linux-kernel - Re: [PATCH 1/2] spi: spi-mem: Add the spi_set_xfer

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Message-ID: <20180928132607.GK20825@sirena.org.uk>
Date:   Fri, 28 Sep 2018 14:26:07 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Chuanhua Han <chuanhua.han@....com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "eha@...f.com" <eha@...f.com>
Subject: Re: [PATCH 1/2] spi: spi-mem: Add the spi_set_xfer_bpw function

On Fri, Sep 28, 2018 at 09:18:33AM +0200, Boris Brezillon wrote:

> I might be wrong, but that's not my understanding of ->bits_per_word.
> To me, it's something that you can use when your *device* (not
> controller) expects non-byte aligned words [1]. The spi-mem protocol is

Yes, bits per word is a device setting.  SPI devices can have control
protocols that have words larger than a byte with a fixed byte order,
many controllers do the required byte swapping.

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