On 5/28/21 11:57 PM, Sergey Shtylyov wrote:

[...]

quoted

Here are 2 patches against the 'i2c/for-current' branch of Wolfram's 'linux.git' repo.
The affected drivers call platform_get_irq() but override its result in case of error
which prevents the deferred probing from working.

[1/2] i2c: iop3xx: fix deferred probing
[2/2] i2c: synquacer: fix deferred probing

   Please hold on with this series; I'm gonna add another patch...

   Actually, I'm unsure about drivers/i2c/busses/i2c-pca-platform.c: normally it
uses polling iff the (considered optional) IRQ can't be set up (irq < 0 returned
from platform_get_irq_optional()) then polling mode is used. I have a patch to
propaate -EPROBE_DEFER upstream but I'm not sure what is better : sefer the probe
(and potentially falling permanently iff the kernel wouldn't able to finally set
up the IRQ or to start the I2C driver in the polling mode right away. Does these
doubts even make sense? :-)

MBR, Sergey