Update main clk documentation to match main clk implementation rework.
Signed-off-by: Boris BREZILLON <b.brezillon.dev@xxxxxxxxx>
---
.../devicetree/bindings/clock/at91-clock.txt | 56 ++++++++++++++++----
1 file changed, 47 insertions(+), 9 deletions(-)
diff --git a/Documentation/devicetree/bindings/clock/at91-clock.txt b/Documentation/devicetree/bindings/clock/at91-clock.txt
index cd5e239..9a7025b 100644
--- a/Documentation/devicetree/bindings/clock/at91-clock.txt
+++ b/Documentation/devicetree/bindings/clock/at91-clock.txt
@@ -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 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 internal RC 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:
--
1.7.9.5
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