| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | Qualcomm Hardware Mutex Block: |
| 2 | |
| 3 | The hardware block provides mutexes utilized between different processors on |
| 4 | the SoC as part of the communication protocol used by these processors. |
| 5 | |
| 6 | - compatible: |
| 7 | Usage: required |
| 8 | Value type: <string> |
| 9 | Definition: must be one of: |
| 10 | "qcom,sfpb-mutex", |
| 11 | "qcom,tcsr-mutex" |
| 12 | |
| 13 | - syscon: |
| 14 | Usage: required |
| 15 | Value type: <prop-encoded-array> |
| 16 | Definition: one cell containing: |
| 17 | syscon phandle |
| 18 | offset of the hwmutex block within the syscon |
| 19 | stride of the hwmutex registers |
| 20 | |
| 21 | - #hwlock-cells: |
| 22 | Usage: required |
| 23 | Value type: <u32> |
| 24 | Definition: must be 1, the specified cell represent the lock id |
| 25 | (hwlock standard property, see hwlock.txt) |
| 26 | |
| 27 | Example: |
| 28 | |
| 29 | tcsr_mutex_block: syscon@fd484000 { |
| 30 | compatible = "syscon"; |
| 31 | reg = <0xfd484000 0x2000>; |
| 32 | }; |
| 33 | |
| 34 | hwlock@fd484000 { |
| 35 | compatible = "qcom,tcsr-mutex"; |
| 36 | syscon = <&tcsr_mutex_block 0 0x80>; |
| 37 | |
| 38 | #hwlock-cells = <1>; |
| 39 | }; |