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Date: Wed, 19 Dec 2012 15:09:25 +0000 From: Grant Likely <grant.likely@...retlab.ca> To: Federico Vaga <federico.vaga@...il.com> Cc: spi-devel-general@...ts.sourceforge.net, linux-kernel@...r.kernel.org, Federico Vaga <federico.vaga@...il.com> Subject: Re: [PATCH RFC] spidev.c: add sysfs attributes for SPI configuration On Sat, 24 Nov 2012 18:20:08 +0100, Federico Vaga <federico.vaga@...il.com> 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 <federico.vaga@...il.com> 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 configuration. g. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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