linux-kernel - Re: [PATCH] platform/x86: Add Steam Deck driver

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Date:   Thu, 17 Feb 2022 17:35:12 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Andrey Smirnov <andrew.smirnov@...il.com>,
        platform-driver-x86@...r.kernel.org
Cc:     Mark Gross <markgross@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH] platform/x86: Add Steam Deck driver

Hi,

On 2/6/22 03:20, Andrey Smirnov wrote:
> Add a driver exposing various bits and pieces of functionality
> provided by Steam Deck specific VLV0100 device presented by EC
> firmware. This includes but not limited to:
> 
>     - CPU/device's fan control
>     - Read-only access to DDIC registers
>     - Battery tempreature measurements
>     - Various display related control knobs
>     - USB Type-C connector event notification
> 
> Cc: Hans de Goede <hdegoede@...hat.com>
> Cc: Mark Gross <markgross@...nel.org>
> Cc: Jean Delvare <jdelvare@...e.com>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: linux-kernel@...r.kernel.org (open list)
> Cc: platform-driver-x86@...r.kernel.org
> Cc: linux-hwmon@...r.kernel.org
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>

The .c file says: "Copyright (C) 2021-2022 Valve Corporation", yet
you use a personal email address here. This is not really a problem,
but it does look a bit weird.

> ---
> 
> This driver is really a kitchen sink of various small bits. Maybe it
> is worth splitting into an MFD + child drivers/devices?

With the extcon stuff thrown in the mix I think you definitely should
go for using MFD here.

Then you can submit a MFD driver under drivers/mfd for registering the
regmap + the cells + separate extcon + LED + backlight + hwmon drivers to
their resp. subsystems.

As drivers/platform/x86/ maintainer I would be happy to take a driver
for a "misc" cell for any remaining bits if there are any...

<snip>

> +struct steamdeck {
> +	struct acpi_device *adev;
> +	struct device *hwmon;
> +	void *regmap;

That should be:

	struct regmap *regmap;


> +	long fan_target;
> +	struct delayed_work role_work;
> +	struct extcon_dev *edev;
> +	struct device *dev;
> +};

Regards,

Hans