On Mon, Jan 09, 2017 at 05:02:55PM +0800, Phil Reid wrote: > Unfortunately some hardware device will assert their irq line immediately > on power on and provide no mechanism to mask the irq. As the i2c muxes > provide no method to mask irq line this provides a work around by keeping > the parent irq masked until enough device drivers have loaded to service > all pending interrupts. > > For example the the ltc1760 assert its SMBALERT irq immediately on power > on. With two ltc1760 attached to bus 0 & 1 on a pca954x mux when the first > device is registered irq are enabled and fire continuously as the second > device driver has not yet loaded. Setting this parameter to 0x3 while > delay the irq being enabled until both devices are ready. > > Acked-by: Peter Rosin <peda@xxxxxxxxxx> > Signed-off-by: Phil Reid <preid@xxxxxxxxxxxxxxxxx> > --- > Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt | 3 +++ > 1 file changed, 3 insertions(+) Acked-by: Rob Herring <robh@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
