usb: isp1301-omap: Convert to use GPIO descriptors

This modernized the ISP1301 a bit by switching it to provide
a GPIO descriptor from the H2 board if used.

Cc: Tony Lindgren <tony@atomide.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20201123102346.48284-1-linus.walleij@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

arch/arm/mach-omap1/board-h2.c

@@ -16,6 +16,7 @@
  * Copyright (C) 2004 Nokia Corporation by Imre Deak <imre.deak@nokia.com>
  */
 #include <linux/gpio.h>
+#include <linux/gpio/machine.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/delay.h>
@@ -46,6 +47,9 @@
 #include "common.h"
 #include "board-h2.h"
 
+/* The first 16 SoC GPIO lines are on this GPIO chip */
+#define OMAP_GPIO_LABEL			"gpio-0-15"
+
 /* At OMAP1610 Innovator the Ethernet is directly connected to CS1 */
 #define OMAP1610_ETHR_START		0x04000300
 
@@ -334,7 +338,19 @@ static struct i2c_board_info __initdata h2_i2c_board_info[] = {
 		I2C_BOARD_INFO("tps65010", 0x48),
 		.platform_data	= &tps_board,
 	}, {
-		I2C_BOARD_INFO("isp1301_omap", 0x2d),
+		.type = "isp1301_omap",
+		.addr = 0x2d,
+		.dev_name = "isp1301",
+	},
+};
+
+static struct gpiod_lookup_table isp1301_gpiod_table = {
+	.dev_id = "isp1301",
+	.table = {
+		/* Active low since the irq triggers on falling edge */
+		GPIO_LOOKUP(OMAP_GPIO_LABEL, 2,
+			    NULL, GPIO_ACTIVE_LOW),
+		{ },
 	},
 };
 
@@ -406,8 +422,10 @@ static void __init h2_init(void)
 	h2_smc91x_resources[1].end = gpio_to_irq(0);
 	platform_add_devices(h2_devices, ARRAY_SIZE(h2_devices));
 	omap_serial_init();
+
+	/* ISP1301 IRQ wired at M14 */
+	omap_cfg_reg(M14_1510_GPIO2);
 	h2_i2c_board_info[0].irq = gpio_to_irq(58);
-	h2_i2c_board_info[1].irq = gpio_to_irq(2);
 	omap_register_i2c_bus(1, 100, h2_i2c_board_info,
 			      ARRAY_SIZE(h2_i2c_board_info));
 	omap1_usb_init(&h2_usb_config);

drivers/usb/phy/phy-isp1301-omap.c

@@ -1208,9 +1208,6 @@ static int isp1301_remove(struct i2c_client *i2c)
 #ifdef	CONFIG_USB_OTG
 	otg_unbind(isp);
 #endif
-	if (machine_is_omap_h2())
-		gpio_free(2);
-
 	set_bit(WORK_STOP, &isp->todo);
 	del_timer_sync(&isp->timer);
 	flush_work(&isp->work);
@@ -1480,6 +1477,7 @@ isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 {
 	int			status;
 	struct isp1301		*isp;
+	int irq;
 
 	if (the_transceiver)
 		return 0;
@@ -1543,20 +1541,27 @@ isp1301_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
 #endif
 
 	if (machine_is_omap_h2()) {
+		struct gpio_desc *gpiod;
+
 		/* full speed signaling by default */
 		isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1,
 			MC1_SPEED);
 		isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2,
 			MC2_SPD_SUSP_CTRL);
 
-		/* IRQ wired at M14 */
-		omap_cfg_reg(M14_1510_GPIO2);
-		if (gpio_request(2, "isp1301") == 0)
-			gpio_direction_input(2);
+		gpiod = devm_gpiod_get(&i2c->dev, NULL, GPIOD_IN);
+		if (IS_ERR(gpiod)) {
+			dev_err(&i2c->dev, "cannot obtain H2 GPIO\n");
+			goto fail;
+		}
+		gpiod_set_consumer_name(gpiod, "isp1301");
+		irq = gpiod_to_irq(gpiod);
 		isp->irq_type = IRQF_TRIGGER_FALLING;
+	} else {
+		irq = i2c->irq;
 	}
 
-	status = request_irq(i2c->irq, isp1301_irq,
+	status = request_irq(irq, isp1301_irq,
 			isp->irq_type, DRIVER_NAME, isp);
 	if (status < 0) {
 		dev_dbg(&i2c->dev, "can't get IRQ %d, err %d\n",