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spi: omap2-mcspi: Convert to use GPIO descriptors 

The OMAP2 MCSPI has some kind of half-baked GPIO CS support:
it includes code like this:

  if (gpio_is_valid(spi->cs_gpio)) {
        ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
	(...)

But it doesn't parse the "cs-gpios" attribute in the device
tree to count the number of GPIOs or pick out the GPIO numbers
and put these in the SPI master's .cs_gpios property.

We complete the implementation of supporting CS GPIOs
from the device tree and switch it over to use the SPI core
for this.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20200625231257.280615-1-linus.walleij@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Linus Walleij 2020-06-26 01:12:57 +02:00 committed by Mark Brown
parent 638d8488ae
commit f27b1dc641
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 16 deletions
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19
drivers/spi/spi-omap2-mcspi.c
View File

@ -27,7 +27,6 @@
#include <linux/iopoll.h>
#include <linux/spi/spi.h>
#include <linux/gpio.h>
#include <linux/platform_data/spi-omap2-mcspi.h>
@ -1043,16 +1042,6 @@ static int omap2_mcspi_setup(struct spi_device *spi)
spi->controller_state = cs;
/* Link this to context save list */
list_add_tail(&cs->node, &ctx->cs);
if (gpio_is_valid(spi->cs_gpio)) {
ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
if (ret) {
dev_err(&spi->dev, "failed to request gpio\n");
return ret;
}
gpio_direction_output(spi->cs_gpio,
!(spi->mode & SPI_CS_HIGH));
}
}
ret = pm_runtime_get_sync(mcspi->dev);
@ -1080,9 +1069,6 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
kfree(cs);
}
if (gpio_is_valid(spi->cs_gpio))
gpio_free(spi->cs_gpio);
}
static irqreturn_t omap2_mcspi_irq_handler(int irq, void *data)
@ -1152,7 +1138,7 @@ static int omap2_mcspi_transfer_one(struct spi_master *master,
omap2_mcspi_set_enable(spi, 0);
if (gpio_is_valid(spi->cs_gpio))
if (spi->cs_gpiod)
omap2_mcspi_set_cs(spi, spi->mode & SPI_CS_HIGH);
if (par_override ||
@ -1241,7 +1227,7 @@ out:
omap2_mcspi_set_enable(spi, 0);
if (gpio_is_valid(spi->cs_gpio))
if (spi->cs_gpiod)
omap2_mcspi_set_cs(spi, !(spi->mode & SPI_CS_HIGH));
if (mcspi->fifo_depth > 0 && t)
@ -1431,6 +1417,7 @@ static int omap2_mcspi_probe(struct platform_device *pdev)
master->dev.of_node = node;
master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ;
master->min_speed_hz = OMAP2_MCSPI_MAX_FREQ >> 15;
master->use_gpio_descriptors = true;
platform_set_drvdata(pdev, master);