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(parent: cd8843f) | patch
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)
commit8469636ab5d8c77645b953746c10fda6983a8830
treebb912f98a8108830ea93d2c7949a4ed1e7518194tree | snapshot
parentcd8843f541cc0ef057e27f1afba46374bbb84219commit | diff
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 diff | blob | history
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