Commit 3e5ec1db authored by Gregory CLEMENT's avatar Gregory CLEMENT Committed by Mark Brown

spi: Fix SPI_CS_HIGH setting when using native and GPIO CS

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: f3186dd8 ("spi: Optionally use GPIO descriptors for CS GPIOs")
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarGregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20191018152929.3287-1-gregory.clement@bootlin.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent b2662a16
...@@ -1711,15 +1711,7 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, ...@@ -1711,15 +1711,7 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
spi->mode |= SPI_3WIRE; spi->mode |= SPI_3WIRE;
if (of_property_read_bool(nc, "spi-lsb-first")) if (of_property_read_bool(nc, "spi-lsb-first"))
spi->mode |= SPI_LSB_FIRST; spi->mode |= SPI_LSB_FIRST;
if (of_property_read_bool(nc, "spi-cs-high"))
/*
* 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"))
spi->mode |= SPI_CS_HIGH; spi->mode |= SPI_CS_HIGH;
/* Device DUAL/QUAD mode */ /* Device DUAL/QUAD mode */
...@@ -1783,6 +1775,14 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, ...@@ -1783,6 +1775,14 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi,
} }
spi->chip_select = value; 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 */ /* Device speed */
rc = of_property_read_u32(nc, "spi-max-frequency", &value); rc = of_property_read_u32(nc, "spi-max-frequency", &value);
if (rc) { if (rc) {
......
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