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Subject: Re: [virtio-dev] Re: [PATCH v2] virtio-i2c: add the device specification
On 2020/10/31 21:58, Paolo Bonzini wrote:
Then how to distinguish the order of the two segments if they are in one request ?On 27/10/20 12:20, Michael S. Tsirkin wrote:The I2C doesn't support segments numbering and sorting. So if one creates a multi-segment transaction, then he/she should keep the segments in order. Thanks.Fine, but I see no flags to signal start/end of such a transaction.In theory there's no difference between one multi-segment transaction and many single-segment transactions _in a single-master scenario_. However, it is a plausible configuration to have multiple guests sharing an I2C host device as if they were multiple master. For this reason, I would prefer to have at least support for transactions with 1 write and 1 read segment to the same address (see my other message). Paolo
We don't know this is a write followed by a read or a read followed by a write in this case.
However, if the request is the representation of only one segment of an I2C transaction,
we can simply judge by the order of the requests in the virtqueue.Thanks
I didn't see any response so I updated a v4 to have following
simplest request for this moment.
struct virtio_i2c_req {
ÂÂÂ le16 addr;
ÂÂÂ le16 len;
ÂÂÂ u8 buf[];
ÂÂÂ u8 status;
};
Thanks.
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