diff options
Diffstat (limited to 'drivers/serial/of_serial.c')
| -rw-r--r-- | drivers/serial/of_serial.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/serial/of_serial.c b/drivers/serial/of_serial.c index c0e50a46105..25029c7570b 100644 --- a/drivers/serial/of_serial.c +++ b/drivers/serial/of_serial.c @@ -31,7 +31,8 @@ static int __devinit of_platform_serial_setup(struct of_device *ofdev, struct resource resource; struct device_node *np = ofdev->node; const unsigned int *clk, *spd; - int ret; + const u32 *prop; + int ret, prop_size; memset(port, 0, sizeof *port); spd = of_get_property(np, "current-speed", NULL); @@ -49,6 +50,17 @@ static int __devinit of_platform_serial_setup(struct of_device *ofdev, spin_lock_init(&port->lock); port->mapbase = resource.start; + + /* Check for shifted address mapping */ + prop = of_get_property(np, "reg-offset", &prop_size); + if (prop && (prop_size == sizeof(u32))) + port->mapbase += *prop; + + /* Check for registers offset within the devices address range */ + prop = of_get_property(np, "reg-shift", &prop_size); + if (prop && (prop_size == sizeof(u32))) + port->regshift = *prop; + port->irq = irq_of_parse_and_map(np, 0); port->iotype = UPIO_MEM; port->type = type; @@ -56,7 +68,9 @@ static int __devinit of_platform_serial_setup(struct of_device *ofdev, port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_FIXED_PORT; port->dev = &ofdev->dev; - port->custom_divisor = *clk / (16 * (*spd)); + /* If current-speed was set, then try not to change it. */ + if (spd) + port->custom_divisor = *clk / (16 * (*spd)); return 0; } |