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i2c: nomadik: auto-calculate slave setup time

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The Nomadik I2C controller needs to have the slave set-up time
configured based off the clock used to drive the I2C bus block.
Currently this is done with static assignments assuming that the
block is clocked 48MHz which is pretty likely to be bug-prone.
Calculate the SLSU from the equation given in the datasheet
instead.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Linus Walleij
2013-11-28 23:11:45 +01:00
committed by Wolfram Sang
parent 4868ca387d
commit 977303979d
2 changed files with 28 additions and 17 deletions
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5
include/linux/platform_data/i2c-nomadik.h
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@@ -18,10 +18,6 @@ enum i2c_freq_mode {
/**
* struct nmk_i2c_controller - client specific controller configuration
* @clk_freq: clock frequency for the operation mode
* @slsu: Slave data setup time in ns.
* The needed setup time for three modes of operation
* are 250ns, 100ns and 10ns respectively thus leading
* to the values of 14, 6, 2 for a 48 MHz i2c clk
* @tft: Tx FIFO Threshold in bytes
* @rft: Rx FIFO Threshold in bytes
* @timeout Slave response timeout(ms)
@@ -29,7 +25,6 @@ enum i2c_freq_mode {
*/
struct nmk_i2c_controller {
u32 clk_freq;
unsigned short slsu;
unsigned char tft;
unsigned char rft;
int timeout;