diff options
| author | Shubhrajyoti Datta <shubhrajyoti.datta@amd.com> | 2022-08-26 15:05:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-08-30 14:26:48 +0300 |
| commit | 81db9e8edf7a886af0e6985d2562003976322cdf (patch) | |
| tree | 4b672eba20a97be828febad21d48aaef53240798 /drivers | |
| parent | 8ed030de05b35ec48c24b5a26df79d05a6d244d2 (diff) | |
| download | linux-81db9e8edf7a886af0e6985d2562003976322cdf.tar.xz | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/amba-pl011.c | 16 |
1 files changed, 16 insertions, 0 deletions
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; |