tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1i.MX CPUFreq-DT OPP bindings
2================================
3
4Certain i.MX SoCs support different OPPs depending on the "market segment" and
5"speed grading" value which are written in fuses. These bits are combined with
6the opp-supported-hw values for each OPP to check if the OPP is allowed.
7
8Required properties:
9--------------------
10
11For each opp entry in 'operating-points-v2' table:
12- opp-supported-hw: Two bitmaps indicating:
13 - Supported speed grade mask
14 - Supported market segment mask
15 0: Consumer
16 1: Extended Consumer
17 2: Industrial
18 3: Automotive
19
20Example:
21--------
22
23opp_table {
24 compatible = "operating-points-v2";
25 opp-1000000000 {
26 opp-hz = /bits/ 64 <1000000000>;
27 /* grade >= 0, consumer only */
28 opp-supported-hw = <0xf>, <0x3>;
29 };
30
31 opp-1300000000 {
32 opp-hz = /bits/ 64 <1300000000>;
33 opp-microvolt = <1000000>;
34 /* grade >= 1, all segments */
35 opp-supported-hw = <0xe>, <0x7>;
36 };
37}