]> git.baikalelectronics.ru Git - kernel.git/commit
i2c: uniphier: fix violation of tLOW requirement for Fast-mode
authorMasahiro Yamada <yamada.masahiro@socionext.com>
Thu, 6 Dec 2018 03:55:27 +0000 (12:55 +0900)
committerWolfram Sang <wsa@the-dreams.de>
Thu, 6 Dec 2018 22:14:59 +0000 (23:14 +0100)
commitff3c9b95d68de64b45f7c095685378826263b89b
treebb912f98a8108830ea93d2c7949a4ed1e7518194
parentaae1dfee8d368cd9670600801ace21e98e37bec3
i2c: uniphier: fix violation of tLOW requirement for Fast-mode

Currently, the clock duty is set as tLOW/tHIGH = 1/1. For Fast-mode,
tLOW is set to 1.25 us while the I2C spec requires tLOW >= 1.3 us.

tLOW/tHIGH = 5/4 would meet both Standard-mode and Fast-mode:
  Standard-mode: tLOW = 5.56 us, tHIGH = 4.44 us
  Fast-mode:     tLOW = 1.39 us, tHIGH = 1.11 us

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
drivers/i2c/busses/i2c-uniphier.c