About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / devicetree / bindings / serial / snps-dw-apb-uart.txt




Custom Search

Based on kernel version 3.19. Page generated on 2015-02-13 21:19 EST.

1	* Synopsys DesignWare ABP UART
2	
3	Required properties:
4	- compatible : "snps,dw-apb-uart"
5	- reg : offset and length of the register set for the device.
6	- interrupts : should contain uart interrupt.
7	
8	Clock handling:
9	The clock rate of the input clock needs to be supplied by one of
10	- clock-frequency : the input clock frequency for the UART.
11	- clocks : phandle to the input clock
12	
13	The supplying peripheral clock can also be handled, needing a second property
14	- clock-names: tuple listing input clock names.
15		Required elements: "baudclk", "apb_pclk"
16	
17	Optional properties:
18	- resets : phandle to the parent reset controller.
19	- reg-shift : quantity to shift the register offsets by.  If this property is
20	  not present then the register offsets are not shifted.
21	- reg-io-width : the size (in bytes) of the IO accesses that should be
22	  performed on the device.  If this property is not present then single byte
23	  accesses are used.
24	
25	Example:
26	
27		uart@80230000 {
28			compatible = "snps,dw-apb-uart";
29			reg = <0x80230000 0x100>;
30			clock-frequency = <3686400>;
31			interrupts = <10>;
32			reg-shift = <2>;
33			reg-io-width = <4>;
34		};
35	
36	Example with one clock:
37	
38		uart@80230000 {
39			compatible = "snps,dw-apb-uart";
40			reg = <0x80230000 0x100>;
41			clocks = <&baudclk>;
42			interrupts = <10>;
43			reg-shift = <2>;
44			reg-io-width = <4>;
45		};
46	
47	Example with two clocks:
48	
49		uart@80230000 {
50			compatible = "snps,dw-apb-uart";
51			reg = <0x80230000 0x100>;
52			clocks = <&baudclk>, <&apb_pclk>;
53			clock-names = "baudclk", "apb_pclk";
54			interrupts = <10>;
55			reg-shift = <2>;
56			reg-io-width = <4>;
57		};
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.