gpio: Add ACPI support for XLP GPIO controller

Add ACPI support for GPIO controller on Broadcom Vulcan ARM64.
ACPI ID for this device is BRCM9006.

Signed-off-by: Kamlakant Patel <kamlakant.patel@broadcom.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 29 insertions, 7 deletions

diff --git a/drivers/gpio/gpio-xlp.c b/drivers/gpio/gpio-xlp.c
index 6acf8aa3b02d..4620d050e5a8 100644
--- a/drivers/gpio/gpio-xlp.c
+++ b/drivers/gpio/gpio-xlp.c
@@ -19,6 +19,7 @@
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/irqchip/chained_irq.h>
+#include <linux/acpi.h>
 
 /*
  * XLP GPIO has multiple 32 bit registers for each feature where each register
@@ -299,7 +300,6 @@ static int xlp_gpio_probe(struct platform_device *pdev)
         struct gpio_chip *gc;
         struct resource *iores;
         struct xlp_gpio_priv *priv;
-        const struct of_device_id *of_id;
         void __iomem *gpio_base;
         int irq_base, irq, err;
         int ngpio;
@@ -321,13 +321,26 @@ static int xlp_gpio_probe(struct platform_device *pdev)
         if (irq < 0)
                 return irq;
 
-        of_id = of_match_device(xlp_gpio_of_ids, &pdev->dev);
-        if (!of_id) {
-                dev_err(&pdev->dev, "Failed to get soc type!\n");
-                return -ENODEV;
-        }
+        if (pdev->dev.of_node) {
+                const struct of_device_id *of_id;
 
-        soc_type = (uintptr_t) of_id->data;
+                of_id = of_match_device(xlp_gpio_of_ids, &pdev->dev);
+                if (!of_id) {
+                        dev_err(&pdev->dev, "Unable to match OF ID\n");
+                        return -ENODEV;
+                }
+                soc_type = (uintptr_t) of_id->data;
+        } else {
+                const struct acpi_device_id *acpi_id;
+
+                acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
+                                                &pdev->dev);
+                if (!acpi_id || !acpi_id->driver_data) {
+                        dev_err(&pdev->dev, "Unable to match ACPI ID\n");
+                        return -ENODEV;
+                }
+                soc_type = (uintptr_t) acpi_id->driver_data;
+        }
 
         switch (soc_type) {
         case XLP_GPIO_VARIANT_XLP832:
@@ -425,10 +438,19 @@ out_free_desc:
         return err;
 }
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id xlp_gpio_acpi_match[] = {
+        { "BRCM9006", GPIO_VARIANT_VULCAN },
+        {},
+};
+MODULE_DEVICE_TABLE(acpi, xlp_gpio_acpi_match);
+#endif
+
 static struct platform_driver xlp_gpio_driver = {
         .driver         = {
                 .name   = "xlp-gpio",
                 .of_match_table = xlp_gpio_of_ids,
+                .acpi_match_table = ACPI_PTR(xlp_gpio_acpi_match),
         },
         .probe          = xlp_gpio_probe,
 };