Re: [PATCH v2 3/5] arm64: dts: freescale: add Ka-Ro Electronics tx8m-1610 COM
From: Maud Spierings
Date: Tue Oct 28 2025 - 08:43:36 EST
On 10/28/25 13:15, Matti Vaittinen wrote:
Hi Maud,
Thanks for the upstreaming work! :)
On 22/10/2025 10:22, Maud Spierings via B4 Relay wrote:
From: Maud Spierings <maudspierings@xxxxxxxxxxxxxx>
The Ka-Ro Electronics tx8m-1610 is a COM based on the imx8mm SOC. It has
1 GB of ram and 4 GB of eMMC storage on board.
Add it to enable boards based on this module
Signed-off-by: Maud Spierings <maudspierings@xxxxxxxxxxxxxx>
---
.../arm64/boot/dts/freescale/imx8mm-tx8m-1610.dtsi | 439 +++++++++++ ++++++++++
1 file changed, 439 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-tx8m-1610.dtsi b/ arch/arm64/boot/dts/freescale/imx8mm-tx8m-1610.dtsi
new file mode 100644
index 0000000000000..46d3ad80942cc
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx8mm-tx8m-1610.dtsi
@@ -0,0 +1,439 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2021 Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx>
+ * 2025 Maud Spierings <maudspierings@xxxxxxxxxxxxxx>
+ */
+
+#include "imx8mm.dtsi"
+
// snip
+ pmic: pmic@4b {
+ compatible = "rohm,bd71847";
+ reg = <0x4b>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+ pinctrl-0 = <&pinctrl_pmic>;
+ pinctrl-names = "default";
+ rohm,reset-snvs-powered;
+
+ regulators {
+ reg_vdd_soc: BUCK1 {
+ regulator-always-on;
+ regulator-boot-on;
+ regulator-max-microvolt = <900000>;
+ regulator-min-microvolt = <780000>;
+ regulator-name = "buck1";
+ regulator-ramp-delay = <1250>;
+ };
+
+ reg_vdd_arm: BUCK2 {
+ regulator-always-on;
+ regulator-boot-on;
+ regulator-max-microvolt = <950000>;
+ regulator-min-microvolt = <805000>;
+ regulator-name = "buck2";
+ regulator-ramp-delay = <1250>;
+ rohm,dvs-run-voltage = <950000>;
+ rohm,dvs-idle-voltage = <810000>;
+ };
+
+ reg_vdd_dram: BUCK3 {
+ regulator-always-on;
+ regulator-boot-on;
+ regulator-max-microvolt = <900000>;
+ regulator-min-microvolt = <805000>;
+ regulator-name = "buck3";
+ };
+
+ reg_vdd_3v3: BUCK4 {
+ regulator-always-on;
+ regulator-boot-on;
+ regulator-max-microvolt = <3300000>;
+ regulator-min-microvolt = <3300000>;
+ regulator-name = "buck4";
+ };
+
+ reg_vdd_1v8: BUCK5 {
+ regulator-always-on;
+ regulator-boot-on;
+ regulator-max-microvolt = <1950000>;
+ regulator-min-microvolt = <1700000>;
+ regulator-name = "buck5";
+ };
+
+ BUCK6 {
+ regulator-always-on;
+ regulator-boot-on;
+ /*
+ * The default output voltage is 1.1V, bumped
+ * to 1.35V in HW by a 499R/2.2K voltage divider in the
+ * feedback path.
+ */
Could/Should this be described using the:
'rohm,feedback-pull-up-r1-ohms' and
'rohm,feedback-pull-up-r2-ohms'? If I understand the comment correctly, that might allow the driver to be able to use correctly scaled voltages.
https://elixir.bootlin.com/linux/v6.18-rc1/source/Documentation/ devicetree/bindings/regulator/rohm,bd71837-regulator.yaml#L108
Ah I didn't know those existed, should've checked the bindings in more detail, thanks for the hint!
I will have to investigate this carefully, since I don't have access to the actual design of the COM, so I don't know exactly what is there.
Kind regards,
Maud