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Date: Thu, 8 Sep 2022 09:00:10 -0700 From: Tim Harvey <tharvey@...eworks.com> To: Matti Vaittinen <mazziesaccount@...il.com>, Marek Vasut <marex@...x.de> Cc: linux-clk <linux-clk@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, Fabio Estevam <festevam@...il.com>, Shawn Guo <shawnguo@...nel.org>, NXP Linux Team <linux-imx@....com>, Stephen Boyd <sboyd@...nel.org>, Michael Turquette <mturquette@...libre.com> Subject: Re: BD71847 clk driver disables clk-32k-out causing RTC/WDT failure On Thu, Sep 1, 2022 at 9:14 PM Matti Vaittinen <mazziesaccount@...il.com> wrote: > > 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@denx.de/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 > Thanks Matti, Marek - has there been any progress on determining how best to keep certain clocks from being disabled? Best Regards, Tim
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