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of: document new emc-timings subnode in nvidia,tegra124-car

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The EMC clock needs some extra information for changing its rate.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Tomeu Vizoso 2015-03-12 15:47:56 +01:00 committed by Thierry Reding
parent 42c86547f4
commit e34812c5ba
1 changed files with 41 additions and 1 deletions
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42
Documentation/devicetree/bindings/clock/nvidia,tegra124-car.txt
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@ -21,10 +21,31 @@ Required properties :
In clock consumers, this cell represents the bit number in the CAR's
array of CLK_RST_CONTROLLER_RST_DEVICES_* registers.
The node should contain a "emc-timings" subnode for each supported RAM type (see
field RAM_CODE in register PMC_STRAPPING_OPT_A).
Required properties for "emc-timings" nodes :
- nvidia,ram-code : Should contain the value of RAM_CODE this timing set
is used for.
Each "emc-timings" node should contain a "timing" subnode for every supported
EMC clock rate.
Required properties for "timing" nodes :
- clock-frequency : Should contain the memory clock rate to which this timing
relates.
- nvidia,parent-clock-frequency : Should contain the rate at which the current
parent of the EMC clock should be running at this timing.
- clocks : Must contain an entry for each entry in clock-names.
See ../clocks/clock-bindings.txt for details.
- clock-names : Must include the following entries:
- emc-parent : the clock that should be the parent of the EMC clock at this
timing.
Example SoC include file:
/ {
tegra_car: clock {
tegra_car: clock@60006000 {
compatible = "nvidia,tegra124-car";
reg = <0x60006000 0x1000>;
#clock-cells = <1>;
@ -62,4 +83,23 @@ Example board file:
&tegra_car {
clocks = <&clk_32k> <&osc>;
};
clock@60006000 {
emc-timings-3 {
nvidia,ram-code = <3>;
timing-12750000 {
clock-frequency = <12750000>;
nvidia,parent-clock-frequency = <408000000>;
clocks = <&tegra_car TEGRA124_CLK_PLL_P>;
clock-names = "emc-parent";
};
timing-20400000 {
clock-frequency = <20400000>;
nvidia,parent-clock-frequency = <408000000>;
clocks = <&tegra_car TEGRA124_CLK_PLL_P>;
clock-names = "emc-parent";
};
};
};
};