linux-kernel - Re: [PATCH v2 3/3] arm64: dts: freescale: add initial support for verdin imx8m plus

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Date:   Fri, 25 Mar 2022 08:17:18 +0000
From:   Marcel Ziswiler <marcel.ziswiler@...adex.com>
To:     "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>
CC:     "linux-imx@....com" <linux-imx@....com>,
        "aisheng.dong@....com" <aisheng.dong@....com>,
        "reinhold.mueller@...rion.com" <reinhold.mueller@...rion.com>,
        "frowand.list@...il.com" <frowand.list@...il.com>,
        "alexander.stein@...tq-group.com" <alexander.stein@...tq-group.com>,
        "olof@...om.net" <olof@...om.net>,
        "tharvey@...eworks.com" <tharvey@...eworks.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "arnd@...db.de" <arnd@...db.de>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "festevam@...il.com" <festevam@...il.com>,
        "alexandru.marginean@....com" <alexandru.marginean@....com>
Subject: Re: [PATCH v2 3/3] arm64: dts: freescale: add initial support for
 verdin imx8m plus

Hi Laurent

On Fri, 2022-03-25 at 01:06 +0200, Laurent Pinchart wrote:
> Hi Marcel,
> 
> A couple more comments.
> 
> On Wed, Mar 23, 2022 at 03:36:00PM +0100, Marcel Ziswiler wrote:
> > From: Marcel Ziswiler <marcel.ziswiler@...adex.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@...adex.com>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Tested-by: Laurent Pinchart <laurent.pinchart@...asonboard.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 ?

Yes, we really saw issues with certain displays/screens in the past. I mean, it's not like reading a few bytes
off a DDC/EDID at such low-speed makes much of a difference time-wise. So we rather avoid issues. Anyway, could
easily be overridden in a custom carrier board device tree should that I2C bus be used for something where
speed might matter.

> > +       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 ?

Yes, working on the Verdin iMX8M Mini update patch set of late and comparing stuff I also just discovered that
one yesterday. Will send a v3 shortly. Thanks!

> > +
> > +       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]