linux-kernel - Re: [PATCH 1/4] spi: qup: Remove chip select function

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Message-ID: <1400486858.1464.11.camel@iivanov-dev>
Date:	Mon, 19 May 2014 11:07:38 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Andy Gross <agross@...eaurora.org>
Cc:	Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Bjorn Andersson <bjorn.andersson@...ymobile.com>
Subject: Re: [PATCH 1/4] spi: qup: Remove chip select function


Hi Andy,

On Tue, 2014-05-13 at 16:34 -0500, Andy Gross wrote:
> This patch removes the chip select function.  Chip select should instead be
> supported using GPIOs, defining the DT entry "cs-gpios", and letting the SPI
> core assert/deassert the chip select as it sees fit.
> 
> Signed-off-by: Andy Gross <agross@...eaurora.org>

<snip>

> +- num-cs:	total number of chipselects

My understanding is that "num-cs" have to be parsed by
master driver, not by core SPI driver.

> -
> -	/* Disable auto CS toggle and use manual */
> -	iocontol &= ~SPI_IO_C_MX_CS_MODE;

Probably we should keep this?

Regards,
Ivan

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