Hi Ivan, > The BCM2835 I2C blocks have a register to set the clock-stretch > timeout - how long the device is allowed to hold SCL low - in bus > cycles. The current driver doesn't write to the register, therefore > the default value of 64 cycles is being used for all devices. > > Set the timeout to the value recommended for SMBus - 35ms. By default, busses are I2C and not SMBus, so it looks like we should finally apply this patch which disables CLKT: http://patchwork.ozlabs.org/project/linux-i2c/patch/1519422151-6218-1-git-send-email-stefan.wahren@xxxxxxxx/ If you really want the SMBus timeout applied, you can check for a "smbus" property in DT and then set CLKT accordingly in a seperate patch. Kind regards, Wolfram
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