On 07/02/2018 01:24 PM, Wolfram Sang wrote:

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+	if (msg->flags & I2C_M_RD)
+		cmd |= I2C_CMD_READ;

Since you support MANGLING, I'd think you can easily support
I2C_M_REV_DIR_ADDR here, too?

Hm, I don't really understand the purpose of that flag. From the docs:

This toggles the Rd/Wr flag. That is, if you want to do a write, but
     need to emit an Rd instead of a Wr, or vice versa, you set this
     flag. For example:
S Addr Rd [A] Data [A] Data [A] ... [A] Data [A] P

I don't think our hardware supports this type of operation.

I'd think something like this should do:

	if (msg->flags & I2C_M_REV_DIR_ADDR)
		cmd ^= I2C_CMD_READ;

I meant that the hardware cannot interpret this, it would be a 
meaningless command unfortunately.