i2c: sh_mobile: add new frequency calculation for later SoC

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The formula to generate the desired bus speeds has changed a little over
time. Implement the new formula and allow drivers to opt-in by changing
to this new config set. Ensure in probe that we don't divide by zero.
The returned values on a R-Car H2 (r8a7790/Lager board) match the
suggested values in the datasheet.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Wolfram Sang 2017-12-18 22:58:01 +01:00 • committed by Wolfram Sang

parent c3449f73a8

commit 4ecfb9d3b2

1 changed files with 18 additions and 1 deletions

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drivers/i2c/busses/i2c-sh_mobile.c

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