mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 22:53:55 +08:00
b9cb2ba718
Compiling the DT file with W=1, DTC warns like follows: Warning (unit_address_vs_reg): Node /opp_table0/opp@1000000000 has a unit name, but no reg property Fix this by replacing '@' with '-' as the OPP nodes will never have a "reg" property. Reported-by: Krzysztof Kozlowski <krzk@kernel.org> Reported-by: Masahiro Yamada <yamada.masahiro@socionext.com> Suggested-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Rob Herring <robh@kernel.org> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
129 lines
3.3 KiB
Plaintext
129 lines
3.3 KiB
Plaintext
TI CPUFreq and OPP bindings
|
|
================================
|
|
|
|
Certain TI SoCs, like those in the am335x, am437x, am57xx, and dra7xx
|
|
families support different OPPs depending on the silicon variant in use.
|
|
The ti-cpufreq driver can use revision and an efuse value from the SoC to
|
|
provide the OPP framework with supported hardware information. This is
|
|
used to determine which OPPs from the operating-points-v2 table get enabled
|
|
when it is parsed by the OPP framework.
|
|
|
|
Required properties:
|
|
--------------------
|
|
In 'cpus' nodes:
|
|
- operating-points-v2: Phandle to the operating-points-v2 table to use.
|
|
|
|
In 'operating-points-v2' table:
|
|
- compatible: Should be
|
|
- 'operating-points-v2-ti-cpu' for am335x, am43xx, and dra7xx/am57xx SoCs
|
|
- syscon: A phandle pointing to a syscon node representing the control module
|
|
register space of the SoC.
|
|
|
|
Optional properties:
|
|
--------------------
|
|
For each opp entry in 'operating-points-v2' table:
|
|
- opp-supported-hw: Two bitfields indicating:
|
|
1. Which revision of the SoC the OPP is supported by
|
|
2. Which eFuse bits indicate this OPP is available
|
|
|
|
A bitwise AND is performed against these values and if any bit
|
|
matches, the OPP gets enabled.
|
|
|
|
Example:
|
|
--------
|
|
|
|
/* From arch/arm/boot/dts/am33xx.dtsi */
|
|
cpus {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
cpu@0 {
|
|
compatible = "arm,cortex-a8";
|
|
device_type = "cpu";
|
|
reg = <0>;
|
|
|
|
operating-points-v2 = <&cpu0_opp_table>;
|
|
|
|
clocks = <&dpll_mpu_ck>;
|
|
clock-names = "cpu";
|
|
|
|
clock-latency = <300000>; /* From omap-cpufreq driver */
|
|
};
|
|
};
|
|
|
|
/*
|
|
* cpu0 has different OPPs depending on SoC revision and some on revisions
|
|
* 0x2 and 0x4 have eFuse bits that indicate if they are available or not
|
|
*/
|
|
cpu0_opp_table: opp-table {
|
|
compatible = "operating-points-v2-ti-cpu";
|
|
syscon = <&scm_conf>;
|
|
|
|
/*
|
|
* The three following nodes are marked with opp-suspend
|
|
* because they can not be enabled simultaneously on a
|
|
* single SoC.
|
|
*/
|
|
opp50-300000000 {
|
|
opp-hz = /bits/ 64 <300000000>;
|
|
opp-microvolt = <950000 931000 969000>;
|
|
opp-supported-hw = <0x06 0x0010>;
|
|
opp-suspend;
|
|
};
|
|
|
|
opp100-275000000 {
|
|
opp-hz = /bits/ 64 <275000000>;
|
|
opp-microvolt = <1100000 1078000 1122000>;
|
|
opp-supported-hw = <0x01 0x00FF>;
|
|
opp-suspend;
|
|
};
|
|
|
|
opp100-300000000 {
|
|
opp-hz = /bits/ 64 <300000000>;
|
|
opp-microvolt = <1100000 1078000 1122000>;
|
|
opp-supported-hw = <0x06 0x0020>;
|
|
opp-suspend;
|
|
};
|
|
|
|
opp100-500000000 {
|
|
opp-hz = /bits/ 64 <500000000>;
|
|
opp-microvolt = <1100000 1078000 1122000>;
|
|
opp-supported-hw = <0x01 0xFFFF>;
|
|
};
|
|
|
|
opp100-600000000 {
|
|
opp-hz = /bits/ 64 <600000000>;
|
|
opp-microvolt = <1100000 1078000 1122000>;
|
|
opp-supported-hw = <0x06 0x0040>;
|
|
};
|
|
|
|
opp120-600000000 {
|
|
opp-hz = /bits/ 64 <600000000>;
|
|
opp-microvolt = <1200000 1176000 1224000>;
|
|
opp-supported-hw = <0x01 0xFFFF>;
|
|
};
|
|
|
|
opp120-720000000 {
|
|
opp-hz = /bits/ 64 <720000000>;
|
|
opp-microvolt = <1200000 1176000 1224000>;
|
|
opp-supported-hw = <0x06 0x0080>;
|
|
};
|
|
|
|
oppturbo-720000000 {
|
|
opp-hz = /bits/ 64 <720000000>;
|
|
opp-microvolt = <1260000 1234800 1285200>;
|
|
opp-supported-hw = <0x01 0xFFFF>;
|
|
};
|
|
|
|
oppturbo-800000000 {
|
|
opp-hz = /bits/ 64 <800000000>;
|
|
opp-microvolt = <1260000 1234800 1285200>;
|
|
opp-supported-hw = <0x06 0x0100>;
|
|
};
|
|
|
|
oppnitro-1000000000 {
|
|
opp-hz = /bits/ 64 <1000000000>;
|
|
opp-microvolt = <1325000 1298500 1351500>;
|
|
opp-supported-hw = <0x04 0x0200>;
|
|
};
|
|
};
|