Revert "gpio: gpio-xilinx: Add xgpio_xlate function"

This reverts commit 4eb5574.
In the description of the commit itself specifies the backward
compatibility will be reverted 2022.2.
So reverting the same.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
State: Unupstreamable

drivers/gpio/gpio-xilinx.c

@@ -280,28 +280,6 @@ static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 	return 0;
 }
 
-/**
- * xgpio_xlate - Translate gpio_spec to the GPIO number and flags
- * @gc: Pointer to gpio_chip device structure.
- * @gpiospec:  gpio specifier as found in the device tree
- * @flags: A flags pointer based on binding
- *
- * Return:
- * irq number
- */
-static int xgpio_xlate(struct gpio_chip *gc,
-		       const struct of_phandle_args *gpiospec, u32 *flags)
-{
-	if (gc->of_gpio_n_cells == 3 && flags) {
-		*flags = gpiospec->args[2];
-		dev_warn(gc->parent, "Please convert #gpio-cells=3 to 2\n");
-	}
-	if (gc->of_gpio_n_cells == 2 && flags)
-		*flags = gpiospec->args[1];
-
-	return gpiospec->args[0];
-}
-
 /**
  * xgpio_save_regs - Set initial values of GPIO pins
  * @chip: Pointer to GPIO instance
@@ -617,7 +595,7 @@ static int xgpio_probe(struct platform_device *pdev)
 	if (of_property_read_u32(np, "#gpio-cells", &cells))
 		dev_dbg(&pdev->dev, "Missing gpio-cells property\n");
 
-	if (cells != 2 && cells != 3) {
+	if (cells != 2) {
 		dev_err(&pdev->dev, "#gpio-cells mismatch\n");
 		return -EINVAL;
 	}
@@ -650,7 +628,6 @@ static int xgpio_probe(struct platform_device *pdev)
 	chip->gc.base = -1;
 	chip->gc.ngpio = bitmap_weight(chip->hw_map, 64);
 	chip->gc.parent = &pdev->dev;
-	chip->gc.of_xlate = xgpio_xlate;
 	chip->gc.direction_input = xgpio_dir_in;
 	chip->gc.direction_output = xgpio_dir_out;
 	chip->gc.of_gpio_n_cells = cells;