linux-kernel - Re: [PATCH v4 3/6] mfd: at91-usart: added mfd driver for usart

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Date:   Tue, 29 May 2018 11:32:00 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Radu Pirea <radu.pirea@...rochip.com>,
        Mark Brown <broonie@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Lee Jones <lee.jones@...aro.org>,
        Richard Genoud <richard.genoud@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>
Subject: Re: [PATCH v4 3/6] mfd: at91-usart: added mfd driver for usart

On 28/05/2018 11:00:49+0300, Andy Shevchenko wrote:
> On Fri, May 25, 2018 at 8:19 PM, Radu Pirea <radu.pirea@...rochip.com> wrote:
> > This mfd driver is just a wrapper over atmel_serial driver and
> > spi-at91-usart driver. Selection of one of the drivers is based on a
> > property from device tree. If the property is not specified, the default
> > driver is atmel_serial.
> 
> > +       depends on OF
> 
> What makes this driver OF specific?
> 
> > +       err = of_property_read_u32(np, "atmel,usart-mode", &opmode);
> 
> Check unified device property API.
> 

We don't care, this makes the driver OF specific and this is the correct
thing to do.


-- 
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com