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clk: at91: update main clk documentation

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Update main clk documentation to match main clk implementation rework.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
This commit is contained in:
Boris BREZILLON 2014-04-22 15:12:31 +02:00 committed by Nicolas Ferre
parent 27cb1c2083
commit f9e1716f91
1 changed files with 47 additions and 9 deletions
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56
Documentation/devicetree/bindings/clock/at91-clock.txt
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@ -15,8 +15,13 @@ Required properties:
All at91 specific clocks (clocks defined below) must be child
node of the PMC node.
"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":
@ -85,24 +90,57 @@ For example:
/* 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: