linux-kernel - [PATCH] ARM: dts: imx6dl-yapp4: Do not allow PM to switch PU regulator off on Q/QP

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Date:   Tue,  4 Oct 2022 17:39:20 +0200
From:   Petr Benes <petr.benes@...ft.com>
To:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>
Cc:     Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Petr Benes <petr.benes@...ft.com>, petrben@...il.com,
        stable@...r.kernel.org,
        Michal Vokáč <michal.vokac@...ft.com>
Subject: [PATCH] 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: 0de4ab81ab26 ("ARM: dts: imx6dl-yapp4: Add Y Soft IOTA Crux/Crux+ board")
Cc: petrben@...il.com
Cc: stable@...r.kernel.org
Signed-off-by: Petr Benes <petr.benes@...ft.com>
Signed-off-by: Michal Vokáč <michal.vokac@...ft.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";
 };
-- 
2.25.1