On 24.10.2019 11:51, Anson Huang wrote:
> On i.MX6UL 14x14 EVK board, sensors' power are controlled
> by GPIO5_IO02, add GPIO regulator for sensors to manage
> their power.
>
> Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
For me this breaks network boot on imx6ul evk, relevant log snippet is this:
fec 20b4000.ethernet eth0: Unable to connect to phy
IP-Config: Failed to open eth0
Looking at schematics (SPF-28616_C2.pdf) I see that SNVS_TAMPER2 pin is
connected to PERI_PWREN which controls VPERI_3V3 which is used across
the board:
* Sensors (VSENSOR_3V3)
* Ethernet (VENET_3V3)
* Bluetooth
* CAN
* Arduino header
* Camera
Maybe there are board revision differences? As far as I can tell this
regulator is not specific to sensors so it should be always on.
> ---
> arch/arm/boot/dts/imx6ul-14x14-evk.dtsi | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/arch/arm/boot/dts/imx6ul-14x14-evk.dtsi b/arch/arm/boot/dts/imx6ul-14x14-evk.dtsi
> index c2a9dd5..4074570 100644
> --- a/arch/arm/boot/dts/imx6ul-14x14-evk.dtsi
> +++ b/arch/arm/boot/dts/imx6ul-14x14-evk.dtsi
> @@ -30,6 +30,16 @@
> enable-active-high;
> };
>
> + reg_sensors: regulator-sensors {
> + compatible = "regulator-fixed";
> + pinctrl-names = "default";
> + pinctrl-0 = <&pinctrl_sensors_reg>;
> + regulator-name = "sensors-supply";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> + gpio = <&gpio5 2 GPIO_ACTIVE_LOW>;
> + };
> +
> reg_can_3v3: regulator-can-3v3 {
> compatible = "regulator-fixed";
> regulator-name = "can-3v3";
> @@ -448,6 +458,12 @@
> >;
> };
>
> + pinctrl_sensors_reg: sensorsreggrp {
> + fsl,pins = <
> + MX6UL_PAD_SNVS_TAMPER2__GPIO5_IO02 0x1b0b0
> + >;
> + };
> +
> pinctrl_pwm1: pwm1grp {
> fsl,pins = <
> MX6UL_PAD_GPIO1_IO08__PWM1_OUT 0x110b0
>
