Subject: Re: [PATCH 04/10] arm64: dts: imx8mm: Add Engicam i.Core MX8M Mini SOM

From: Krzysztof Kozlowski <[email-masked]>
Date: Wed, 2 Dec 2020 19:34:05 +0200

On Wed, Dec 02, 2020 at 05:42:35PM +0530, Jagan Teki wrote:
> i.Core MX8M Mini is an EDIMM SOM based on NXP i.MX8MM from Engicam.

s/SOM/SoM/

> General features:
> - NXP i.MX8MM

i.MX 8M Mini
as named by NXP:
https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i-mx-applications-processors/i-mx-8-processors/i-mx-8m-mini-arm-cortex-a53-cortex-m4-audio-voice-video:i.MX8MMINI

> - Up to 2GB LDDR4
> - 8/16GB eMMC
> - Gigabit Ethernet
> - USB 2.0 Host/OTG
> - PCIe Gen2 interface
> - I2S
> - MIPI DSI to LVDS
> - rest of i.MX8MM features

Ditto

> 
> i.Core MX8M Mini needs to mount on top of Engicam baseboards for
> creating complete platform boards.
> 
> Possible baseboards are,
> - EDIMM2.2
> - C.TOUCH 2.0

Don't describe baseboards. You add here only SoM.

> 
> Add support for it.
> 
> Signed-off-by: Matteo Lisi <[email-masked]>
> Signed-off-by: Jagan Teki <[email-masked]>
> ---
>  .../freescale/imx8mm-engicam-icore-mx8mm.dtsi | 209 ++++++++++++++++++
>  1 file changed, 209 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mm-engicam-icore-mx8mm.dtsi
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-engicam-icore-mx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-engicam-icore-mx8mm.dtsi
> new file mode 100644
> index 000000000000..b87917c40587
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-engicam-icore-mx8mm.dtsi
> @@ -0,0 +1,209 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2018 NXP
> + * Copyright (c) 2019 Engicam srl
> + * Copyright (c) 2020 Amarula Solutons(India)
> + */
> +
> +/ {

Missing "model".

> +	compatible = "engicam,icore-mx8mm", "fsl,imx8mm";
> +};
> +

No memory node? Isn't the memory a property of SoM?

> +&A53_0 {
> +	cpu-supply = <&reg_buck4>;
> +};

Supplies for the other cores.

> +
> +&i2c1 {
> +	clock-frequency = <400000>;
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_i2c1>;
> +	status = "okay";
> +
> +	pf8100@8 {

Node name should describe generic class of a device, so probably you
wanted here "pmic".

> +		compatible = "nxp,pf8x00";
> +		reg = <0x08>;
> +
> +		regulators {
> +			reg_ldo1: ldo1 {
> +				regulator-always-on;
> +				regulator-boot-on;

First min/max constraints. Then always-on and boot-on properties.

> +				regulator-max-microvolt = <5000000>;
> +				regulator-min-microvolt = <1500000>;
> +			};
> +
> +			reg_ldo2: ldo2 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <5000000>;
> +				regulator-min-microvolt = <1500000>;
> +			};
> +
> +			reg_ldo3: ldo3 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <5000000>;
> +				regulator-min-microvolt = <1500000>;
> +			};
> +
> +			reg_ldo4: ldo4 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <5000000>;
> +				regulator-min-microvolt = <1500000>;
> +			};
> +
> +			reg_buck1: buck1 {
> +				fsl,ilim-ma = <4500>;

Where is this property documented?

> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <1800000>;
> +				regulator-min-microvolt =  <400000>;
> +			};
> +
> +			reg_buck2: buck2 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <1800000>;
> +				regulator-min-microvolt =  <400000>;
> +			};
> +
> +			reg_buck3: buck3 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <1800000>;
> +				regulator-min-microvolt =  <400000>;
> +			};
> +
> +			reg_buck4: buck4 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <1800000>;
> +				regulator-min-microvolt =  <400000>;
> +				fast-slew = <1>;

Where is this property documented?

> +			};
> +
> +			reg_buck5: buck5 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <1800000>;
> +				regulator-min-microvolt =  <400000>;
> +			};
> +
> +			reg_buck6: buck6 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <1800000>;
> +				regulator-min-microvolt =  <400000>;
> +			};
> +
> +			reg_buck7: buck7 {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-min-microvolt = <3300000>;
> +			};
> +
> +			reg_vsnvs: vsnvs {
> +				regulator-always-on;
> +				regulator-boot-on;
> +				regulator-max-microvolt = <3300000>;
> +				regulator-min-microvolt = <1800000>;
> +			};
> +		};
> +	};
> +};
> +
> +&iomuxc {
> +	pinctrl_i2c1: i2c1grp {
> +		fsl,pins = <
> +			MX8MM_IOMUXC_I2C1_SCL_I2C1_SCL		0x400001c3
> +			MX8MM_IOMUXC_I2C1_SDA_I2C1_SDA		0x400001c3
> +		>;
> +	};
> +
> +	pinctrl_uart2: uart2grp {

Not used.

> +		fsl,pins = <
> +			MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX	0x140
> +			MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX	0x140
> +		>;
> +	};
> +
> +	pinctrl_usdhc1_gpio: usdhc1grpgpio {

This should complain on bindings check. Please run dtbs_check. The "grp"
should be a suffix in node name, so "usdhc1gpiogrp".

> +		fsl,pins = <
> +			MX8MM_IOMUXC_GPIO1_IO06_GPIO1_IO6	0x41
> +		>;
> +	};
> +
> +	pinctrl_usdhc1: usdhc1grp {

Not used.

Best regards,
Krzysztof

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