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

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Date:   Mon, 2 May 2022 15:39:27 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Ruslan Zalata <rz@...micro.ru>, 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

On Mon, May 02, 2022 at 06:31:56AM -0700, Guenter Roeck wrote:
> On 5/2/22 04:00, Maxime Ripard wrote:
> > Hi,
> > 
> > On Thu, Apr 28, 2022 at 09:09:03PM +0000, Ruslan Zalata wrote:
> > > Some Allwinner SoCs like A13, A20 or T2 are equipped with two-channel
> > > low rate (6 bit) ADC that is often used for extra keys. There's a driver
> > > for that already implementing standard input device, but it has these
> > > limitations: 1) it cannot be used for general ADC data equisition, and
> > > 2) it uses only one LRADC channel of two available.
> > > 
> > > This driver provides basic hwmon interface to both channels of LRADC on
> > > such Allwinner SoCs.
> > > 
> > > Signed-off-by: Ruslan Zalata <rz@...micro.ru>
> > > ---
> > >   MAINTAINERS                       |   6 +
> > >   drivers/hwmon/Kconfig             |  13 ++
> > >   drivers/hwmon/Makefile            |   1 +
> > >   drivers/hwmon/sun4i-lradc-hwmon.c | 280 ++++++++++++++++++++++++++++++
> > >   4 files changed, 300 insertions(+)
> > >   create mode 100644 drivers/hwmon/sun4i-lradc-hwmon.c
> > > 
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index 5e8c2f61176..d9c71e94133 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -18861,6 +18861,12 @@ S:	Maintained
> > >   F:	Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
> > >   F:	drivers/input/keyboard/sun4i-lradc-keys.c
> > > +SUN4I LOW RES ADC HWMON DRIVER
> > > +M:	Ruslan Zalata <rz@...micro.ru>
> > > +L:	linux-hwmon@...r.kernel.org
> > > +S:	Maintained
> > > +F:	drivers/hwmon/sun4i-lradc-hwmon.c
> > > +
> > >   SUNDANCE NETWORK DRIVER
> > >   M:	Denis Kirjanov <kda@...ux-powerpc.org>
> > >   L:	netdev@...r.kernel.org
> > > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> > > index 68a8a27ab3b..86776488a81 100644
> > > --- a/drivers/hwmon/Kconfig
> > > +++ b/drivers/hwmon/Kconfig
> > > @@ -1691,6 +1691,19 @@ config SENSORS_SIS5595
> > >   	  This driver can also be built as a module. If so, the module
> > >   	  will be called sis5595.
> > > +config SENSORS_SUN4I_LRADC
> > > +	tristate "Allwinner A13/A20 LRADC hwmon"
> > > +	depends on ARCH_SUNXI && !KEYBOARD_SUN4I_LRADC
> > > +	help
> > > +	  Say y here to support the LRADC found in Allwinner A13/A20 SoCs.
> > > +	  Both channels are supported.
> > > +
> > > +	  This driver can also be built as module. If so, the module
> > > +	  will be called sun4i-lradc-hwmon.
> > > +
> > > +	  This option is not compatible with KEYBOARD_SUN4I_LRADC, one
> > > +	  of these must be used at a time.
> > 
> > How do you plan on enforcing that?
> > 
> 	depends on ARCH_SUNXI && !KEYBOARD_SUN4I_LRADC

Right, but that just doesn't fly for any generic distro / build-system.

Maxime

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