Re: [PATCH v2 1/2] arm64: dts: qcom: eliza-evk: Add PCIe0 with M.2 E key connector
From: Manivannan Sadhasivam
Date: Thu Jul 09 2026 - 09:08:08 EST
On Wed, Jul 08, 2026 at 11:47:16AM +0530, Krishna Chaitanya Chundru wrote:
> The Eliza EVK board features an M.2 E key connector connected to PCIe0.
> Enable the PCIe0 root port and its QMP PHY with the necessary RPMH
> regulator supplies. The M.2 slot's 3.3V supply rail is GPIO-controlled
> via a TCA9538 I/O expander on I2C4.
>
> The M.2 E key slot hosts a WLAN card connected over PCIe and a Bluetooth
> device connected over UART. Model the connector using the
> pcie-m2-e-connector binding, wiring the PCIe root port and UART5 for
> the respective interfaces.
>
> Reviewed-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxxxxxxxx>
> Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@xxxxxxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
- Mani
> ---
> arch/arm64/boot/dts/qcom/eliza-evk.dtsi | 116 ++++++++++++++++++++++++++++++++
> arch/arm64/boot/dts/qcom/eliza.dtsi | 1 +
> 2 files changed, 117 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/eliza-evk.dtsi b/arch/arm64/boot/dts/qcom/eliza-evk.dtsi
> index e47b24f8b827..6d76715ccffb 100644
> --- a/arch/arm64/boot/dts/qcom/eliza-evk.dtsi
> +++ b/arch/arm64/boot/dts/qcom/eliza-evk.dtsi
> @@ -11,6 +11,92 @@ aliases {
> chosen {
> stdout-path = "serial0:115200n8";
> };
> +
> + vreg_pcie_m_3p3: regulator-3p3 {
> + compatible = "regulator-fixed";
> +
> + regulator-name = "vreg_3p3";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> +
> + gpio = <&gpio_expander1 6 GPIO_ACTIVE_HIGH>;
> + enable-active-high;
> + };
> +
> + connector-0 {
> + compatible = "pcie-m2-e-connector";
> + vpcie3v3-supply = <&vreg_pcie_m_3p3>;
> + w-disable1-gpios = <&tlmm 35 GPIO_ACTIVE_LOW>;
> + w-disable2-gpios = <&pm8550vs_g_gpios 4 GPIO_ACTIVE_HIGH>;
> +
> + pinctrl-0 = <&m2_w_disable1>, <&m2_w_disable2>;
> + pinctrl-names = "default";
> +
> + ports {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + m2_e_pcie_ep: endpoint@0 {
> + reg = <0>;
> + remote-endpoint = <&pcieport0_ep>;
> + };
> + };
> +
> + port@3 {
> + reg = <3>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + m2_e_uart_ep: endpoint@0 {
> + reg = <0>;
> + remote-endpoint = <&uart5_ep>;
> + };
> + };
> + };
> + };
> +};
> +
> +&i2c4 {
> + pinctrl-0 = <&qup_i2c4_data_clk>;
> + pinctrl-names = "default";
> +
> + clock-frequency = <400000>;
> +
> + status = "okay";
> +
> + gpio_expander1: gpio@3c {
> + compatible = "ti,tca9538";
> + #gpio-cells = <2>;
> + gpio-controller;
> + reg = <0x3c>;
> + };
> +};
> +
> +&pcie0 {
> + status = "okay";
> +};
> +
> +&pcie0_phy {
> + vdda-phy-supply = <&vreg_l1k>;
> + vdda-pll-supply = <&vreg_l3k>;
> +
> + status = "okay";
> +};
> +
> +&pcie0port0 {
> + wake-gpios = <&tlmm 114 GPIO_ACTIVE_LOW>;
> + reset-gpios = <&tlmm 78 GPIO_ACTIVE_LOW>;
> +
> + port {
> + pcieport0_ep: endpoint {
> + remote-endpoint = <&m2_e_pcie_ep>;
> + };
> + };
> };
>
> &uart13 {
> @@ -18,3 +104,33 @@ &uart13 {
>
> status = "okay";
> };
> +
> +&uart5 {
> + status = "okay";
> +
> + port {
> + uart5_ep: endpoint {
> + remote-endpoint = <&m2_e_uart_ep>;
> + };
> + };
> +};
> +
> +&pm8550vs_g_gpios {
> + m2_w_disable2: m2-w-disable2-state {
> + pins = "gpio4";
> + function = "normal";
> + input-disable;
> + output-enable;
> + bias-disable;
> + power-source = <2>;
> + };
> +};
> +
> +&tlmm {
> + m2_w_disable1: m2-w-disable1-state {
> + pins = "gpio35";
> + function = "gpio";
> + drive-strength = <2>;
> + bias-pull-up;
> + };
> +};
> diff --git a/arch/arm64/boot/dts/qcom/eliza.dtsi b/arch/arm64/boot/dts/qcom/eliza.dtsi
> index 7cfd242bc192..cce65e18f979 100644
> --- a/arch/arm64/boot/dts/qcom/eliza.dtsi
> +++ b/arch/arm64/boot/dts/qcom/eliza.dtsi
> @@ -1909,6 +1909,7 @@ opp-8000000-3 {
> };
>
> pcie0port0: pcie@0 {
> + compatible = "pciclass,0604";
> device_type = "pci";
> reg = <0x0 0x0 0x0 0x0 0x0>;
> bus-range = <0x01 0xff>;
>
> --
> 2.34.1
>
--
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