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ARM: dts: imx6dl-yapp4: Do not allow PM to switch PU regulator off on Q/QP 

Fix our design flaw in supply voltage distribution on the Quad and QuadPlus
based boards.

The problem is that we supply the SoC cache (VDD_CACHE_CAP) from VDD_PU
instead of VDD_SOC. The VDD_PU internal regulator can be disabled by PM
if VPU or GPU is not used. If that happens the system freezes. To prevent
that configure the reg_pu regulator to be always on.

Fixes: 0de4ab81ab ("ARM: dts: imx6dl-yapp4: Add Y Soft IOTA Crux/Crux+ board")
Cc: petrben@gmail.com
Cc: stable@vger.kernel.org
Signed-off-by: Petr Benes <petr.benes@ysoft.com>
Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Petr Benes 2022-10-04 17:39:20 +02:00 committed by Shawn Guo
parent bb5ad73941
commit 5e67d47d0b
2 changed files with 8 additions and 0 deletions
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4
arch/arm/boot/dts/imx6q-yapp4-crux.dts
View File

@ -33,6 +33,10 @@
status = "okay";
};
&reg_pu {
regulator-always-on;
};
&reg_usb_h1_vbus {
status = "okay";
};

4
arch/arm/boot/dts/imx6qp-yapp4-crux-plus.dts
View File

@ -33,6 +33,10 @@
status = "okay";
};
&reg_pu {
regulator-always-on;
};
&reg_usb_h1_vbus {
status = "okay";
};