[PATCH 0/6] arm64: dts: imx8mq-librem5: Various improvements for Librem 5

[PATCH 0/6] arm64: dts: imx8mq-librem5: Various improvements for Librem 5

[Sebastian Krzyszkowiak via B4 Relay]

These are various DTS patches collected over time in Purism's
downstream tree - fixing the vibrator's PWM, improving reliability
of SparkLAN WiFi card and I2C buses, enabling power-on on RTC alarm
and cleaning up an unneeded property.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
---
Sebastian Krzyszkowiak (6):
      arm64: dts: imx8mq-librem5: Enable I2C recovery
      arm64: dts: imx8mq-librem5: Set vibrator's PWM frequency to 20kHz
      arm64: dts: imx8mq-librem5: Enable SNVS RTC
      arm64: dts: imx8mq-librem5: Limit uSDHC2 frequency to 50MHz
      arm64: dts: imx8mq-librem5: Set cap-power-off-card for usdhc2
      arm64: dts: imx8mq-librem5: Don't set mic-cfg for wm8962

 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 67 ++++++++++++++++++-----
 1 file changed, 54 insertions(+), 13 deletions(-)
---
base-commit: 9ace4753a5202b02191d54e9fdf7f9e3d02b85eb
change-id: 20260105-l5-dtb-fixes-ca96eb9900c7

Best regards,
-- 
Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

[PATCH 1/6] arm64: dts: imx8mq-librem5: Enable I2C recovery

[Sebastian Krzyszkowiak via B4 Relay]

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

i2c-imx can perform bus recovery by temporarily switching I2C pins
into GPIO mode. To do so, it needs GPIO and pinctrl handles to be
provided in the device tree.

Suggested-by: Denis Sergeevich <galilley@gmail.com>
Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 48 +++++++++++++++++++++--
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index 9e0e2d7271ef..ce039bd701c2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -512,6 +512,13 @@ MX8MQ_IOMUXC_I2C1_SDA_I2C1_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c1_gpio: i2c1-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C1_SCL_GPIO5_IO14	0x26
+			MX8MQ_IOMUXC_I2C1_SDA_GPIO5_IO15	0x26
+		>;
+	};
+
 	pinctrl_i2c2: i2c2grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_I2C2_SCL_I2C2_SCL		0x40000026
@@ -519,6 +526,13 @@ MX8MQ_IOMUXC_I2C2_SDA_I2C2_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c2_gpio: i2c2-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C2_SCL_GPIO5_IO16	0x26
+			MX8MQ_IOMUXC_I2C2_SDA_GPIO5_IO17	0x26
+		>;
+	};
+
 	pinctrl_i2c3: i2c3grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_I2C3_SCL_I2C3_SCL		0x40000026
@@ -526,6 +540,13 @@ MX8MQ_IOMUXC_I2C3_SDA_I2C3_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c3_gpio: i2c3-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C3_SCL_GPIO5_IO18	0x26
+			MX8MQ_IOMUXC_I2C3_SDA_GPIO5_IO19	0x26
+		>;
+	};
+
 	pinctrl_i2c4: i2c4grp {
 		fsl,pins = <
 			MX8MQ_IOMUXC_I2C4_SCL_I2C4_SCL		0x40000026
@@ -533,6 +554,13 @@ MX8MQ_IOMUXC_I2C4_SDA_I2C4_SDA		0x40000026
 		>;
 	};
 
+	pinctrl_i2c4_gpio: i2c4-gpiogrp {
+		fsl,pins = <
+			MX8MQ_IOMUXC_I2C4_SCL_GPIO5_IO20	0x26
+			MX8MQ_IOMUXC_I2C4_SDA_GPIO5_IO21	0x26
+		>;
+	};
+
 	pinctrl_keys: keysgrp {
 		fsl,pins = <
 			/* VOL- */
@@ -782,8 +810,11 @@ MX8MQ_IOMUXC_GPIO1_IO02_WDOG1_WDOG_B	0x1f
 
 &i2c1 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c1>;
+	pinctrl-1 = <&pinctrl_i2c1_gpio>;
+	scl-gpios = <&gpio5 14 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 15 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	typec_pd: usb-pd@3f {
@@ -982,8 +1013,11 @@ rtc@68 {
 
 &i2c2 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c2>;
+	pinctrl-1 = <&pinctrl_i2c2_gpio>;
+	scl-gpios = <&gpio5 16 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 17 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	magnetometer: magnetometer@1e	{
@@ -1031,8 +1065,11 @@ accel_gyro: accel-gyro@6a	{
 
