Required properties:
- compatible : shall be one of the following:
+ "atmel,at91sam9x5-sckc":
+ at91 SCKC (Slow Clock Controller)
+ This node contains the slow clock definitions.
+
+ "atmel,at91sam9x5-clk-slow-osc":
+ at91 slow oscillator
+
+ "atmel,at91sam9x5-clk-slow-rc-osc":
+ at91 internal slow RC oscillator
+
"atmel,at91rm9200-pmc" or
"atmel,at91sam9g45-pmc" or
"atmel,at91sam9n12-pmc" or
All at91 specific clocks (clocks defined below) must be child
node of the PMC node.
+ "atmel,at91sam9x5-clk-slow" (under sckc node)
+ or
+ "atmel,at91sam9260-clk-slow" (under pmc node):
+ at91 slow clk
+
+ "atmel,at91rm9200-clk-main-osc"
+ "atmel,at91sam9x5-clk-main-rc-osc"
+ at91 main clk sources
+
+ "atmel,at91sam9x5-clk-main"
"atmel,at91rm9200-clk-main":
- at91 main oscillator
+ at91 main clock
"atmel,at91rm9200-clk-master" or
"atmel,at91sam9x5-clk-master":
"atmel,at91sam9x5-clk-utmi":
at91 utmi clock
+Required properties for SCKC node:
+- reg : defines the IO memory reserved for the SCKC.
+- #size-cells : shall be 0 (reg is used to encode clk id).
+- #address-cells : shall be 1 (reg is used to encode clk id).
+
+
+For example:
+ sckc: sckc@fffffe50 {
+ compatible = "atmel,sama5d3-pmc";
+ reg = <0xfffffe50 0x4>
+ #size-cells = <0>;
+ #address-cells = <1>;
+
+ /* put at91 slow clocks here */
+ };
+
+
+Required properties for internal slow RC oscillator:
+- #clock-cells : from common clock binding; shall be set to 0.
+- clock-frequency : define the internal RC oscillator frequency.
+
+Optional properties:
+- clock-accuracy : define the internal RC oscillator accuracy.
+
+For example:
+ slow_rc_osc: slow_rc_osc {
+ compatible = "atmel,at91sam9x5-clk-slow-rc-osc";
+ clock-frequency = <32768>;
+ clock-accuracy = <50000000>;
+ };
+
+Required properties for slow oscillator:
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : shall encode the main osc source clk sources (see atmel datasheet).
+
+Optional properties:
+- atmel,osc-bypass : boolean property. Set this when a clock signal is directly
+ provided on XIN.
+
+For example:
+ slow_osc: slow_osc {
+ compatible = "atmel,at91rm9200-clk-slow-osc";
+ #clock-cells = <0>;
+ clocks = <&slow_xtal>;
+ };
+
+Required properties for slow clock:
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : shall encode the slow clk sources (see atmel datasheet).
+
+For example:
+ clk32k: slck {
+ compatible = "atmel,at91sam9x5-clk-slow";
+ #clock-cells = <0>;
+ clocks = <&slow_rc_osc &slow_osc>;
+ };
+
Required properties for PMC node:
- reg : defines the IO memory reserved for the PMC.
- #size-cells : shall be 0 (reg is used to encode clk id).
- interrupt-controller : tell that the PMC is an interrupt controller.
- #interrupt-cells : must be set to 1. The first cell encodes the interrupt id,
and reflect the bit position in the PMC_ER/DR/SR registers.
- You can use the dt macros defined in dt-bindings/clk/at91.h.
+ You can use the dt macros defined in dt-bindings/clock/at91.h.
0 (AT91_PMC_MOSCS) -> main oscillator ready
1 (AT91_PMC_LOCKA) -> PLL A ready
2 (AT91_PMC_LOCKB) -> PLL B ready
/* put at91 clocks here */
};
+Required properties for main clock internal RC oscillator:
+- interrupt-parent : must reference the PMC node.
+- interrupts : shall be set to "<0>".
+- clock-frequency : define the internal RC oscillator frequency.
+
+Optional properties:
+- clock-accuracy : define the internal RC oscillator accuracy.
+
+For example:
+ main_rc_osc: main_rc_osc {
+ compatible = "atmel,at91sam9x5-clk-main-rc-osc";
+ interrupt-parent = <&pmc>;
+ interrupts = <0>;
+ clock-frequency = <12000000>;
+ clock-accuracy = <50000000>;
+ };
+
+Required properties for main clock oscillator:
+- interrupt-parent : must reference the PMC node.
+- interrupts : shall be set to "<0>".
+- #clock-cells : from common clock binding; shall be set to 0.
+- clocks : shall encode the main osc source clk sources (see atmel datasheet).
+
+Optional properties:
+- atmel,osc-bypass : boolean property. Specified if a clock signal is provided
+ on XIN.
+
+ clock signal is directly provided on XIN pin.
+
+For example:
+ main_osc: main_osc {
+ compatible = "atmel,at91rm9200-clk-main-osc";
+ interrupt-parent = <&pmc>;
+ interrupts = <0>;
+ #clock-cells = <0>;
+ clocks = <&main_xtal>;
+ };
+
Required properties for main clock:
- interrupt-parent : must reference the PMC node.
- interrupts : shall be set to "<0>".
- #clock-cells : from common clock binding; shall be set to 0.
-- clocks (optional if clock-frequency is provided) : shall be the slow clock
- phandle. This clock is used to calculate the main clock rate if
- "clock-frequency" is not provided.
-- clock-frequency : the main oscillator frequency.Prefer the use of
- "clock-frequency" over automatic clock rate calculation.
+- clocks : shall encode the main clk sources (see atmel datasheet).
For example:
main: mainck {
- compatible = "atmel,at91rm9200-clk-main";
+ compatible = "atmel,at91sam9x5-clk-main";
interrupt-parent = <&pmc>;
interrupts = <0>;
#clock-cells = <0>;
- clocks = <&ck32k>;
- clock-frequency = <18432000>;
+ clocks = <&main_rc_osc &main_osc>;
};
Required properties for master clock:
projects / deliverable / linux.git / blobdiff