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-rw-r--r--Documentation/devicetree/bindings/clock/at91-clock.txt128
1 files changed, 119 insertions, 9 deletions
diff --git a/Documentation/devicetree/bindings/clock/at91-clock.txt b/Documentation/devicetree/bindings/clock/at91-clock.txt
index 6794cdc96d8f..b3d544ca522a 100644
--- a/Documentation/devicetree/bindings/clock/at91-clock.txt
+++ b/Documentation/devicetree/bindings/clock/at91-clock.txt
@@ -6,6 +6,16 @@ This binding uses the common clock binding[1].
6 6
7Required properties: 7Required properties:
8- compatible : shall be one of the following: 8- compatible : shall be one of the following:
9 "atmel,at91sam9x5-sckc":
10 at91 SCKC (Slow Clock Controller)
11 This node contains the slow clock definitions.
12
13 "atmel,at91sam9x5-clk-slow-osc":
14 at91 slow oscillator
15
16 "atmel,at91sam9x5-clk-slow-rc-osc":
17 at91 internal slow RC oscillator
18
9 "atmel,at91rm9200-pmc" or 19 "atmel,at91rm9200-pmc" or
10 "atmel,at91sam9g45-pmc" or 20 "atmel,at91sam9g45-pmc" or
11 "atmel,at91sam9n12-pmc" or 21 "atmel,at91sam9n12-pmc" or
@@ -15,8 +25,18 @@ Required properties:
15 All at91 specific clocks (clocks defined below) must be child 25 All at91 specific clocks (clocks defined below) must be child
16 node of the PMC node. 26 node of the PMC node.
17 27
28 "atmel,at91sam9x5-clk-slow" (under sckc node)
29 or
30 "atmel,at91sam9260-clk-slow" (under pmc node):
31 at91 slow clk
32
33 "atmel,at91rm9200-clk-main-osc"
34 "atmel,at91sam9x5-clk-main-rc-osc"
35 at91 main clk sources
36
37 "atmel,at91sam9x5-clk-main"
18 "atmel,at91rm9200-clk-main": 38 "atmel,at91rm9200-clk-main":
19 at91 main oscillator 39 at91 main clock
20 40
21 "atmel,at91rm9200-clk-master" or 41 "atmel,at91rm9200-clk-master" or
22 "atmel,at91sam9x5-clk-master": 42 "atmel,at91sam9x5-clk-master":
@@ -54,6 +74,63 @@ Required properties:
54 "atmel,at91sam9x5-clk-utmi": 74 "atmel,at91sam9x5-clk-utmi":
55 at91 utmi clock 75 at91 utmi clock
56 76
77Required properties for SCKC node:
78- reg : defines the IO memory reserved for the SCKC.
79- #size-cells : shall be 0 (reg is used to encode clk id).
80- #address-cells : shall be 1 (reg is used to encode clk id).
81
82
83For example:
84 sckc: sckc@fffffe50 {
85 compatible = "atmel,sama5d3-pmc";
86 reg = <0xfffffe50 0x4>
87 #size-cells = <0>;
88 #address-cells = <1>;
89
90 /* put at91 slow clocks here */
91 };
92
93
94Required properties for internal slow RC oscillator:
95- #clock-cells : from common clock binding; shall be set to 0.
96- clock-frequency : define the internal RC oscillator frequency.
97
98Optional properties:
99- clock-accuracy : define the internal RC oscillator accuracy.
100
101For example:
102 slow_rc_osc: slow_rc_osc {
103 compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
104 clock-frequency = <32768>;
105 clock-accuracy = <50000000>;
106 };
107
108Required properties for slow oscillator:
109- #clock-cells : from common clock binding; shall be set to 0.
110- clocks : shall encode the main osc source clk sources (see atmel datasheet).
111
112Optional properties:
113- atmel,osc-bypass : boolean property. Set this when a clock signal is directly
114 provided on XIN.
115
116For example:
117 slow_osc: slow_osc {
118 compatible = "atmel,at91rm9200-clk-slow-osc";
119 #clock-cells = <0>;
120 clocks = <&slow_xtal>;
121 };
122
123Required properties for slow clock:
124- #clock-cells : from common clock binding; shall be set to 0.
125- clocks : shall encode the slow clk sources (see atmel datasheet).
126
127For example:
128 clk32k: slck {
129 compatible = "atmel,at91sam9x5-clk-slow";
130 #clock-cells = <0>;
131 clocks = <&slow_rc_osc &slow_osc>;
132 };
133
57Required properties for PMC node: 134Required properties for PMC node:
58- reg : defines the IO memory reserved for the PMC. 135- reg : defines the IO memory reserved for the PMC.
59- #size-cells : shall be 0 (reg is used to encode clk id). 136- #size-cells : shall be 0 (reg is used to encode clk id).
@@ -85,24 +162,57 @@ For example:
85 /* put at91 clocks here */ 162 /* put at91 clocks here */
86 }; 163 };
87 164
165Required properties for main clock internal RC oscillator:
166- interrupt-parent : must reference the PMC node.
167- interrupts : shall be set to "<0>".
168- clock-frequency : define the internal RC oscillator frequency.
169
170Optional properties:
171- clock-accuracy : define the internal RC oscillator accuracy.
172
173For example:
174 main_rc_osc: main_rc_osc {
175 compatible = "atmel,at91sam9x5-clk-main-rc-osc";
176 interrupt-parent = <&pmc>;
177 interrupts = <0>;
178 clock-frequency = <12000000>;
179 clock-accuracy = <50000000>;
180 };
181
182Required properties for main clock oscillator:
183- interrupt-parent : must reference the PMC node.
184- interrupts : shall be set to "<0>".
185- #clock-cells : from common clock binding; shall be set to 0.
186- clocks : shall encode the main osc source clk sources (see atmel datasheet).
187
188Optional properties:
189- atmel,osc-bypass : boolean property. Specified if a clock signal is provided
190 on XIN.
191
192 clock signal is directly provided on XIN pin.
193
194For example:
195 main_osc: main_osc {
196 compatible = "atmel,at91rm9200-clk-main-osc";
197 interrupt-parent = <&pmc>;
198 interrupts = <0>;
199 #clock-cells = <0>;
200 clocks = <&main_xtal>;
201 };
202
88Required properties for main clock: 203Required properties for main clock:
89- interrupt-parent : must reference the PMC node. 204- interrupt-parent : must reference the PMC node.
90- interrupts : shall be set to "<0>". 205- interrupts : shall be set to "<0>".
91- #clock-cells : from common clock binding; shall be set to 0. 206- #clock-cells : from common clock binding; shall be set to 0.
92- clocks (optional if clock-frequency is provided) : shall be the slow clock 207- clocks : shall encode the main clk sources (see atmel datasheet).
93 phandle. This clock is used to calculate the main clock rate if
94 "clock-frequency" is not provided.
95- clock-frequency : the main oscillator frequency.Prefer the use of
96 "clock-frequency" over automatic clock rate calculation.
97 208
98For example: 209For example:
99 main: mainck { 210 main: mainck {
100 compatible = "atmel,at91rm9200-clk-main"; 211 compatible = "atmel,at91sam9x5-clk-main";
101 interrupt-parent = <&pmc>; 212 interrupt-parent = <&pmc>;
102 interrupts = <0>; 213 interrupts = <0>;
103 #clock-cells = <0>; 214 #clock-cells = <0>;
104 clocks = <&ck32k>; 215 clocks = <&main_rc_osc &main_osc>;
105 clock-frequency = <18432000>;
106 }; 216 };
107 217
108Required properties for master clock: 218Required properties for master clock: