On Tue, 2023-10-24 at 13:11 -0500, Glenn Miles wrote: > Allow external devices to drive pca9552 input pins by adding > input GPIO's to the model. This allows a device to connect > its output GPIO's to the pca9552 input GPIO's. > > In order for an external device to set the state of a pca9552 > pin, the pin must first be configured for high impedance (LED > is off). If the pca9552 pin is configured to drive the pin low > (LED is on), then external input will be ignored. > > Here is a table describing the logical state of a pca9552 pin > given the state being driven by the pca9552 and an external device: > > PCA9552 > Configured > State > > | Hi-Z | Low | > ------+------+-----+ > External Hi-Z | Hi | Low | > Device ------+------+-----+ > State Low | Low | Low | > ------+------+-----+ > > Signed-off-by: Glenn Miles <mil...@linux.vnet.ibm.com>
Reviewed-by: Andrew Jeffery <and...@codeconstruct.com.au>
