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

[Jagan Teki <jagan@amarulasolutions.com>]

Hi Krzysztof,

On Wed, Dec 2, 2020 at 11:04 PM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> 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.

It's just information on how this SoM is being used. Let me know any
issues while explaining the combinations being used here.

>
> >
> > Add support for it.
> >
> > Signed-off-by: Matteo Lisi <matteo.lisi@engicam.com>
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > ---
> >  .../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".

SoM dtsi won't comprise the model it has its own binding and while
combination board has a model that will include this binding. Please
check to exist binding file.
arch/arm64/boot/dts/rockchip/px30-engicam-px30-core.dtsi

>
> > +     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".

True, will update.

>
> > +             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?

Sorry it would be nxp,ilim-ma I will update in next version.

>
> > +                             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".

Yes, will update it on the next version.

Jagan.