linux-sg2042/drivers/spi
Stanislaw Gruszka 5b96f17290 atmel_spi: allow transfer when max_speed_hz = 0
For some reason I have to slowdown clock to touchscreen device.

In atmel_spi_setup() there is comment that max_speed_hz == 0 means as slow
as possible and divider is set to maximum value.  But in
atmel_spi_transfer() function is check against not zero max_speed_hz with
EINVAL returned.

Probably driver should setup divider for each transfer based on
transfer->speed_hz value, but I think that would be not necessary overhead
as all used devices have constant clock.

Below patch works fine for me.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-15 16:39:35 -08:00
..
Kconfig spi_gpio driver 2009-01-06 15:59:19 -08:00
Makefile spi_gpio driver 2009-01-06 15:59:19 -08:00
at25.c spi: at25 driver is for EEPROM not FLASH 2007-12-05 09:21:18 -08:00
atmel_spi.c atmel_spi: allow transfer when max_speed_hz = 0 2009-01-15 16:39:35 -08:00
atmel_spi.h [PATCH] SPI: atmel_spi driver 2007-02-14 08:09:53 -08:00
au1550_spi.c spi: au1550_spi full duplex dma fix 2008-12-01 19:55:24 -08:00
mpc52xx_psc_spi.c spi: mpc52xx_psc_spi chipselect bugfix 2008-12-01 19:55:24 -08:00
omap2_mcspi.c [ARM] omap: convert OMAP drivers to use ioremap() 2008-09-05 17:02:30 +01:00
omap_uwire.c [ARM] omap: convert OMAP drivers to use ioremap() 2008-09-05 17:02:30 +01:00
orion_spi.c orion_spi: handle 88F6183 erratum 2008-10-16 11:21:38 -07:00
pxa2xx_spi.c drivers/spi: move a dereference below a NULL test 2009-01-06 15:59:20 -08:00
spi.c spi: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:37 -08:00
spi_bfin5xx.c spi_bfin5xx: use PIO for full duplex, not DMA 2008-05-01 08:04:01 -07:00
spi_bitbang.c spi: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:37 -08:00
spi_butterfly.c spi: struct device - replace bus_id with dev_name(), dev_set_name() 2009-01-06 10:44:37 -08:00
spi_gpio.c spi_gpio driver 2009-01-06 15:59:19 -08:00
spi_imx.c spi: fix spi_imx probe oopsing 2008-12-01 19:55:24 -08:00
spi_lm70llp.c hwmon: (lm70) Code streamlining and cleanup 2009-01-07 16:37:34 +01:00
spi_mpc83xx.c spi_mpc83xx: reject invalid transfer sizes 2008-09-13 14:41:51 -07:00
spi_s3c24xx.c spi: use generic gpio calls in spi_s3c24xx_gpio 2009-01-06 15:59:19 -08:00
spi_s3c24xx_gpio.c spi: fix spi_s3c24xx_gpio num_chipselect 2008-12-01 19:55:24 -08:00
spi_sh_sci.c spi: fix platform driver hotplug/coldplug 2008-04-11 08:06:43 -07:00
spi_txx9.c spi: fix platform driver hotplug/coldplug 2008-04-11 08:06:43 -07:00
spidev.c spi: avoid spidev crash when device is removed 2008-12-01 19:55:24 -08:00
tle62x0.c tle62x0 driver stops ignoring read errors 2007-11-14 18:45:42 -08:00
xilinx_spi.c Xilinx: SPI: updated driver for device tree 2009-01-09 16:01:53 -07:00