On Thu, Nov 06, 2014 at 12:52:06PM +0100, Geert Uytterhoeven wrote: > On sh73a0/kzm9g-legacy, probing of the i2c masters fails with: > > i2c-sh_mobile i2c-sh_mobile.0: timing values out of range: L/H=0x208/0x1bf > sh_mobile: probe of i2c-sh_mobile.0 failed with error -22 Yay, so the warning I added found another bug \o/ > > According to the datasheet, the transfer rate is derived from the HP > clock (which runs at 104 MHz) divided by two. Hence > i2c_sh_mobile_platform_data.clks_per_count should be set to two. > > Now probing succeeds, and i2c works: > > i2c-sh_mobile i2c-sh_mobile.0: I2C adapter 0 with bus speed 100000 Hz (L/H=0x104/0xe0) > > Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx> > --- > Note that the L/H values still differ from the Transfer Rate Settings > example in Table 19.3 of the datasheet, which suggests 0x121/0xe7. Is the formula different or is it rounding errors? Thanks, Wolfram
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