linux-kernel - Re: [PATCH v3 1/2] spi: support inter-word delay requirement for devices

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Message-ID: <20190128181038.GF11699@sirena.org.uk>
Date:   Mon, 28 Jan 2019 18:10:38 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jonas Bonn <jonas@...rbonn.se>
Cc:     linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 1/2] spi: support inter-word delay requirement for
 devices

On Sat, Jan 26, 2019 at 05:32:19PM +0100, Jonas Bonn wrote:

> @@ -164,6 +166,7 @@ struct spi_device {
>  	char			modalias[SPI_NAME_SIZE];
>  	const char		*driver_override;
>  	int			cs_gpio;	/* chip select gpio */
> +	uint16_t		word_delay;	/* inter-word delay (us) */

This needs some code in the core joining it up with the per-transfer
word delay similar to what we have for speed_hz and bits_per_word in
__spi_validate().  Then the controller drivers can just look at the
per-transfer value and support both without having to duplicate logic.

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