The Siemens IOT2040 comes with a RS485 interface that allows to enable or disable bus termination via software. Add a bit to the flags field of serial_rs485 that applications can set in order to request this feature from the hardware. This seems generic enough to add it for everyone. Existing driver will simply ignore it when set.
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| @@ -122,6 +122,9 @@ struct serial_rs485 { · 121 unmodified lines | |||
| 122 | #define SER_RS485_RTS_AFTER_SEND (1 << 2) /* Logical level for | 122 | #define SER_RS485_RTS_AFTER_SEND (1 << 2) /* Logical level for |
| 123 | RTS pin after sent*/ | 123 | RTS pin after sent*/ |
| 124 | #define SER_RS485_RX_DURING_TX (1 << 4) | 124 | #define SER_RS485_RX_DURING_TX (1 << 4) |
| 125 | #define SER_RS485_TERMINATE_BUS (1 << 5) /* Enable bus | ||
| 126 | termination | ||
| 127 | (if supported) */ | ||
| 125 | __u32 delay_rts_before_send; /* Delay before send (milliseconds) */ | 128 | __u32 delay_rts_before_send; /* Delay before send (milliseconds) */ |
| 126 | __u32 delay_rts_after_send; /* Delay after send (milliseconds) */ | 129 | __u32 delay_rts_after_send; /* Delay after send (milliseconds) */ |
| 127 | __u32 padding[5]; /* Memory is cheap, new structs | 130 | __u32 padding[5]; /* Memory is cheap, new structs |