As expected, the Lenovo ix4 has an poor-man's GPIO expander (74x163) connected by (guess what) GPIO bitbang SPI. This causes driver probing to fail when the GPIO expander is probed before GPIO SPI driver. This patch set introduces deferred probing support into base/driver.c by moving drivers that request probe deferral to an extra device list that will be reprobed later. As -EPROBE_DEFER is an error in general, the rest of the patch set amends gpio and led parts to deal with this special case. The corresponding drivers and support for Lenovo ix4 will be added in a third patch set. Sebastian Hesselbarth (4): base: Introduce deferred probing gpio: Return -EPROBE_DEFER on gpio_get_num() OF: gpio: Silence error message on -EPROBE_DEFER led: gpio: Properly deal with deferred probing drivers/base/driver.c | 42 +++++++++++++++++++++++++++++++++++++++--- drivers/gpio/gpiolib.c | 5 ++++- drivers/led/led-gpio.c | 15 ++++++++++++++- drivers/of/of_gpio.c | 5 +++-- include/asm-generic/errno.h | 1 + 5 files changed, 61 insertions(+), 7 deletions(-) --- Cc: barebox@xxxxxxxxxxxxxxxxxxx -- 2.1.0 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
