diff options
-rw-r--r-- | Documentation/devicetree/bindings/tty/serial/of-serial.txt | 3 | ||||
-rw-r--r-- | drivers/tty/serial/of_serial.c | 17 |
2 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/tty/serial/of-serial.txt b/Documentation/devicetree/bindings/tty/serial/of-serial.txt index 35e53ae85ee..337a7e51fac 100644 --- a/Documentation/devicetree/bindings/tty/serial/of-serial.txt +++ b/Documentation/devicetree/bindings/tty/serial/of-serial.txt | |||
@@ -19,6 +19,9 @@ Optional properties: | |||
19 | - current-speed : the current active speed of the UART. | 19 | - current-speed : the current active speed of the UART. |
20 | - reg-offset : offset to apply to the mapbase from the start of the registers. | 20 | - reg-offset : offset to apply to the mapbase from the start of the registers. |
21 | - reg-shift : quantity to shift the register offsets by. | 21 | - reg-shift : quantity to shift the register offsets by. |
22 | - reg-io-width : the size (in bytes) of the IO accesses that should be | ||
23 | performed on the device. There are some systems that require 32-bit | ||
24 | accesses to the UART (e.g. TI davinci). | ||
22 | - used-by-rtas : set to indicate that the port is in use by the OpenFirmware | 25 | - used-by-rtas : set to indicate that the port is in use by the OpenFirmware |
23 | RTAS and should not be registered. | 26 | RTAS and should not be registered. |
24 | 27 | ||
diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c index c911b2419ab..36038ed8f09 100644 --- a/drivers/tty/serial/of_serial.c +++ b/drivers/tty/serial/of_serial.c | |||
@@ -65,6 +65,23 @@ static int __devinit of_platform_serial_setup(struct platform_device *ofdev, | |||
65 | 65 | ||
66 | port->irq = irq_of_parse_and_map(np, 0); | 66 | port->irq = irq_of_parse_and_map(np, 0); |
67 | port->iotype = UPIO_MEM; | 67 | port->iotype = UPIO_MEM; |
68 | prop = of_get_property(np, "reg-io-width", &prop_size); | ||
69 | if (prop && (prop_size == sizeof(u32))) { | ||
70 | switch (be32_to_cpup(prop)) { | ||
71 | case 1: | ||
72 | port->iotype = UPIO_MEM; | ||
73 | break; | ||
74 | case 4: | ||
75 | port->iotype = UPIO_MEM32; | ||
76 | break; | ||
77 | default: | ||
78 | dev_warn(&ofdev->dev, | ||
79 | "unsupported io width (%d bytes)\n", | ||
80 | be32_to_cpup(prop)); | ||
81 | return -EINVAL; | ||
82 | } | ||
83 | } | ||
84 | |||
68 | port->type = type; | 85 | port->type = type; |
69 | port->uartclk = be32_to_cpup(clk); | 86 | port->uartclk = be32_to_cpup(clk); |
70 | port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP | 87 | port->flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP |