ARM: omap2: Get USB hub reset GPIO from descriptor

This switches the USB hub GPIO reset line handling in the
OMAP2 pdata quirks over to using GPIO descriptors to avoid using
the global GPIO numberspace.

Since the GPIOs are exported and assumedly used by some kind
of userspace we cannot simply use hogs in the device tree.

Fixes: 92bf78b3 ("gpio: omap: use dynamic allocation of base")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/mach-omap2/pdata-quirks.c

@@ -98,31 +98,43 @@ static struct iommu_platform_data omap3_iommu_isp_pdata = {
 };
 #endif
 
-static void __init omap3_sbc_t3x_usb_hub_init(int gpio, char *hub_name)
+static void __init omap3_sbc_t3x_usb_hub_init(char *hub_name, int idx)
 {
-	int err = gpio_request_one(gpio, GPIOF_OUT_INIT_LOW, hub_name);
+	struct gpio_desc *d;
 
-	if (err) {
-		pr_err("SBC-T3x: %s reset gpio request failed: %d\n",
-			hub_name, err);
+	/* This asserts the RESET line (reverse polarity) */
+	d = gpiod_get_index(NULL, "reset", idx, GPIOD_OUT_HIGH);
+	if (IS_ERR(d)) {
+		pr_err("Unable to get T3x USB reset GPIO descriptor\n");
 		return;
 	}
-
-	gpiod_export(gpio_to_desc(gpio), 0);
-
+	gpiod_set_consumer_name(d, hub_name);
+	gpiod_export(d, 0);
 	udelay(10);
-	gpio_set_value(gpio, 1);
+	/* De-assert RESET */
+	gpiod_set_value(d, 0);
 	msleep(1);
 }
 
+static struct gpiod_lookup_table omap3_sbc_t3x_usb_gpio_table = {
+	.dev_id = NULL,
+	.table = {
+		GPIO_LOOKUP_IDX("gpio-160-175", 7, "reset", 0,
+				GPIO_ACTIVE_LOW),
+		{ }
+	},
+};
+
 static void __init omap3_sbc_t3730_legacy_init(void)
 {
-	omap3_sbc_t3x_usb_hub_init(167, "sb-t35 usb hub");
+	gpiod_add_lookup_table(&omap3_sbc_t3x_usb_gpio_table);
+	omap3_sbc_t3x_usb_hub_init("sb-t35 usb hub", 0);
 }
 
 static void __init omap3_sbc_t3530_legacy_init(void)
 {
-	omap3_sbc_t3x_usb_hub_init(167, "sb-t35 usb hub");
+	gpiod_add_lookup_table(&omap3_sbc_t3x_usb_gpio_table);
+	omap3_sbc_t3x_usb_hub_init("sb-t35 usb hub", 0);
 }
 
 static void __init omap3_evm_legacy_init(void)
@@ -187,10 +199,22 @@ static void __init omap3_sbc_t3517_wifi_init(void)
 	gpio_set_value(cm_t3517_wlan_gpios[1].gpio, 0);
 }
 
+static struct gpiod_lookup_table omap3_sbc_t3517_usb_gpio_table = {
+	.dev_id = NULL,
+	.table = {
+		GPIO_LOOKUP_IDX("gpio-144-159", 8, "reset", 0,
+				GPIO_ACTIVE_LOW),
+		GPIO_LOOKUP_IDX("gpio-96-111", 2, "reset", 1,
+				GPIO_ACTIVE_LOW),
+		{ }
+	},
+};
+
 static void __init omap3_sbc_t3517_legacy_init(void)
 {
-	omap3_sbc_t3x_usb_hub_init(152, "cm-t3517 usb hub");
-	omap3_sbc_t3x_usb_hub_init(98, "sb-t35 usb hub");
+	gpiod_add_lookup_table(&omap3_sbc_t3517_usb_gpio_table);
+	omap3_sbc_t3x_usb_hub_init("cm-t3517 usb hub", 0);
+	omap3_sbc_t3x_usb_hub_init("sb-t35 usb hub", 1);
 	am35xx_emac_reset();
 	hsmmc2_internal_input_clk();
 	omap3_sbc_t3517_wifi_init();