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Date:   Fri, 25 Mar 2022 01:06:36 +0200
From:   Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To:     Marcel Ziswiler <marcel@ziswiler.com>
Cc:     linux-arm-kernel@lists.infradead.org,
        Marcel Ziswiler <marcel.ziswiler@toradex.com>,
        Alex Marginean <alexandru.marginean@nxp.com>,
        Alexander Stein <alexander.stein@ew.tq-group.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Dong Aisheng <aisheng.dong@nxp.com>,
        Fabio Estevam <festevam@gmail.com>,
        Frank Rowand <frowand.list@gmail.com>,
        NXP Linux Team <linux-imx@nxp.com>,
        Olof Johansson <olof@lixom.net>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Reinhold Mueller <reinhold.mueller@emtrion.com>,
        Rob Herring <robh+dt@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Shawn Guo <shawnguo@kernel.org>,
        Tim Harvey <tharvey@gateworks.com>, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/3] arm64: dts: freescale: add initial support for
 verdin imx8m plus
Message-ID: <Yjz5fBwxhr0aBNsU@pendragon.ideasonboard.com>
References: <20220323143600.170778-1-marcel@ziswiler.com>
 <20220323143600.170778-4-marcel@ziswiler.com>
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Hi Marcel,

A couple more comments.

On Wed, Mar 23, 2022 at 03:36:00PM +0100, Marcel Ziswiler wrote:
> From: Marcel Ziswiler <marcel.ziswiler@toradex.com>
> 
> This patch adds the device tree to support Toradex Verdin iMX8M Plus [1]
> a computer on module which can be used on different carrier boards.
> 
> The module consists of an NXP i.MX 8M Plus family SoC (either i.MX 8M
> Plus Quad or 8M Plus QuadLite), a PCA9450C PMIC, a Gigabit Ethernet PHY,
> 1, 2, 4 or 8 GB of LPDDR4 RAM, an eMMC, a TLA2024 ADC, an I2C EEPROM, an
> RX8130 RTC, an optional I2C temperature sensor plus an optional
> Bluetooth/Wi-Fi module.
> 
> Anything that is not self-contained on the module is disabled by
> default.
> 
> The device tree for the Dahlia includes the module's device tree and
> enables the supported peripherals of the carrier board.
> 
> The device tree for the Verdin Development Board includes the module's
> device tree as well as the Dahlia one as it is a superset and supports
> almost all peripherals available.
> 
> So far there is no display functionality supported at all but basic
> console UART, USB host, eMMC and Ethernet functionality work fine.
> 
> [1] https://www.toradex.com/computer-on-modules/verdin-arm-family/nxp-imx-8m-plus
> 
> Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> ---
> 
> Changes in v2:
> - Fix capitatlisation of verdin in comments as reported by Laurent.
> - Add/modify todo comments as suggested by Laurent.
> - Add Laurent's reviewed- and tested-by tags.
> 
>  arch/arm64/boot/dts/freescale/Makefile        |    4 +
>  .../dts/freescale/imx8mp-verdin-dahlia.dtsi   |  129 ++
>  .../boot/dts/freescale/imx8mp-verdin-dev.dtsi |   44 +
>  .../imx8mp-verdin-nonwifi-dahlia.dts          |   18 +
>  .../freescale/imx8mp-verdin-nonwifi-dev.dts   |   18 +
>  .../dts/freescale/imx8mp-verdin-nonwifi.dtsi  |   54 +
>  .../freescale/imx8mp-verdin-wifi-dahlia.dts   |   18 +
>  .../dts/freescale/imx8mp-verdin-wifi-dev.dts  |   18 +
>  .../dts/freescale/imx8mp-verdin-wifi.dtsi     |   82 +
>  .../boot/dts/freescale/imx8mp-verdin.dtsi     | 1373 +++++++++++++++++
>  10 files changed, 1758 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-dahlia.dtsi
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-dev.dtsi
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-nonwifi-dahlia.dts
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-nonwifi-dev.dts
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-nonwifi.dtsi
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-wifi-dahlia.dts
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-wifi-dev.dts
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin-wifi.dtsi
>  create mode 100644 arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi

[snip]

> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
> new file mode 100644
> index 000000000000..8cad1d865720
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-verdin.dtsi
> @@ -0,0 +1,1373 @@

[snip]

> +/* Verdin I2C_2_DSI */
> +&i2c2 {
> +	clock-frequency = <10000>;

Did you really mean 10kHz here, not 100kHz ?

> +	pinctrl-names = "default", "gpio";
> +	pinctrl-0 = <&pinctrl_i2c2>;
> +	pinctrl-1 = <&pinctrl_i2c2_gpio>;

Shouldn't you also specify scl-gpios and sda-gpios, like for the other
I2C buses ?

> +
> +	atmel_mxt_ts_mezzanine: touch-mezzanine@4a {
> +		compatible = "atmel,maxtouch";
> +		/* Verdin GPIO_3 (SODIMM 210) */
> +		interrupt-parent = <&gpio1>;
> +		interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
> +		reg = <0x4a>;
> +		/* Verdin GPIO_2 (SODIMM 208) */
> +		reset-gpios = <&gpio1 1 GPIO_ACTIVE_HIGH>;
> +		status = "disabled";
> +	};
> +};

[snip]

-- 
Regards,

Laurent Pinchart