On 12/4/24 10:59, Francesco Dolcini wrote: > Hello Thomas, > thanks for the update. > > On Wed, Dec 04, 2024 at 10:08:43AM +0100, Thomas Richard wrote: >> On 11/19/24 20:01, Francesco Dolcini wrote: >>> Hello Thomas and TI folks, >>> >>> On Wed, Nov 13, 2024 at 11:43:05AM +0100, Thomas Richard wrote: >>>> Like on j7200, pinctrl contexts shall be saved and restored during >>>> suspend-to-ram. >>>> >>>> So use ti,j7200-padconf compatible. >>>> >>>> Signed-off-by: Thomas Richard <thomas.richard@xxxxxxxxxxx> >>>> --- >>>> Use ti,j7200-padconf compatible to save and restore pinctrl contexts during >>>> suspend-to-ram. >>>> --- >>>> arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi | 6 +++--- >>>> arch/arm64/boot/dts/ti/k3-j784s4-mcu-wakeup.dtsi | 12 ++++++------ >>> >>> Do j784s4 supports any kind of low power mode and/or suspend to ram? My >>> understanding was that this was not supported, but maybe there is some >>> details that was lost when I was told this information. >> >> We are working on suspend-to-ram support for j7200 and j784s4. >> During suspend-to-ram the SoC is fully powered-off (thanks to the PMIC >> which powers off all the power rails except the DDR which is in >> self-refresh), like on j7200. >> Please let me know if you want more details. > > ok, that's quite different from the common suspend-to-ram we use to have > implemented on other SoC. You would have some boot firmware (likely U-Boot) > code executing during resume, taking some different code path, in a similar way > to what it is being done for the partial-io support on am62p. It's going to be > more similar to hibernation from some point of view. If you want more details you can have a look to this presentation [1] (from my colleague Gregory CLEMENT). [1] https://www.youtube.com/watch?v=sN4krurp8bM > > Do you expect to have this feature nicely integrated within the standard > suspend/resume "framework" in Linux? Yes. Regards, Thomas
