On 13/03/2016 at 00:39:34 +0900, Akinobu Mita wrote :

The reason is regmap_i2c_read() doesn't work for this device because the
STOP condition is required between set register address and read register
data.  (Fig 45. Bus protocol, reading from registers in PCF2127.pdf)

I'll update this patch by adding that comment.

That would be great. You also have a small typo in the subject line.
Apart from that, I'm ready to take the patches.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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