gpiolib / ACPI: add ACPI support for gpiod_get_index()

gpiod_get_index() and gpiod_get() are now the new preferred way to request
GPIOs. Add support for finding the corresponding GPIO descriptor from ACPI
namespace.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 9263c7b359b7..bee93c8c2361 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -10,6 +10,7 @@
 #include <linux/seq_file.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
+#include <linux/acpi_gpio.h>
 #include <linux/idr.h>
 #include <linux/slab.h>
 
@@ -2260,6 +2261,12 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 }
 #endif
 
+static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id,
+                                        unsigned int idx, unsigned long *flags)
+{
+        return acpi_get_gpiod_by_index(dev, idx, NULL);
+}
+
 static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
                                     unsigned int idx, unsigned long *flags)
 {
@@ -2361,6 +2368,9 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
         if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) {
                 dev_dbg(dev, "using device tree for GPIO lookup\n");
                 desc = of_find_gpio(dev, con_id, idx, &flags);
+        } else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) {
+                dev_dbg(dev, "using ACPI for GPIO lookup\n");
+                desc = acpi_find_gpio(dev, con_id, idx, &flags);
         } else {
                 dev_dbg(dev, "using lookup tables for GPIO lookup");
                 desc = gpiod_find(dev, con_id, idx, &flags);