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: 0de4ab81ab26 ("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 --- arch/arm/boot/dts/imx6q-yapp4-crux.dts | 4 ++++ arch/arm/boot/dts/imx6qp-yapp4-crux-plus.dts | 4 ++++ 2 files changed, 8 insertions(+)

diff --git a/arch/arm/boot/dts/imx6q-yapp4-crux.dts b/arch/arm/boot/dts/imx6q-yapp4-crux.dts index deb18c57cf18..22f647eb12e7 100644 --- a/arch/arm/boot/dts/imx6q-yapp4-crux.dts +++ b/arch/arm/boot/dts/imx6q-yapp4-crux.dts @@ -45,6 +45,10 @@ &oled_1309 { status = "okay"; };

+&reg_pu { + regulator-always-on; +}; + &reg_usb_h1_vbus { status = "okay"; }; diff --git a/arch/arm/boot/dts/imx6qp-yapp4-crux-plus.dts b/arch/arm/boot/dts/imx6qp-yapp4-crux-plus.dts index a450a77f920f..b580ce891f7e 100644 --- a/arch/arm/boot/dts/imx6qp-yapp4-crux-plus.dts +++ b/arch/arm/boot/dts/imx6qp-yapp4-crux-plus.dts @@ -45,6 +45,10 @@ &oled_1309 { status = "okay"; };

+&reg_pu { + regulator-always-on; +}; + &reg_usb_h1_vbus { status = "okay"; };