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
