mmc: host: atmel-mci: Add support for non-removable slots

Add support for non-removable slots which have no card detection GPIO
and which should not be polled for a card change.

Signed-off-by: Timo Kokkonen <[e-mail]>
Acked-by: Ludovic Desroches <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/atmel-mci.c

···
 		pdata->slot[slot_id].detect_is_active_high =
 			of_property_read_bool(cnp, "cd-inverted");
 
+		pdata->slot[slot_id].non_removable =
+			of_property_read_bool(cnp, "non-removable");
+
 		pdata->slot[slot_id].wp_pin =
 			of_get_named_gpio(cnp, "wp-gpios", 0);
 	}
···
 		}
 	}
 
-	if (!gpio_is_valid(slot->detect_pin))
-		mmc->caps |= MMC_CAP_NEEDS_POLL;
+	if (!gpio_is_valid(slot->detect_pin)) {
+		if (slot_data->non_removable)
+			mmc->caps |= MMC_CAP_NONREMOVABLE;
+		else
+			mmc->caps |= MMC_CAP_NEEDS_POLL;
+	}
 
 	if (gpio_is_valid(slot->wp_pin)) {
 		if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,

include/linux/atmel-mci.h

···
  * @detect_pin: GPIO pin wired to the card detect switch
  * @wp_pin: GPIO pin wired to the write protect sensor
  * @detect_is_active_high: The state of the detect pin when it is active
+ * @non_removable: The slot is not removable, only detect once
  *
  * If a given slot is not present on the board, @bus_width should be
  * set to 0. The other fields are ignored in this case.
···
 	int			detect_pin;
 	int			wp_pin;
 	bool			detect_is_active_high;
+	bool			non_removable;
 };
 
 /**