Re: BD71847 clk driver disables clk-32k-out causing RTC/WDT failure
From: Matti Vaittinen
Date: Fri Sep 02 2022 - 00:14:10 EST
Hi Tim,
On 9/2/22 01:23, Tim Harvey wrote:
Greetings,
I've found that the bd71847 clk driver (CONFIG_COMMON_CLK_BD718XX
drivers/clk/clk-bd718x7.c) disables clk-32k-out (the BD71847 C32K_OUT
pin) which is connected IMX8MM RTC_XTALI which ends up disabling the
IMX RTC as well as the IMX WDOG functionality.
//snip
This happens via clk_unprepare_unused() as nothing is flagging the
clk-32k-out as being used. What should be added to the device-tree to
signify that this clk is indeed necessary and should not be disabled?
I have seen following proposal from Marek Vasut:
https://lore.kernel.org/all/20220517235919.200375-1-marex@xxxxxxx/T/#m52d6d0831bf43d5f293e35cb27f3021f278d0564
I am not sure if the discussion is completed though. I guess it was
agreed this was needed/usefull and maybe the remaining thing to decide
was just the property naming.
Best Regards
-- Matti
--
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland
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