| Amlogic Meson MHU Mailbox Driver |
| ================================ |
| |
| The Amlogic's Meson SoCs Message-Handling-Unit (MHU) is a mailbox controller |
| that has 3 independent channels/links to communicate with remote processor(s). |
| MHU links are hardwired on a platform. A link raises interrupt for any |
| received data. However, there is no specified way of knowing if the sent |
| data has been read by the remote. This driver assumes the sender polls |
| STAT register and the remote clears it after having read the data. |
| |
| Mailbox Device Node: |
| ==================== |
| |
| Required properties: |
| -------------------- |
| - compatible: Shall be "amlogic,meson-gxbb-mhu" |
| - reg: Contains the mailbox register address range (base |
| address and length) |
| - #mbox-cells Shall be 1 - the index of the channel needed. |
| - interrupts: Contains the interrupt information corresponding to |
| each of the 2 links of MHU. |
| |
| Example: |
| -------- |
| |
| mailbox: mailbox@c883c404 { |
| #mbox-cells = <1>; |
| compatible = "amlogic,meson-gxbb-mhu"; |
| reg = <0 0xc883c404 0 0x4c>; |
| interrupts = <0 208 IRQ_TYPE_EDGE_RISING>, |
| <0 209 IRQ_TYPE_EDGE_RISING>, |
| <0 210 IRQ_TYPE_EDGE_RISING>; |
| #mbox-cells = <1>; |
| }; |
