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

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Message-ID: <20150428225057.GB19294@deathray>
Date:	Tue, 28 Apr 2015 17:50:57 -0500
From:	Michael Welling <mwelling@...e.org>
To:	Ezequiel Garcia <ezequiel.garcia@...tec.com>
Cc:	Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] spi: omap2-mcspi: Add support for GPIO chipselects

On Tue, Apr 28, 2015 at 11:04:09AM -0300, Ezequiel Garcia wrote:
> On 04/27/2015 10:21 PM, Michael Welling wrote:
> > 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?
> 
> We've recently done that for spi-img-spfi.c.
>

Okay, thanks for pointing that out.
 
> -- 
> Ezequiel
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