linux-kernel - Re: [spi-devel-general] adding bits_per_word to struct spi_board_info to mirror struct spi

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Message-Id: <200705072200.26888.david-b@pacbell.net>
Date:	Mon, 7 May 2007 22:00:26 -0700
From:	David Brownell <david-b@...bell.net>
To:	Bryan WU <bryan.wu@...log.com>
Cc:	Mike Frysinger <vapier.adi@...il.com>,
	spi-devel-general@...ts.sourceforge.net,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [spi-devel-general] adding bits_per_word to struct spi_board_info to mirror struct spi_device

On Monday 07 May 2007, Bryan WU wrote:

> currently, there are some duplicated data members in spi_device struct
> spi_board_info struct. This two structs are confused driver writers and
> boards driver users.

How would that confusion arise?  Only arch/.../board-xxx.c writers
normally even see spi_board_info; the exception is that someone who
writes an add-on board -- maybe a USB-to-SPI adapter -- would call the
rarely used spi_new_device() routine.

Developers writing a SPI drivers -- controller drivers touching some
SOC's serial controller hardware, or "struct spi_driver" protocol code
talking to a chip through such a controller -- never see board info.
They only see "struct spi_device".  So I don't see why they would have
a reason to be confused.

- Dave

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