mfd: intel_soc_pmic_core: Add lookup table for Panel Control as GPIO signal

On some Intel SoC platforms, the panel enable/disable signals are
controlled by CRC PMIC. Add those control as a new GPIO in a lookup
table for gpio-crystalcove chip during CRC driver load

CC: Samuel Ortiz <[e-mail]>
Cc: Linus Walleij <[e-mail]>
Cc: Alexandre Courbot <[e-mail]>
Cc: Thierry Reding <[e-mail]>
Acked-by: Lee Jones <[e-mail]>
Acked-by: Linus Walleij <[e-mail]>
Tested-by: Ville Syrjälä <[e-mail]>
Signed-off-by: Shobhit Kumar <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>

drivers/mfd/intel_soc_pmic_core.c

···
 #include <linux/acpi.h>
 #include <linux/regmap.h>
 #include <linux/mfd/intel_soc_pmic.h>
+#include <linux/gpio/machine.h>
 #include "intel_soc_pmic_core.h"
+
+/* Lookup table for the Panel Enable/Disable line as GPIO signals */
+static struct gpiod_lookup_table panel_gpio_table = {
+	/* Intel GFX is consumer */
+	.dev_id = "0000:00:02.0",
+	.table = {
+		/* Panel EN/DISABLE */
+		GPIO_LOOKUP("gpio_crystalcove", 94, "panel", GPIO_ACTIVE_HIGH),
+	},
+};
 
 static int intel_soc_pmic_find_gpio_irq(struct device *dev)
 {
···
 	if (ret)
 		dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
 
+	/* Add lookup table binding for Panel Control to the GPIO Chip */
+	gpiod_add_lookup_table(&panel_gpio_table);
+
 	ret = mfd_add_devices(dev, -1, config->cell_dev,
 			      config->n_cell_devs, NULL, 0,
 			      regmap_irq_get_domain(pmic->irq_chip_data));
···
 	struct intel_soc_pmic *pmic = dev_get_drvdata(&i2c->dev);
 
 	regmap_del_irq_chip(pmic->irq, pmic->irq_chip_data);
+
+	/* Remove lookup table for Panel Control from the GPIO Chip */
+	gpiod_remove_lookup_table(&panel_gpio_table);
 
 	mfd_remove_devices(&i2c->dev);