linux-kernel - Re: [PATCH v2] spi: omap2-mcspi: Add support for GPIO chipselects

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Date:	Mon, 27 Apr 2015 20:21:50 -0500
From:	Michael Welling <mwelling@...e.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] spi: omap2-mcspi: Add support for GPIO chipselects

On Mon, Apr 27, 2015 at 08:55:50PM +0100, Mark Brown wrote:
> On Sun, Apr 26, 2015 at 10:44:30PM -0500, Michael Welling wrote:
> 
> > +	if (gpio_is_valid(spi->cs_gpio)) {
> > +		gpio_set_value(spi->cs_gpio, (cs_active) ?
> > +			!!(spi->mode & SPI_CS_HIGH) :
> > +			!(spi->mode & SPI_CS_HIGH));
> > +	}
> 
> Two problems here.  One is that the above logic statement is just not
> readable (the repitition of hecks, the ternery operator, the
> indentation...) and the other is that the core chipselect support
> already handles GPIO chipselects so you should really be converting the
> driver to use that.  At the very least the code needs to be legible
> though.

Before I send another patch how does this look?

	if (gpio_is_valid(spi->cs_gpio)) {
		if (cs_active)
			gpio_set_value(spi->cs_gpio, spi->mode & SPI_CS_HIGH);
		else
			gpio_set_value(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
	}

If I were to attempt to convert the driver to use the core chipselect support,
how would I go about doing it?

Is there another driver that I can use for reference?
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