[0/3] i2c: adv748x: add support for CSI-2 TXA to work in 1-, 2- and 4-lane mode

Message

Niklas Söderlund Sept. 18, 2018, 1:45 a.m. UTC

Hi,

This series allows the TXA CSI-2 transmitter of the adv748x to function 
in 1-, 2- and 4- lane mode. Currently the driver fixes the hardware in 
4-lane mode. The driver looks at the standard DT property 'data-lanes' 
to determine which mode it should operate in.

Patch 1/3 adds the DT parsing and storing of the number of lanes. Patch 
2/3 adds functionality for intercepting and injecting the requested 
number of lanes when writing the register for NUM_LANES for the TXA 
register 0x00. Lastly patch 3/3 fixes a type related to lane settings 
for TXB which is confusing (at lest to me) when reviewing the result of 
this series.

Patch 1/3 and 2/3 could be squashed together but as the method in 2/3 is 
less then obvious since it intercepts the long tables of register writes 
I thought splitting them could ease review.

The series is based on the latest media-tree master and is tested on 
Renesas M3-N in 1-, 2- and 4- lane mode.

Niklas Söderlund (3):
  i2c: adv748x: store number of CSI-2 lanes described in device tree
  i2c: adv748x: configure number of lanes used for TXA CSI-2 transmitter
  i2c: adv748x: fix typo in comment for TXB CSI-2 transmitter power down

 drivers/media/i2c/adv748x/adv748x-core.c | 89 +++++++++++++++++++++---
 drivers/media/i2c/adv748x/adv748x.h      |  1 +
 2 files changed, 81 insertions(+), 9 deletions(-)