drivers/mfd: 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

v2: Make the lookup table static (Thierry)
    Remove the lookup table during driver remove (Thierry)

CC: Samuel Ortiz <sameo@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>

diff --git a/drivers/mfd/intel_soc_pmic_core.c b/drivers/mfd/intel_soc_pmic_core.c
index 80cef04..73d262e 100644 (file)
--- a/drivers/mfd/intel_soc_pmic_core.c
+++ b/drivers/mfd/intel_soc_pmic_core.c
@@ -24,8 +24,19 @@
 #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),
+       },
+};
+
 /*
  * On some boards the PMIC interrupt may come from a GPIO line.
  * Try to lookup the ACPI table and see if such connection exists. If not,
@@ -85,6 +96,9 @@ static int intel_soc_pmic_i2c_probe(struct i2c_client *i2c,
        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));
@@ -104,6 +118,9 @@ static int intel_soc_pmic_i2c_remove(struct i2c_client *i2c)
 
        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);
 
        return 0;