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authorTorsten Fleischer <torfl6749@gmail.com>2014-11-03 19:17:55 +0300
committerMark Brown <broonie@kernel.org>2014-11-04 22:57:25 +0300
commitd1d81802522ade84128a2c66c0d500e372474dca (patch)
tree971fe9a68d1fcc2823d5ab6cf90b0e0c6d8a9eef /drivers/spi/spi-gpio.c
parentf114040e3ea6e07372334ade75d1ee0775c355e1 (diff)
downloadlinux-d1d81802522ade84128a2c66c0d500e372474dca.tar.xz
spi: spi-gpio: Add dt support for a single device with no chip select
In order to describe a single slave device that has no chip select line the 'num-chipselects' property has to be <0> and the 'cs-gpios' property doesn't need to be set. Signed-off-by: Torsten Fleischer <torfl6749@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-gpio.c')
-rw-r--r--drivers/spi/spi-gpio.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 9f595535cf27..f0492c99d145 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -413,6 +413,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
struct spi_gpio_platform_data *pdata;
u16 master_flags = 0;
bool use_of = 0;
+ int num_devices;
status = spi_gpio_probe_dt(pdev);
if (status < 0)
@@ -422,16 +423,21 @@ static int spi_gpio_probe(struct platform_device *pdev)
pdata = dev_get_platdata(&pdev->dev);
#ifdef GENERIC_BITBANG
- if (!pdata || !pdata->num_chipselect)
+ if (!pdata || (!use_of && !pdata->num_chipselect))
return -ENODEV;
#endif
+ if (use_of && !SPI_N_CHIPSEL)
+ num_devices = 1;
+ else
+ num_devices = SPI_N_CHIPSEL;
+
status = spi_gpio_request(pdata, dev_name(&pdev->dev), &master_flags);
if (status < 0)
return status;
master = spi_alloc_master(&pdev->dev, sizeof(*spi_gpio) +
- (sizeof(int) * SPI_N_CHIPSEL));
+ (sizeof(int) * num_devices));
if (!master) {
status = -ENOMEM;
goto gpio_free;
@@ -446,7 +452,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
master->flags = master_flags;
master->bus_num = pdev->id;
- master->num_chipselect = SPI_N_CHIPSEL;
+ master->num_chipselect = num_devices;
master->setup = spi_gpio_setup;
master->cleanup = spi_gpio_cleanup;
#ifdef CONFIG_OF
@@ -461,9 +467,12 @@ static int spi_gpio_probe(struct platform_device *pdev)
* property of the node.
*/
- for (i = 0; i < SPI_N_CHIPSEL; i++)
- spi_gpio->cs_gpios[i] =
- of_get_named_gpio(np, "cs-gpios", i);
+ if (!SPI_N_CHIPSEL)
+ spi_gpio->cs_gpios[0] = SPI_GPIO_NO_CHIPSELECT;
+ else
+ for (i = 0; i < SPI_N_CHIPSEL; i++)
+ spi_gpio->cs_gpios[i] =
+ of_get_named_gpio(np, "cs-gpios", i);
}
#endif