musb->board_set_power)
-		musb->board_set_power(0);
+	gpiod_set_value(glue->enable, 0);
+	msleep(10);
 
 	return -ENODEV;
 }
@@ -1158,11 +1175,13 @@ done:
 
 static int tusb_musb_exit(struct musb *musb)
 {
+	struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
+
 	del_timer_sync(&musb->dev_timer);
 	the_musb = NULL;
 
-	if (musb->board_set_power)
-		musb->board_set_power(0);
+	gpiod_set_value(glue->enable, 0);
+	msleep(10);
 
 	iounmap(musb->sync_va);
 
@@ -1218,6 +1237,15 @@ static int tusb_probe(struct platform_device *pdev)
 
 	glue->dev			= &pdev->dev;
 
+	glue->enable = devm_gpiod_get(glue->dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(glue->enable))
+		return dev_err_probe(glue->dev, PTR_ERR(glue->enable),
+				     "could not obtain power on/off GPIO\n");
+	glue->intpin = devm_gpiod_get(glue->dev, "int", GPIOD_IN);
+	if (IS_ERR(glue->intpin))
+		return dev_err_probe(glue->dev, PTR_ERR(glue->intpin),
+				     "could not obtain INT GPIO\n");
+
 	pdata->platform_ops		= &tusb_ops;
 
 	usb_phy_generic_register();
@@ -1236,10 +1264,7 @@ static int tusb_probe(struct platform_device *pdev)
 	musb_resources[1].end = pdev->resource[1].end;
 	musb_resources[1].flags = pdev->resource[1].flags;
 
-	musb_resources[2].name = pdev->resource[2].name;
-	musb_resources[2].start = pdev->resource[2].start;
-	musb_resources[2].end = pdev->resource[2].end;
-	musb_resources[2].flags = pdev->resource[2].flags;
+	musb_resources[2] = DEFINE_RES_IRQ_NAMED(gpiod_to_irq(glue->intpin), "mc");
 
 	pinfo = tusb_dev_info;
 	pinfo.parent = &pdev->dev;