On Tue, Sep 14, 2021 at 5:41 AM Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Wed, Aug 25, 2021 at 02:47:21PM +0200, Geert Uytterhoeven wrote: > > CC Wolfram > > > > On Wed, Aug 25, 2021 at 2:28 PM Adam Ford <aford173@xxxxxxxxx> wrote: > > > The desired i2c2 speed is 400KHz, but when measured on a scope, it > > > is incorrect. The driver can use the i2c-scl-rising-time-ns to help > > > calculate the proper setting to get exactly 400KHz. > > The question for me is: Has it been measured that SCL rising time is > really 50ns or has it been measured that the bus clock is now exactly > 400kHz? The person who originally reported this to me moved on, so I don't know if he measured both the rise time or just the clock speed. I know originally, the clock speed was measured to be 426KHz instead of 400KHz, and with the change to the rise time, the measured clock speed was exactly 400KHz. I do not know if the measured rise time is really 50ns or not. adam >
