linux-kernel - Re: [PATCH v10 5/6] spi: at91-usart: add driver for at91-usart as spi

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Message-ID: <20180713100633.GR16084@piout.net>
Date:   Fri, 13 Jul 2018 12:06:33 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Radu Pirea <radu.pirea@...rochip.com>
Cc:     Mark Brown <broonie@...nel.org>, nicolas.ferre@...rochip.com,
        lee.jones@...aro.org, richard.genoud@...il.com, robh+dt@...nel.org,
        mark.rutland@....com, gregkh@...uxfoundation.org,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH v10 5/6] spi: at91-usart: add driver for at91-usart as spi

On 13/07/2018 12:56:22+0300, Radu Pirea wrote:
> 
> 
> On 07/10/2018 09:15 PM, Mark Brown wrote:
> > On Mon, Jun 25, 2018 at 08:22:29PM +0300, Radu Pirea wrote:
> > 
> > This is mostly good, just a couple of small things:
> > 
> > > +config SPI_AT91_USART
> > > +	tristate "Atmel USART Controller SPI driver"
> > > +	depends on HAS_DMA
> > > +	depends on (ARCH_AT91 || COMPILE_TEST)
> > > +	select MFD_AT91_USART
> > 
> > Why is this selecting rather than depending on the MFD like we normally
> > do?
> > 
> 
> Hi Mark,
> 
> If I add depends instead of select, current defconfigs will be broken and
> the proper driver will not be selected. Like this, there is no required
> change in any defconfig. Selecting the serial or spi driver from menuconfig
> makes the MFD completely transparent.

I would say that this is true for the USART part but the SPI part can
use a depends on as it didn't exist before.


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