Previously, Linux assigned gpiochip numbers sequentially depending on
when the chip driver was probed. As RP1 is on the end of a PCIe link, it
is probed later than the on-board chips (including expanders connected
over SPI/I2C). This meant that RP1's gpiochip assignment was at an
offset that could potentially change.
A downstream kernel patch now assigns fixed offsets for RP1 and the
onboard gpiochips. Query the device tree to get proper GPIO_CHIP index.
Change-Id: I759978d4b3021c815a7d9febb41961cd1d3d185c
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/8650
Reviewed-by: Jonathan Bell <jonathan@raspberrypi.com>
Tested-by: jenkins
5284a5f3ec