]> git.baikalelectronics.ru Git - kernel.git/commit
spi: imx: GPIO based chip selects should not be required
authorTrent Piepho <tpiepho@impinj.com>
Tue, 31 Oct 2017 19:49:04 +0000 (12:49 -0700)
committerMark Brown <broonie@kernel.org>
Fri, 10 Nov 2017 21:28:09 +0000 (21:28 +0000)
commit8dc99f657c2632ced492abb76617bebe0f8388c5
treef1b4c669c780d8ec548f1df1415a1912d254c726
parentb34a76282d8401f41942e06e7a925d16998e4cb4
spi: imx: GPIO based chip selects should not be required

The driver will fail to load if no gpio chip selects are specified,
this patch changes this so that it no longer fails.

It's possible to use all native chip selects, in which case there is
no reason to have a gpio chip select array.  This is what happens if
the *optional* device tree property "cs-gpios" is omitted.

The spi core already checks for the absence of gpio chip selects in
the master and assigns any slaves the gpio_cs value of -ENOENT.

Also have the driver respect the standard SPI device tree property "num-cs"
to allow setting the number of chip selects without using cs-gpios.

CC: Mark Brown <broonie@kernel.org>
CC: Shawn Guo <shawnguo@kernel.org>
CC: Sascha Hauer <kernel@pengutronix.de>
CC: Fabio Estevam <fabio.estevam@nxp.com>
CC: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Trent Piepho <tpiepho@impinj.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
drivers/spi/spi-imx.c