Messages in this thread | | | Subject | Re: [PATCH 00/21] i2c: make use of i2c_8bit_addr_from_msg | From | Peter Rosin <> | Date | Mon, 14 May 2018 19:01:23 +0200 |
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On 2018-05-14 18:11, Joe Perches wrote: > On Mon, 2018-05-14 at 16:53 +0200, Peter Rosin wrote: >> Hi! >> >> The nice little inline i2c_8bit_addr_from_msg is not getting >> enough use. This series improves the situation and drops a >> bunch of lines in the process. > > Perhaps the inline should test for I2C_M_REV_DIR_ADDR > as there is at least one use like > > - addr = msg->addr << 1; > - if (flags & I2C_M_RD) > - addr |= 1; > + addr = i2c_8bit_addr_from_msg(msg); > if (flags & I2C_M_REV_DIR_ADDR) > addr ^= 1; > > which look odd
I say no, because the driver has to also indicate support with I2C_FUNC_PROTOCOL_MANGLING and I don't see a sane way to check that part of the contract. But what do I know. Seems orthogonal.
> Do any of these changes now no longer need > the temporary flags variable?
Right, I thought I had made any obvious further simplification made possible by these changes, but I overlooked that one. The flags variable is certainly over-engineered in i2c-algo-pcf.c and would be a good candidate for removal. But that's only patch 3/21.
I'll wait for a bit with an update, and Wolfram can adjust this on the way in if he feels like it.
Cheers, Peter
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