linux-kernel - Re: [PATCH 4/4] arm64: dts: meson: add libretech-pc boards support

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Message-ID: <CAFBinCDMxf6tJt+bkfN7W5CMJrqZ+F1zTC=q8xmYtxg7gpEJxg@mail.gmail.com>
Date:   Sun, 8 Dec 2019 19:05:16 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Jerome Brunet <jbrunet@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: meson: add libretech-pc boards support

Hi Jerome,

this is looking good overall - I have some questions / nit-picks below

On Fri, Dec 6, 2019 at 11:02 AM Jerome Brunet <jbrunet@...libre.com> wrote:
[...]
> +       adc_keys {
on most boards we use "adc-keys" instead of "adc_keys"

[...]
> +               button-onoff {
> +                       label = "On/Off";
> +                       linux,code = <KEY_VENDOR>;
based on the label I assumed that the code is KEY_POWER
why is KEY_VENDOR the better choice here?

[...]
> +       cvbs-connector {
> +               compatible = "composite-video-connector";
> +               status = "disabled";
is there CVBS on the board? if I remember correctly the VPU driver
works fine when omitting the CVBS connector
so if the board doesn't have it you may drop the whole node instead of
keeping it disabled

[...]
> +       leds {
> +               compatible = "gpio-leds";
> +
> +               green {
> +                       label = "librecomputer:green:disk";
you can use the "function" and "color" properties instead of the (now
deprecated) "label"

[...]
> +&external_mdio {
> +       external_phy: ethernet-phy@0 {
> +               reg = <0>;
it would be great to have a comment above which PHY is used on this board

> +               max-speed = <1000>;
> +               reset-assert-us = <10000>;
> +               reset-deassert-us = <30000>;
> +               reset-gpios = <&gpio GPIOZ_14 GPIO_ACTIVE_LOW>;
> +               interrupt-parent = <&gpio_intc>;
a comment like /* MAC_INTR on GPIOZ_15 */ would be great here
> +               interrupts = <25 IRQ_TYPE_LEVEL_LOW>;

[...]
> +&pinctrl_periphs {
> +       /*
> +        * Make sure the reset pin of the usb HUB is driven high to take
> +        * it out of reset.
> +        */
> +       usb1_rst_pins: usb1_rst_irq {
> +               mux {
> +                       groups = "GPIODV_3";
> +                       function = "gpio_periphs";
> +                       bias-disable;
> +                       output-high;
> +               };
> +       };
on other boards (like Odroid-C2) we use a GPIO hog for this. I'm not
sure which one is better

[...]
> +&pinctrl_periphs {
> +       /*
> +        * Make sure the irq pin of the TYPE C controller is not driven
> +        * by the SoC.
is this because the SoC default configuration pulls the IRQ line LOW,
which then generates "phantom" IRQs?

[...]
> +       fusb302@22 {
typec-portc@22

[...]
> +               interrupt-parent = <&gpio_intc>;
> +               interrupts = <59 IRQ_TYPE_LEVEL_LOW>;
a comment above with the GPIO number would be great


Martin