linux-kernel - Re: [PATCH v2] hwmon: (sun4i-lradc) Add driver for LRADC found on Allwinner A13/A20 SoC

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Message-ID: <20220503160713.7kdikhd5kkgkotcp@houat>
Date:   Tue, 3 May 2022 18:07:13 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Ruslan Zalata <rz@...micro.ru>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Jean Delvare <jdelvare@...e.com>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v2] hwmon: (sun4i-lradc) Add driver for LRADC found on
 Allwinner A13/A20 SoC

Hi,

On Tue, May 03, 2022 at 01:50:39PM +0500, Ruslan Zalata wrote:
> > I guess a better path forward would be to either register an hwmon
> > device in the original driver, or convert that driver to iio and use
> > iio-hwmon.
> 
> My first idea was to add hwmon to sun4i-lradc-keys.c driver. But soon as I
> began hacking the driver I quickly realized that it would be a mess since
> keyboard and hwmon belong to two different subsystems.

That's not really an issue in itself. There's plenty of drivers in Linux
that register into two frameworks.

> Besides we would need to invent a way to control which way the driver
> works (new bindings?).

I got confused there, and thought you were adding temperature reading
that is in another ADC on those SoCs, sorry. Yeah, that doesn't make
much sense to have both in the same drivers here.

Maxime

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