i2c: rk3x: add i2c support for rk3399 soc

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- new method to caculate i2c timings for rk3399:
  There was an timing issue about "repeated start" time at the I2C
  controller of version0, controller appears to drop SDA at .875x (7/8)
  programmed clk high. On version 1 of the controller, the rule(.875x)
  isn't enough to meet tSU;STA
  requirements on 100k's Standard-mode. To resolve this issue,
  sda_update_config, start_setup_config and stop_setup_config for I2C
  timing information are added, new rules are designed to calculate
  the timing information at new v1.
- pclk and function clk are separated at rk3399

Signed-off-by: David Wu <david.wu@rock-chips.com>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
[wsa: fixed whitespace issue]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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David Wu 2016-05-16 22:05:03 +08:00 • committed by Wolfram Sang

parent 908dbd5391

commit 7e086c3fc2

1 changed files with 274 additions and 20 deletions

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drivers/i2c/busses/i2c-rk3x.c

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