nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

spi: Fix SPI_CS_HIGH setting when using native and GPIO CS

Browse source 
When improving the CS GPIO support at core level, the SPI_CS_HIGH
has been enabled for all the CS lines used for a given SPI controller.

However, the SPI framework allows to have on the same controller native
CS and GPIO CS. The native CS may not support the SPI_CS_HIGH, so they
should not be setup automatically.

With this patch the setting is done only for the CS that will use a
GPIO as CS

Fixes: f3186dd876 ("spi: Optionally use GPIO descriptors for CS GPIOs")
Cc: <stable@vger.kernel.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191018152929.3287-1-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gregory CLEMENT 2019-10-18 17:29:29 +02:00 committed by Mark Brown
parent b2662a164f
commit 3e5ec1db8b
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 9 additions and 9 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

18
drivers/spi/spi.c
View file

@ -1711,15 +1711,7 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
spi->mode |= SPI_3WIRE;
if (of_property_read_bool(nc, "spi-lsb-first"))
spi->mode |= SPI_LSB_FIRST;
/*
* For descriptors associated with the device, polarity inversion is
* handled in the gpiolib, so all chip selects are "active high" in
* the logical sense, the gpiolib will invert the line if need be.
*/
if (ctlr->use_gpio_descriptors)
spi->mode |= SPI_CS_HIGH;
else if (of_property_read_bool(nc, "spi-cs-high"))
if (of_property_read_bool(nc, "spi-cs-high"))
spi->mode |= SPI_CS_HIGH;
/* Device DUAL/QUAD mode */
@ -1783,6 +1775,14 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
}
spi->chip_select = value;
/*
* For descriptors associated with the device, polarity inversion is
* handled in the gpiolib, so all gpio chip selects are "active high"
* in the logical sense, the gpiolib will invert the line if need be.
*/
if ((ctlr->use_gpio_descriptors) && ctlr->cs_gpiods[spi->chip_select])
spi->mode |= SPI_CS_HIGH;
/* Device speed */
rc = of_property_read_u32(nc, "spi-max-frequency", &value);
if (rc) {