Re: [PATCH v3 4/5] dt: bindings: i2c-mux-pca954x: Add documentation for i2c-mux-irq-mask-en

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 <redacted>
Signed-off-by: Phil Reid <redacted>
---
 Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt | 3 +++
 1 file changed, 3 insertions(+)

Acked-by: Rob Herring <robh@kernel.org>