This is a note to let you know that I've just added the patch titled
arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct
to the 5.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-dts-imx8mm-kontron-make-sure-soc-and-dram-supply-voltages-are-correct.patch
and it can be found in the queue-5.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 82a4f329b133ad0de66bee12c0be5c67bb8aa188 Mon Sep 17 00:00:00 2001
From: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
Date: Fri, 15 Oct 2021 14:48:36 +0200
Subject: arm64: dts: imx8mm-kontron: Make sure SOC and DRAM supply voltages are correct
From: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
commit 82a4f329b133ad0de66bee12c0be5c67bb8aa188 upstream.
It looks like the voltages for the SOC and DRAM supply weren't properly
validated before. The datasheet and uboot-imx code tells us that VDD_SOC
should be 800 mV in suspend and 850 mV in run mode. VDD_DRAM should be
950 mV for DDR clock frequencies of up to 1.5 GHz.
Let's fix these values to make sure the voltages are within the required
range.
Fixes: 8668d8b2e67f ("arm64: dts: Add the Kontron i.MX8M Mini SoMs and baseboards")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>
Signed-off-by: Shawn Guo <shawnguo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-n801x-som.dtsi
@@ -91,10 +91,12 @@
reg_vdd_soc: BUCK1 {
regulator-name = "buck1";
regulator-min-microvolt = <800000>;
- regulator-max-microvolt = <900000>;
+ regulator-max-microvolt = <850000>;
regulator-boot-on;
regulator-always-on;
regulator-ramp-delay = <3125>;
+ nxp,dvs-run-voltage = <850000>;
+ nxp,dvs-standby-voltage = <800000>;
};
reg_vdd_arm: BUCK2 {
@@ -111,7 +113,7 @@
reg_vdd_dram: BUCK3 {
regulator-name = "buck3";
regulator-min-microvolt = <850000>;
- regulator-max-microvolt = <900000>;
+ regulator-max-microvolt = <950000>;
regulator-boot-on;
regulator-always-on;
};
Patches currently in stable-queue which might be from frieder.schrempf@xxxxxxxxxx are
queue-5.14/arm64-dts-imx8mm-kontron-fix-polarity-of-reg_rst_eth2.patch
queue-5.14/arm64-dts-imx8mm-kontron-fix-connection-type-for-vsc8531-rgmii-phy.patch
queue-5.14/arm64-dts-imx8mm-kontron-make-sure-soc-and-dram-supply-voltages-are-correct.patch
queue-5.14/arm64-dts-imx8mm-kontron-set-lower-limit-of-vdd_snvs-to-800-mv.patch
queue-5.14/arm64-dts-imx8mm-kontron-fix-can-spi-clock-frequency.patch