 &i2c3 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c3>;
+	pinctrl-1 = <&pinctrl_i2c3_gpio>;
+	scl-gpios = <&gpio5 18 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 19 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	codec: audio-codec@1a {
@@ -1121,8 +1158,11 @@ touchscreen@38 {
 
 &i2c4 {
 	clock-frequency = <384000>;
-	pinctrl-names = "default";
+	pinctrl-names = "default", "gpio";
 	pinctrl-0 = <&pinctrl_i2c4>;
+	pinctrl-1 = <&pinctrl_i2c4_gpio>;
+	scl-gpios = <&gpio5 20 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+	sda-gpios = <&gpio5 21 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
 	status = "okay";
 
 	vcm@c {

-- 
2.52.0

Re: [PATCH 1/6] arm64: dts: imx8mq-librem5: Enable I2C recovery

[Peng Fan]

On Mon, Jan 05, 2026 at 09:39:38PM +0100, Sebastian Krzyszkowiak via B4 Relay wrote:
>From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
>
>i2c-imx can perform bus recovery by temporarily switching I2C pins
>into GPIO mode. To do so, it needs GPIO and pinctrl handles to be
>provided in the device tree.
>
>Suggested-by: Denis Sergeevich <galilley@gmail.com>
>Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

Reviewed-by: Peng Fan <peng.fan@nxp.com>

[PATCH 2/6] arm64: dts: imx8mq-librem5: Set vibrator's PWM frequency to 20kHz

[Sebastian Krzyszkowiak via B4 Relay]

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

1Hz as used previously was way too long.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index ce039bd701c2..b92b5f7b2bd7 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -287,7 +287,7 @@ bm818_codec: sound-wwan-codec {
 
 	vibrator {
 		compatible = "pwm-vibrator";
-		pwms = <&pwm1 0 1000000000 0>;
+		pwms = <&pwm1 0 50000 0>;
 		pwm-names = "enable";
 		vcc-supply = <&reg_vdd_3v3>;
 	};

-- 
2.52.0

Re: [PATCH 2/6] arm64: dts: imx8mq-librem5: Set vibrator's PWM frequency to 20kHz

[Peng Fan]

On Mon, Jan 05, 2026 at 09:39:39PM +0100, Sebastian Krzyszkowiak via B4 Relay wrote:
>From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
>
>1Hz as used previously was way too long.
>
>Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

Reviewed-by: Peng Fan <peng.fan@nxp.com>

[PATCH 3/6] arm64: dts: imx8mq-librem5: Enable SNVS RTC

[Sebastian Krzyszkowiak via B4 Relay]

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

It has been disabled because it was being used for system clock instead
of the discrete RTC. However, SNVS has some features that the discrete
RTC does not, such as being able to turn the device on. Solve that issue
with aliases instead and reenable SNVS RTC.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index b92b5f7b2bd7..8c37b1293699 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -17,6 +17,11 @@ / {
 	compatible = "purism,librem5", "fsl,imx8mq";
 	chassis-type = "handset";
 
+	aliases {
+		rtc0 = &rtc;
+		rtc1 = &snvs_rtc;
+	};
+
 	backlight_dsi: backlight-dsi {
 		compatible = "led-backlight";
 		leds = <&led_backlight>;
@@ -1001,7 +1006,7 @@ ldo7_reg: LDO7 {
 		};
 	};
 
-	rtc@68 {
+	rtc: rtc@68 {
 		compatible = "microcrystal,rv4162";
 		reg = <0x68>;
 		pinctrl-names = "default";
@@ -1316,10 +1321,6 @@ &snvs_pwrkey {
 	status = "okay";
 };
 
-&snvs_rtc {
-	status = "disabled";
-};
-
 &uart1 { /* console */
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_uart1>;

-- 
2.52.0

Re: [PATCH 3/6] arm64: dts: imx8mq-librem5: Enable SNVS RTC

[Peng Fan]

On Mon, Jan 05, 2026 at 09:39:40PM +0100, Sebastian Krzyszkowiak via B4 Relay wrote:
>From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
>
>It has been disabled because it was being used for system clock instead
>of the discrete RTC. However, SNVS has some features that the discrete
>RTC does not, such as being able to turn the device on. Solve that issue
>with aliases instead and reenable SNVS RTC.
>
>Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

Reviewed-by: Peng Fan <peng.fan@nxp.com>

[PATCH 4/6] arm64: dts: imx8mq-librem5: Limit uSDHC2 frequency to 50MHz

[Sebastian Krzyszkowiak via B4 Relay]

