Hello Jonathan, Thank you for your answer that led me to the explanation. On Mon, Mar 08, 2021 at 05:24:27PM +0000, Jonathan Cameron wrote: > > That's odd because you should get a stub regulator... For simple cases > where the regulator is always on, there is no need to specify a regulator, > you can just rely on the regulator framework giving you one that basically > does nothing. > > Could you have a look at why you aren't getting a dummy_regulator from the code > just below here? > > https://elixir.bootlin.com/linux/latest/source/drivers/regulator/core.c#L1948 > I use a kernel provided by nvidia that is called tegra-l4t-r32.3.1, but is based on v4.9. Although the patch that provides automatically stub regulators 4ddfebd3b "regulator: core: Provide a dummy regulator with full constraints" is older than v3.13, I have found in the commits of my kernel on top of v4.9, this one commit 7f25dfa01aafe3d3ac1983a0d0f895775a80c005 Author: Laxman Dewangan <ldewangan@xxxxxxxxxx> Date: Tue Aug 11 18:28:53 2015 +0530 regulator: core: do not allow dummy regulator if config not selected Do not allow dummy regulator if DUMMY REGULATOR not selected from config. Bug 200223300 Change-Id: I672fb4f9d70f05bf3044b63c904be54e19c8ab36 Signed-off-by: Laxman Dewangan <ldewangan@xxxxxxxxxx> Reviewed-on: http://git-master/r/781784 (cherry picked from commit 4e11e2b997d315587956e8537064277c5687bf70) Reviewed-on: http://git-master/r/1195179 Signed-off-by: Venkat Reddy Talla <vreddytalla@xxxxxxxxxx> Reviewed-on: https://git-master.nvidia.com/r/1550248 Tested-by: Ujwal Patel <ujwalp@xxxxxxxxxx> Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@xxxxxxxxxx> Reviewed-by: svccoveritychecker <svccoveritychecker@xxxxxxxxxx> Reviewed-by: Shardar Mohammed <smohammed@xxxxxxxxxx> Tested-by: Shardar Mohammed <smohammed@xxxxxxxxxx> GVS: Gerrit_Virtual_Submit And CONFIG_REGULATOR_DUMMY is disabled in the default kernel configuration provided by nvidia :( Philippe
