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serial: pl011: Add reg-io-width parameters 

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.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@amd.com>
Link: https://lore.kernel.org/r/20220826120559.2122-3-shubhrajyoti.datta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shubhrajyoti Datta 2022-08-26 17:35:59 +05:30 committed by Greg Kroah-Hartman
parent 8ed030de05
commit 81db9e8edf
1 changed files with 16 additions and 0 deletions
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16
drivers/tty/serial/amba-pl011.c
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@ -2777,6 +2777,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
struct uart_amba_port *uap; struct uart_amba_port *uap;
struct vendor_data *vendor = id->data; struct vendor_data *vendor = id->data;
int portnr, ret; int portnr, ret;
u32 val;
portnr = pl011_find_free_port(); portnr = pl011_find_free_port();
if (portnr < 0) 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; uap->port.rs485_supported = pl011_rs485_supported;
snprintf(uap->type, sizeof(uap->type), "PL011 rev%u", amba_rev(dev)); 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); ret = pl011_setup_port(&dev->dev, uap, &dev->res, portnr);
if (ret) if (ret)
return ret; return ret;