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

SparkLAN card has stability issues at 100MHz. It still appears to be
able to max out its throughput this way, so limit the frequency to
ensure stable operation.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index 8c37b1293699..0e3c103dd7ff 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -1424,7 +1424,7 @@ &usdhc1 {
 
 &usdhc2 {
 	assigned-clocks = <&clk IMX8MQ_CLK_USDHC2>;
-	assigned-clock-rates = <200000000>;
+	assigned-clock-rates = <50000000>;
 	pinctrl-names = "default", "state_100mhz", "state_200mhz";
 	pinctrl-0 = <&pinctrl_usdhc2>;
 	pinctrl-1 = <&pinctrl_usdhc2_100mhz>;
@@ -1434,7 +1434,7 @@ &usdhc2 {
 	mmc-pwrseq = <&usdhc2_pwrseq>;
 	post-power-on-delay-ms = <20>;
 	cd-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>;
-	max-frequency = <100000000>;
+	max-frequency = <50000000>;
 	disable-wp;
 	cap-sdio-irq;
 	keep-power-in-suspend;

-- 
2.52.0

Re: [PATCH 4/6] arm64: dts: imx8mq-librem5: Limit uSDHC2 frequency to 50MHz

[Peng Fan]

On Mon, Jan 05, 2026 at 09:39:41PM +0100, Sebastian Krzyszkowiak via B4 Relay wrote:
>From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
>
>SparkLAN card has stability issues at 100MHz. It still appears to be
>able to max out its throughput this way, so limit the frequency to
>ensure stable operation.
>
>Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

Reviewed-by: Peng Fan <peng.fan@nxp.com>

[PATCH 5/6] arm64: dts: imx8mq-librem5: Set cap-power-off-card for usdhc2

[Sebastian Krzyszkowiak via B4 Relay]

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

This is needed for brcmfmac to turn the card off in suspend
since 8c3170628a9ce24a59647bd24f897e666af919b8.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index 0e3c103dd7ff..22b1a29ad440 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -1437,6 +1437,7 @@ &usdhc2 {
 	max-frequency = <50000000>;
 	disable-wp;
 	cap-sdio-irq;
+	cap-power-off-card;
 	keep-power-in-suspend;
 	wakeup-source;
 	status = "okay";

-- 
2.52.0

Re: [PATCH 5/6] arm64: dts: imx8mq-librem5: Set cap-power-off-card for usdhc2

[Peng Fan]

On Mon, Jan 05, 2026 at 09:39:42PM +0100, Sebastian Krzyszkowiak via B4 Relay wrote:
>From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
>
>This is needed for brcmfmac to turn the card off in suspend
>since 8c3170628a9ce24a59647bd24f897e666af919b8.

Better use imperative sentence. Otherwise:

Reviewed-by: Peng Fan <peng.fan@nxp.com>

[PATCH 6/6] arm64: dts: imx8mq-librem5: Don't set mic-cfg for wm8962

[Sebastian Krzyszkowiak via B4 Relay]

From: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>

The default values are fine, and MICDET_ENA is handled by the driver on
its own anyway.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
---
 arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index 22b1a29ad440..b6f7daebadf2 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -1085,7 +1085,6 @@ codec: audio-codec@1a {
 		assigned-clock-parents = <&clk IMX8MQ_AUDIO_PLL1_OUT>;
 		assigned-clock-rates = <24576000>;
 		#sound-dai-cells = <0>;
-		mic-cfg = <0x200>;
 		DCVDD-supply = <&reg_aud_1v8>;
 		DBVDD-supply = <&reg_aud_1v8>;
 		AVDD-supply = <&reg_aud_1v8>;

-- 
2.52.0

Re: [PATCH 0/6] arm64: dts: imx8mq-librem5: Various improvements for Librem 5

[Shawn Guo]

On Mon, Jan 05, 2026 at 09:39:37PM +0100, Sebastian Krzyszkowiak via B4 Relay wrote:
> Sebastian Krzyszkowiak (6):
>       arm64: dts: imx8mq-librem5: Enable I2C recovery
>       arm64: dts: imx8mq-librem5: Set vibrator's PWM frequency to 20kHz
>       arm64: dts: imx8mq-librem5: Enable SNVS RTC
>       arm64: dts: imx8mq-librem5: Limit uSDHC2 frequency to 50MHz
>       arm64: dts: imx8mq-librem5: Set cap-power-off-card for usdhc2
>       arm64: dts: imx8mq-librem5: Don't set mic-cfg for wm8962

Applied all, thanks!