On Tue, Jun 16, 2015 at 02:17:56PM -0500, Felipe Balbi wrote: > With this patch we try to be as close to 50% > duty cycle as possible. The reason for this > is that some devices present an erratic behavior > with certain duty cycles. > > One such example is TPS65218 PMIC which fails > to change voltages when running @ 400kHz and > duty cycle is lower than 34%. > > The idea of the patch is simple: > > calculate desired scl_period from requested scl > and use 50% for tLow and 50% for tHigh. > > tLow is calculated with a DIV_ROUND_UP() to make > sure it's slightly higher than tHigh and to make > sure that we end up within I2C specifications. > > Kudos to Nishanth Menon and Dave Gerlach for helping > debugging the TPS65218 problem found on AM437x SK. > > Signed-off-by: Felipe Balbi <balbi@xxxxxx> the patch is correct, but I sent the version written on top of v3.14, I'll resend correct version, sorry. -- balbi
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