On 06/24/13 14:18, NISHIMOTO Hiroki wrote:
This patch adds device tree support for serial_ns16550 driver.
Tested with pcduino (allwinner a10).
Signed-off-by: NISHIMOTO Hiroki <hiroki.nishimoto.if@xxxxxxxxx>
---
.../devicetree/bindings/serial/ns16550_serial.txt | 34 ++++++++++++++
drivers/serial/serial_ns16550.c | 53 ++++++++++++++++++++--
2 files changed, 84 insertions(+), 3 deletions(-)
create mode 100644 Documentation/devicetree/bindings/serial/ns16550_serial.txt
diff --git a/Documentation/devicetree/bindings/serial/ns16550_serial.txt b/Documentation/devicetree/bindings/serial/ns16550_serial.txt
new file mode 100644
index 0000000..848f949
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/ns16550_serial.txt
@@ -0,0 +1,34 @@
+* NS16550 UART
+
+Required properties:
+- compatible : "ns16550_serial"
Hiroki,
as stated in Documentation/devicetree/bindings/README, barebox uses the
same bindings as "the kernel" which is Linux I guess. Linux already has
a binding for ns16550 compatible serial.
I suggest to use that binding as a reference although it is not
documented but needs to be stripped from its source code.
+- reg : offset and length of the register set for the device.
+
+
+Optional properties:
+- clock-frequency : the input clock frequency for the UART.
+- reg-shift : quantity to shift the register offsets by. If this property is
+ not present then the register offsets are not shifted.
+- reg-io-width : the size (in bytes) of the IO accesses that should be
+ performed on the device. If this property is not present then single byte
+ accesses are used.
+- disable-fifo :
+ 0: enable tx/rx fifo (default value)
+ 1: disable tx/rx fifo
+- console-stdin : activate stdin on this console.
+- console-stdout : activate stdout on this console.
+- console-stderr : activate stderr on this console.
ePAPR specification already defines stdout-path and stdin-path.
Moreover, barebox has of_device_is_stdout_path to check if a device is
referenced by stdout-path property.
Sebastian
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