From: addy ke <addy.ke@rock-chips.com>
Date: Mon, 8 Sep 2014 03:38:25 +0000 (+0800)
Subject: i2c: rk3x: fix divisor calculation for SCL frequency
X-Git-Tag: fixes-for-v3.18-merge-window~67^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4a7bd7a386dc6b0bb49cb47614e06e8295d495a;p=pandora-kernel.git

i2c: rk3x: fix divisor calculation for SCL frequency

I2C_CLKDIV register descripted in the previous version of
RK3x chip manual is incorrect. Plus 1 is required.

The correct formula:
- T(SCL_HIGH) = T(PCLK) * (CLKDIVH + 1) * 8
- T(SCL_LOW) = T(PCLK) * (CLKDIVL + 1) * 8
- (SCL Divsor) = 8 * ((CLKDIVL + 1) + (CLKDIVH + 1))
- SCL = PCLK / (CLK Divsor)

It will be updated to the latest version of chip manual.

Signed-off-by: Addy Ke <addy.ke@rock-chips.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
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