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Date:	Wed, 19 Dec 2012 15:09:25 +0000
From:	Grant Likely <>
To:	Federico Vaga <>
	Federico Vaga <>
Subject: Re: [PATCH RFC] spidev.c: add sysfs attributes for SPI configuration

On Sat, 24 Nov 2012 18:20:08 +0100, Federico Vaga <> wrote:
> This patch introduce the use of the sysfs attribute for the spidev
> configuration. This avoid the user to have a specific program which does
> ioctl() on spidev. The user can easily does cat (to read) and echo (to
> write) on the sysfs file and configure SPI.
> The patch exports the following attributes: bits-per-word, lsb-first,
> mode and speed-hz.
> Example:
>     # cat /sys/bus/spi/devices/spi1.0/speed-hz
>     500000
>     # echo 450000 > /sys/bus/spi/devices/spi1.0/speed-hz
>     # dmesg | tail -n 4
>     spidev spi1.0: DEactivate 60, mr 000f0011
>     spidev spi1.0: setup: 449447 Hz bpw 8 mode 0x0 -> csr0 0000dd02
>     spidev spi1.0: setup mode 0, 8 bits/w, 450000 Hz max --> 0
>     spidev spi1.0: 450000 Hz (max)
> Signed-off-by: Federico Vaga <>

Not a good idea. sysfs is not a good place for operational interfaces.
Please use the spi character devices for direct manipulation of the SPI

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