ARM: omap1: Make serial wakeup GPIOs use descriptors

The code in serial.c looks up GPIOs corresponding to a line
on the UART when muxed in as GPIO to use this as a wakeup
on serial activity for OMAP1.

Utilize the NULL device to define some board-specific
GPIO lookups and use these to immediately look up the
same GPIOs, set as input and convert to IRQ numbers,
then set these to wakeup IRQs. This is ugly but should work.

This is only needed on the OSK1 and Nokia 770 devices that
use the OMAP16xx.

Fixes: 92bf78b ("gpio: omap: use dynamic allocation of base")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: Linus Walleij

arch/arm/mach-omap1/board-nokia770.c

@@ -294,6 +294,13 @@ static struct gpiod_lookup_table nokia770_irq_gpio_table = {
 		/* GPIO used for tahvo IRQ */
 		GPIO_LOOKUP("gpio-32-47", 8, "tahvo_irq",
 			    GPIO_ACTIVE_HIGH),
+		/* GPIOs used by serial wakeup IRQs */
+		GPIO_LOOKUP_IDX("gpio-32-47", 5, "wakeup", 0,
+			    GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("gpio-16-31", 2, "wakeup", 1,
+			    GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("gpio-48-63", 1, "wakeup", 2,
+			    GPIO_ACTIVE_HIGH),
 		{ }
 	},
 };

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

@@ -364,6 +364,13 @@ static struct gpiod_lookup_table osk_irq_gpio_table = {
 		/* GPIO used by the TPS65010 chip */
 		GPIO_LOOKUP("mpuio", 1, "tps65010",
 			    GPIO_ACTIVE_HIGH),
+		/* GPIOs used for serial wakeup IRQs */
+		GPIO_LOOKUP_IDX("gpio-32-47", 5, "wakeup", 0,
+			    GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("gpio-16-31", 2, "wakeup", 1,
+			    GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP_IDX("gpio-48-63", 1, "wakeup", 2,
+			    GPIO_ACTIVE_HIGH),
 		{ }
 	},
 };

arch/arm/mach-omap1/serial.c

@@ -4,7 +4,8 @@
  *
  * OMAP1 serial support.
  */
-#include <linux/gpio.h>
+#include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -196,39 +197,38 @@ void omap_serial_wake_trigger(int enable)
 	}
 }
 
-static void __init omap_serial_set_port_wakeup(int gpio_nr)
+static void __init omap_serial_set_port_wakeup(int idx)
 {
+	struct gpio_desc *d;
 	int ret;
 
-	ret = gpio_request(gpio_nr, "UART wake");
-	if (ret < 0) {
-		printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
-		       gpio_nr);
+	d = gpiod_get_index(NULL, "wakeup", idx, GPIOD_IN);
+	if (IS_ERR(d)) {
+		pr_err("Unable to get UART wakeup GPIO descriptor\n");
 		return;
 	}
-	gpio_direction_input(gpio_nr);
-	ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt,
+	ret = request_irq(gpiod_to_irq(d), &omap_serial_wake_interrupt,
 			  IRQF_TRIGGER_RISING, "serial wakeup", NULL);
 	if (ret) {
-		gpio_free(gpio_nr);
-		printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
-		       gpio_nr);
+		gpiod_put(d);
+		pr_err("No interrupt for UART%d wake GPIO\n", idx + 1);
 		return;
 	}
-	enable_irq_wake(gpio_to_irq(gpio_nr));
+	enable_irq_wake(gpiod_to_irq(d));
 }
 
+
 int __init omap_serial_wakeup_init(void)
 {
 	if (!cpu_is_omap16xx())
 		return 0;
 
 	if (uart1_ck != NULL)
-		omap_serial_set_port_wakeup(37);
+		omap_serial_set_port_wakeup(0);
 	if (uart2_ck != NULL)
-		omap_serial_set_port_wakeup(18);
+		omap_serial_set_port_wakeup(1);
 	if (uart3_ck != NULL)
-		omap_serial_set_port_wakeup(49);
+		omap_serial_set_port_wakeup(2);
 
 	return 0;
 }