[Bug 90075] [BYT LPSS backlight] Acer Aspire Switch 10 backlight control

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90075

--- Comment #6 from darlor at seznam.cz ---
Hi again,
After applying all four patches, I did some debugging via additional kernel
messages. I went backwards from message "Failed to own the pwm chip: pwm_lpss"
to function *pwm_get(struct device *dev, const char *con_id) in
drivers/pwm/core.c. 

After macro function "list_for_each_entry(p, &pwm_lookup_list, list) {.....}"
variable "best" is still set to zero and pwm_get jumps to label "out:" because 
pointer "chosen" is still NULL.

list_for_each_entry did not iterate at all - printk message (placed after
"match = 0;") did not occurred in dmesg.

Ill try to investigate further why &pwm_lookup_list is empty.

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