[PATCH v4 2/2] serial: pl011: Add reg-io-width parameters

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Some of the implementations can read only 32 bits because of
the interface limitations of the port they are connected to.
Add a parameter reg-io-width for supporting such platforms.

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xxxxxxx>
---
v4:
No change

 drivers/tty/serial/amba-pl011.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 15f0e4d88c5a..033bf8699540 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2777,6 +2777,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
 	struct uart_amba_port *uap;
 	struct vendor_data *vendor = id->data;
 	int portnr, ret;
+	u32 val;
 
 	portnr = pl011_find_free_port();
 	if (portnr < 0)
@@ -2801,6 +2802,21 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
 	uap->port.rs485_supported = pl011_rs485_supported;
 	snprintf(uap->type, sizeof(uap->type), "PL011 rev%u", amba_rev(dev));
 
+	if (device_property_read_u32(&dev->dev, "reg-io-width", &val) == 0) {
+		switch (val) {
+		case 1:
+			uap->port.iotype = UPIO_MEM;
+			break;
+		case 4:
+			uap->port.iotype = UPIO_MEM32;
+			break;
+		default:
+			dev_warn(&dev->dev, "unsupported reg-io-width (%d)\n",
+				 val);
+			return -EINVAL;
+		}
+	}
+
 	ret = pl011_setup_port(&dev->dev, uap, &dev->res, portnr);
 	if (ret)
 		return ret;
-- 
2.17.1




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