upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
2.6 KiB
76 lines
2.6 KiB
* Synopsys DesignWare ABP UART
|
|
|
|
Required properties:
|
|
- compatible : "snps,dw-apb-uart"
|
|
- reg : offset and length of the register set for the device.
|
|
- interrupts : should contain uart interrupt.
|
|
|
|
Clock handling:
|
|
The clock rate of the input clock needs to be supplied by one of
|
|
- clock-frequency : the input clock frequency for the UART.
|
|
- clocks : phandle to the input clock
|
|
|
|
The supplying peripheral clock can also be handled, needing a second property
|
|
- clock-names: tuple listing input clock names.
|
|
Required elements: "baudclk", "apb_pclk"
|
|
|
|
Optional properties:
|
|
- snps,uart-16550-compatible : reflects the value of UART_16550_COMPATIBLE
|
|
configuration parameter. Define this if your UART does not implement the busy
|
|
functionality.
|
|
- resets : phandle to the parent reset controller.
|
|
- 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.
|
|
- dcd-override : Override the DCD modem status signal. This signal will always
|
|
be reported as active instead of being obtained from the modem status
|
|
register. Define this if your serial port does not use this pin.
|
|
- dsr-override : Override the DTS modem status signal. This signal will always
|
|
be reported as active instead of being obtained from the modem status
|
|
register. Define this if your serial port does not use this pin.
|
|
- cts-override : Override the CTS modem status signal. This signal will always
|
|
be reported as active instead of being obtained from the modem status
|
|
register. Define this if your serial port does not use this pin.
|
|
- ri-override : Override the RI modem status signal. This signal will always be
|
|
reported as inactive instead of being obtained from the modem status register.
|
|
Define this if your serial port does not use this pin.
|
|
|
|
Example:
|
|
|
|
uart@80230000 {
|
|
compatible = "snps,dw-apb-uart";
|
|
reg = <0x80230000 0x100>;
|
|
clock-frequency = <3686400>;
|
|
interrupts = <10>;
|
|
reg-shift = <2>;
|
|
reg-io-width = <4>;
|
|
dcd-override;
|
|
dsr-override;
|
|
cts-override;
|
|
ri-override;
|
|
};
|
|
|
|
Example with one clock:
|
|
|
|
uart@80230000 {
|
|
compatible = "snps,dw-apb-uart";
|
|
reg = <0x80230000 0x100>;
|
|
clocks = <&baudclk>;
|
|
interrupts = <10>;
|
|
reg-shift = <2>;
|
|
reg-io-width = <4>;
|
|
};
|
|
|
|
Example with two clocks:
|
|
|
|
uart@80230000 {
|
|
compatible = "snps,dw-apb-uart";
|
|
reg = <0x80230000 0x100>;
|
|
clocks = <&baudclk>, <&apb_pclk>;
|
|
clock-names = "baudclk", "apb_pclk";
|
|
interrupts = <10>;
|
|
reg-shift = <2>;
|
|
reg-io-width = <4>;
|
|
};
|
|
|