linux-kernel - Re: [PATCH] arm64: dts: qcom: Add Lenovo Miix 630

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Message-ID: <20190408110348.GF6139@lakrids.cambridge.arm.com>
Date:   Mon, 8 Apr 2019 12:03:49 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     bjorn.andersson@...aro.org, andy.gross@...aro.org,
        david.brown@...aro.org, robh+dt@...nel.org, lee.jones@...aro.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: qcom: Add Lenovo Miix 630

On Tue, Mar 26, 2019 at 11:55:25AM -0700, Jeffrey Hugo wrote:
> This adds the initial DT for the Lenovo Miix 630 laptop.  Supported
> functionality includes USB (host), microSD-card, keyboard, and trackpad.

I was under the impression that the Miix 630 came with Windows, and the
firmware therefore provided (as least a simulacrum of) ACPI. Why do we
need a DT?

[...]

> +++ b/arch/arm64/boot/dts/qcom/msm8998-cls.dtsi
> @@ -0,0 +1,278 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2019, Jeffrey Hugo. All rights reserved. */
> +
> +/*
> + * Common include for MSM8998 clamshell (cls) devices, ie the Lenovo Miix 630,
> + * Asus NovaGo TP370QL, and HP Envy x2.  All three devices are basically the
> + * same, with differences in peripherals.
> + */

I think it would be better to consistently use "clamshell" (e.g. rename
this to msm8998-clamshell.dtsi), and mention the "cls" terminology in
the comment if that's necessary.

[...]

> +	keyboard@3a {
> +		/* QTEC0001 is the ACPI HID, which could be used for quirks */
> +		compatible = "QTEC0001", "hid-over-i2c";

Please give this a real compatible string rather than forcing the ACPI
HID in.

Thanks,
Mark.