No driver for HDQ bus / coulomb counter in new GTA02 battery

[laforge@…]

The new battery contains a coulomb counter for accurate charge state reading at
any given time. The digital interface is HDQ, connected to an open-drain GPIO
of the PCF50633 PMU. We need a bit-banging HDQ controller driver for the
PCF50633 and a device driver for the actual coulomb counter circuit.

[willie_chen@…]

I tried to implement HDQ protocol in device driver. When I controlled the GPIO3
on PMU, It need to be controlled by i2c. But responding time is too long to
implement HDQ protocol.

We will re-design hardware version GTA02A5. HDQ protocol is controlled by two
GPIOs. That will decrease response time while using i2c.

[andy@…]

Sounds like validation of the HDQ action effectively blocks release since it
involves a new hardware spin. Adding as blocker for BZ341/release.

[andy]

I solved this using FIQ / HDQ / BQ27000 driver structure months ago, closing as fixed.