On 2022-01-01 21:17, Bryan O'Donoghue wrote:
On 31/12/2021 21:18, Bjorn Andersson wrote:
Unfortunately I don't know how to determine the list of protected
GPIOs,
other than trial and error.
But once you have the list, you can use "gpio-reserved-ranges" (a
series
of offset, count pairs) in the TLMM DT node to mark off these gpios as
reserved.
Ah nice, worked first time.
gpio-reserved-ranges = <20 4>;
You want to protect only one GPIO right? I understand that it should be
just <20 1>. Isn't the case?
You are using a CP01-C4 variant(#define CPU_IPQ6005 453, machid
0x8030003). In this variant alone, GPIO20 is protected by TZ for some of
its operation since there is no PMIC. In other variants of IPQ6018, you
shouldn't be seeing this issue.
Well I guess its good to know there's no more esoteric explanation
than "trustzone made it explode" - it only seems to be the one GPIO
too, quite what use there is for TZ in this GPIO
PINGROUP(20, pwm20, atest_char2, _, _, _, _, _, _, _)
is anybody's guess.
Good enough for my purposes.
Thanks !
---
bod
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