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| author | Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> | 2012-11-23 13:44:39 +0100 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2012-12-17 17:11:32 +0000 |
| commit | 850a5b670af6293fcb1852af57567d19150ff638 (patch) | |
| tree | 929a247a47c6c4e58dcf77e5ca4b5490e46e0646 /drivers/spi | |
| parent | cb71941a682270dd5164d1332900694d19caa5e1 (diff) | |
| download | linux-stable-850a5b670af6293fcb1852af57567d19150ff638.tar.gz linux-stable-850a5b670af6293fcb1852af57567d19150ff638.tar.bz2 linux-stable-850a5b670af6293fcb1852af57567d19150ff638.zip | |
spi/atmel: add DT support
Use the newly introduce cs-gpios dt support on atmel.
We do not use the hardware cs as it's wired and has bugs and limitations.
As the controller believes that only active-low devices/systems exists.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-atmel.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c index 75c0c4f5fdf2..ab34497bcfee 100644 --- a/drivers/spi/spi-atmel.c +++ b/drivers/spi/spi-atmel.c @@ -20,6 +20,7 @@ #include <linux/spi/spi.h> #include <linux/slab.h> #include <linux/platform_data/atmel.h> +#include <linux/of.h> #include <asm/io.h> #include <asm/gpio.h> @@ -768,6 +769,10 @@ static int atmel_spi_setup(struct spi_device *spi) /* chipselect must have been muxed as GPIO (e.g. in board setup) */ npcs_pin = (unsigned int)spi->controller_data; + + if (gpio_is_valid(spi->cs_gpio)) + npcs_pin = spi->cs_gpio; + asd = spi->controller_state; if (!asd) { asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL); @@ -937,8 +942,9 @@ static int atmel_spi_probe(struct platform_device *pdev) /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->dev.of_node = pdev->dev.of_node; master->bus_num = pdev->id; - master->num_chipselect = 4; + master->num_chipselect = master->dev.of_node ? 0 : 4; master->setup = atmel_spi_setup; master->transfer = atmel_spi_transfer; master->cleanup = atmel_spi_cleanup; @@ -1064,11 +1070,20 @@ static int atmel_spi_resume(struct platform_device *pdev) #define atmel_spi_resume NULL #endif +#if defined(CONFIG_OF) +static const struct of_device_id atmel_spi_dt_ids[] = { + { .compatible = "atmel,at91rm9200-spi" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids); +#endif static struct platform_driver atmel_spi_driver = { .driver = { .name = "atmel_spi", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(atmel_spi_dt_ids), }, .suspend = atmel_spi_suspend, .resume = atmel_spi_resume, |